From f0bdb8f8f19d5907f8c725701f74bf771b6504b2 Mon Sep 17 00:00:00 2001
From: yangsm <yangsm@csdn.net>
Date: Wed, 8 Feb 2023 11:49:46 +0800
Subject: [PATCH] add exercises

---
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    1 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |    1 +
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |    1 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |    1 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    1 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |    1 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |    1 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |    1 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |    1 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |    1 +
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    6 +
 .../test_cases/1.out"                         |    3 +
 .../test_cases/10.in"                         | 2001 ++++
 .../test_cases/10.out"                        | 8001 +++++++++++++++
 .../test_cases/2.in"                          |    7 +
 .../test_cases/2.out"                         |    4 +
 .../test_cases/3.in"                          |   11 +
 .../test_cases/3.out"                         |    5 +
 .../test_cases/4.in"                          |   21 +
 .../test_cases/4.out"                         |    2 +
 .../test_cases/5.in"                          |   10 +
 .../test_cases/5.out"                         |    2 +
 .../test_cases/6.in"                          |  101 +
 .../test_cases/6.out"                         |   13 +
 .../test_cases/7.in"                          | 1001 ++
 .../test_cases/7.out"                         |  157 +
 .../test_cases/8.in"                          | 1001 ++
 .../test_cases/8.out"                         | 9001 +++++++++++++++++
 .../test_cases/9.in"                          | 2001 ++++
 .../test_cases/9.out"                         | 8002 +++++++++++++++
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    1 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |    1 +
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |    1 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |    1 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    1 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |    1 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |    1 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |    1 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |    1 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |    1 +
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |  738 ++
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |  715 ++
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |  231 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |  452 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |  448 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |   50 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |  490 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |  196 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |  690 ++
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |  241 +
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    6 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         | 1001 ++
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          | 1001 ++
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |   11 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    6 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |   11 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |   11 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |  101 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |  101 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          | 1001 ++
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    2 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |    2 +
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |    2 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |    2 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    2 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |    2 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |    2 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |    2 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |    2 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |    2 +
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |    1 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |    1 +
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |    1 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |    1 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    1 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |    1 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |    1 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |    1 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |    1 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |    1 +
 .../test_cases/9.out"                         |    1 +
 .../exercies.md"                              |   18 +
 .../solution.c"                               |    0
 .../test_cases/1.in"                          |   15 +
 .../test_cases/1.out"                         |    1 +
 .../test_cases/10.in"                         |   39 +
 .../test_cases/10.out"                        |    1 +
 .../test_cases/2.in"                          |   21 +
 .../test_cases/2.out"                         |    1 +
 .../test_cases/3.in"                          |   15 +
 .../test_cases/3.out"                         |    1 +
 .../test_cases/4.in"                          |    9 +
 .../test_cases/4.out"                         |    1 +
 .../test_cases/5.in"                          |  175 +
 .../test_cases/5.out"                         |    1 +
 .../test_cases/6.in"                          |   61 +
 .../test_cases/6.out"                         |    1 +
 .../test_cases/7.in"                          |  167 +
 .../test_cases/7.out"                         |    1 +
 .../test_cases/8.in"                          |  159 +
 .../test_cases/8.out"                         |    1 +
 .../test_cases/9.in"                          |   77 +
 .../test_cases/9.out"                         |    1 +
 176 files changed, 39853 insertions(+)
 create mode 100644 "exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/exercies.md"
 create mode 100644 "exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/solution.c"
 create mode 100644 "exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.in"
 create mode 100644 "exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.out"
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 create mode 100644 "exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/exercies.md" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/solution.c" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.in"
new file mode 100644
index 0000000..bf0d87a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.in"
@@ -0,0 +1 @@
+4
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.out"
new file mode 100644
index 0000000..d7d17fc
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/1.out"
@@ -0,0 +1 @@
+-1
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.in"
new file mode 100644
index 0000000..56749c8
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.in"
@@ -0,0 +1 @@
+96
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.out"
new file mode 100644
index 0000000..3cacc0b
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/10.out"
@@ -0,0 +1 @@
+12
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.in"
new file mode 100644
index 0000000..2fb681e
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.in"
@@ -0,0 +1 @@
+71
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.out"
new file mode 100644
index 0000000..d7d17fc
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/2.out"
@@ -0,0 +1 @@
+-1
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.in"
new file mode 100644
index 0000000..9d1ce53
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.in"
@@ -0,0 +1 @@
+82
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.out"
new file mode 100644
index 0000000..9d60796
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/3.out"
@@ -0,0 +1 @@
+11
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.in"
new file mode 100644
index 0000000..9cd72aa
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.in"
@@ -0,0 +1 @@
+72
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.out"
new file mode 100644
index 0000000..f11c82a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/4.out"
@@ -0,0 +1 @@
+9
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.in"
new file mode 100644
index 0000000..dce6588
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.in"
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\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.out"
new file mode 100644
index 0000000..7813681
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/5.out"
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+5
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.in"
new file mode 100644
index 0000000..8580e7b
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.out"
new file mode 100644
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--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/6.out"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/7.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/7.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/7.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/7.out"
new file mode 100644
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.in"
new file mode 100644
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--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.out"
new file mode 100644
index 0000000..f11c82a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/8.out"
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.in" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.in"
new file mode 100644
index 0000000..8fdd954
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.in"
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.out" "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.out"
new file mode 100644
index 0000000..e440e5c
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\344\271\260\350\213\271\346\236\234/test_cases/9.out"
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/exercies.md" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/solution.c" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.in" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.in"
new file mode 100644
index 0000000..51a6dab
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.in"
@@ -0,0 +1,6 @@
+5 5
+1 2
+2 2
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.out" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.out"
new file mode 100644
index 0000000..f5f5b38
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/1.out"
@@ -0,0 +1,3 @@
+2
+1 2 3
+4 5
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.in" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.in"
new file mode 100644
index 0000000..9e295bf
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.out" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.out"
new file mode 100644
index 0000000..4205d6e
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/10.out"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/7.out" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/7.out"
new file mode 100644
index 0000000..fa887e4
--- /dev/null
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/8.in" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/8.in"
new file mode 100644
index 0000000..65f07d5
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/8.out" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/8.out"
new file mode 100644
index 0000000..ff29921
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/8.out"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.in" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.in"
new file mode 100644
index 0000000..1e4b500
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.out" "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.out"
new file mode 100644
index 0000000..6821910
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\345\244\251\347\204\266\346\260\224\350\256\242\345\215\225/test_cases/9.out"
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+10000
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/exercies.md" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/solution.c" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.in"
new file mode 100644
index 0000000..b4d713d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.in"
@@ -0,0 +1 @@
+24,12,2,3,6,14,8
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.out"
new file mode 100644
index 0000000..3cacc0b
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/1.out"
@@ -0,0 +1 @@
+12
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.in"
new file mode 100644
index 0000000..b20166b
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.in"
@@ -0,0 +1 @@
+9,7,7,7,14,12,10
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.out"
new file mode 100644
index 0000000..c793025
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/10.out"
@@ -0,0 +1 @@
+7
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.in"
new file mode 100644
index 0000000..c1e2bbf
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.in"
@@ -0,0 +1 @@
+10,8,7,5,4,12
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.out"
new file mode 100644
index 0000000..301160a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/2.out"
@@ -0,0 +1 @@
+8
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.in"
new file mode 100644
index 0000000..d0b78fd
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.in"
@@ -0,0 +1 @@
+3,8,8,6,4,7,14
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.out"
new file mode 100644
index 0000000..9d60796
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/3.out"
@@ -0,0 +1 @@
+11
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.in"
new file mode 100644
index 0000000..68a3aae
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.in"
@@ -0,0 +1 @@
+9,7,5,5,3,2,3,2
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.out"
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/4.out"
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.in"
new file mode 100644
index 0000000..07c4bec
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.in"
@@ -0,0 +1 @@
+8,18,17,7,9,12
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.out"
new file mode 100644
index 0000000..9a03714
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/5.out"
@@ -0,0 +1 @@
+10
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.in"
new file mode 100644
index 0000000..111f498
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.in"
@@ -0,0 +1 @@
+8,8,7,6,6,5
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.out"
new file mode 100644
index 0000000..c227083
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/6.out"
@@ -0,0 +1 @@
+0
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.in"
new file mode 100644
index 0000000..d163c64
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.in"
@@ -0,0 +1 @@
+7,18,17,15,14,21,23
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.out"
new file mode 100644
index 0000000..19c7bdb
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/7.out"
@@ -0,0 +1 @@
+16
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.in"
new file mode 100644
index 0000000..dc3c181
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.in"
@@ -0,0 +1 @@
+2,8,17,5,14,2,8,14,6
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.out"
new file mode 100644
index 0000000..3f10ffe
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/8.out"
@@ -0,0 +1 @@
+15
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.in" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.in"
new file mode 100644
index 0000000..aed7f37
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.in"
@@ -0,0 +1 @@
+6,8,9,7,14,12
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.out" "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.out"
new file mode 100644
index 0000000..301160a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\346\234\200\344\274\230\345\210\251\346\266\246\345\200\274/test_cases/9.out"
@@ -0,0 +1 @@
+8
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/exercies.md" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/solution.c" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.in"
new file mode 100644
index 0000000..d0ecee8
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.in"
@@ -0,0 +1,738 @@
+604 737
+210 44
+297 632
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+339 123
+254 498
+820 768
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+641 907
+564 364
+803 26
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+61 852
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+70 386
+636 725
+686 555
+245 711
+63 389
+328 911
+954 828
+386 998
+548 113
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.out"
new file mode 100644
index 0000000..06c4fff
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/1.out"
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+18771
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/10.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/10.in"
new file mode 100644
index 0000000..56e9014
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/10.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/2.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/2.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/2.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/2.out"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/3.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/3.out"
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index 0000000..b193f39
--- /dev/null
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/4.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/4.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/4.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/4.out"
new file mode 100644
index 0000000..b853b07
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/4.out"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/5.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/5.in"
new file mode 100644
index 0000000..c9a6575
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/5.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/5.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/5.out"
new file mode 100644
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/6.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/6.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/6.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/6.out"
new file mode 100644
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/7.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/7.in"
new file mode 100644
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/7.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/7.out"
new file mode 100644
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/8.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/8.out"
new file mode 100644
index 0000000..5077acd
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/8.out"
@@ -0,0 +1 @@
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.in" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.in"
new file mode 100644
index 0000000..c6bbf11
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.in"
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.out" "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.out"
new file mode 100644
index 0000000..240fb9a
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\347\210\261\345\220\203\351\254\274/test_cases/9.out"
@@ -0,0 +1 @@
+6954
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/exercies.md" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/solution.c" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.in" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.in"
new file mode 100644
index 0000000..00a1150
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.in"
@@ -0,0 +1,6 @@
+5 2 2
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diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.out" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.out"
new file mode 100644
index 0000000..25bf17f
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/1.out"
@@ -0,0 +1 @@
+18
\ No newline at end of file
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/10.in" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/10.in"
new file mode 100644
index 0000000..c7df86d
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/10.in"
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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+121 609
+397 586
+507 249
+803 254
+926 875
+515 768
+750 247
+995 589
+734 30
+640 280
+270 562
+416 344
+930 507
diff --git "a/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/9.out" "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/9.out"
new file mode 100644
index 0000000..0e149cf
--- /dev/null
+++ "b/exercises/csdn/\344\270\255\347\255\211/\350\277\220\350\276\223\347\237\263\346\262\271/test_cases/9.out"
@@ -0,0 +1 @@
+659556
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/exercies.md" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/solution.c" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.in"
new file mode 100644
index 0000000..0395e90
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.in"
@@ -0,0 +1,2 @@
+10 6 100
+17 5
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.out"
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/1.out"
@@ -0,0 +1 @@
+4
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.in"
new file mode 100644
index 0000000..76f0672
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.in"
@@ -0,0 +1,2 @@
+571 787 512
+82 310
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/10.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.in"
new file mode 100644
index 0000000..894b71a
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.in"
@@ -0,0 +1,2 @@
+11 6 100
+12 5
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.out"
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/2.out"
@@ -0,0 +1 @@
+2
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.in"
new file mode 100644
index 0000000..dfab073
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.in"
@@ -0,0 +1,2 @@
+25 27 91
+10 87
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/3.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.in"
new file mode 100644
index 0000000..b259c51
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.in"
@@ -0,0 +1,2 @@
+79 4 68
+9 65
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.out"
new file mode 100644
index 0000000..aabe6ec
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/4.out"
@@ -0,0 +1 @@
+21
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.in"
new file mode 100644
index 0000000..65fda45
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.in"
@@ -0,0 +1,2 @@
+792 698 30
+291 16
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/5.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.in"
new file mode 100644
index 0000000..7562fe5
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.in"
@@ -0,0 +1,2 @@
+855 314 101
+87 35
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/6.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.in"
new file mode 100644
index 0000000..fa81279
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.in"
@@ -0,0 +1,2 @@
+928 205 983
+217 700
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.out"
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/7.out"
@@ -0,0 +1 @@
+2
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.in"
new file mode 100644
index 0000000..56a3f83
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.in"
@@ -0,0 +1,2 @@
+663 562 977
+33 404
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/8.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.in" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.in"
new file mode 100644
index 0000000..4f0819e
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.in"
@@ -0,0 +1,2 @@
+688 273 150
+97 12
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.out" "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\344\274\240\345\245\207\351\234\270\344\270\232/test_cases/9.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/exercies.md" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/solution.c" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.in"
new file mode 100644
index 0000000..2faebf6
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.in"
@@ -0,0 +1 @@
+3 4 5 10 8 100 3 1
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.out"
new file mode 100644
index 0000000..0cfbf08
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/1.out"
@@ -0,0 +1 @@
+2
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.in"
new file mode 100644
index 0000000..9d7b302
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.in"
@@ -0,0 +1 @@
+1 4 5 5 3 10 3 1
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.out"
new file mode 100644
index 0000000..1e8b314
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/10.out"
@@ -0,0 +1 @@
+6
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.in"
new file mode 100644
index 0000000..dcdfc92
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.in"
@@ -0,0 +1 @@
+5 100 10 1 19 90 4 3
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.out"
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/2.out"
@@ -0,0 +1 @@
+3
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.in"
new file mode 100644
index 0000000..297ee22
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.in"
@@ -0,0 +1 @@
+10 1000 1000 25 23 1 50 1
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.out"
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/3.out"
@@ -0,0 +1 @@
+0
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.in"
new file mode 100644
index 0000000..c039a1d
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.in"
@@ -0,0 +1 @@
+1 7 4 5 5 8 3 2
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.out"
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/4.out"
@@ -0,0 +1 @@
+4
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.in"
new file mode 100644
index 0000000..fe5d93b
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.in"
@@ -0,0 +1 @@
+2 3 3 5 5 10 1 3
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/5.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.in"
new file mode 100644
index 0000000..2dea91c
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.in"
@@ -0,0 +1 @@
+2 6 4 5 6 5 1 3
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.out"
new file mode 100644
index 0000000..573541a
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/6.out"
@@ -0,0 +1 @@
+0
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.in"
new file mode 100644
index 0000000..15ffdf7
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.in"
@@ -0,0 +1 @@
+1 7 3 5 3 6 2 1
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.out"
new file mode 100644
index 0000000..1e8b314
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/7.out"
@@ -0,0 +1 @@
+6
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.in"
new file mode 100644
index 0000000..956887c
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.in"
@@ -0,0 +1 @@
+2 4 5 4 5 7 3 2
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.out"
new file mode 100644
index 0000000..d00491f
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/8.out"
@@ -0,0 +1 @@
+1
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.in" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.in"
new file mode 100644
index 0000000..18e0032
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.in"
@@ -0,0 +1 @@
+2 3 6 5 7 8 2 1
\ No newline at end of file
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.out" "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.out"
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\345\260\217Q\347\232\204\351\262\234\346\246\250\346\237\240\346\252\254\346\261\201/test_cases/9.out"
@@ -0,0 +1 @@
+4
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/exercies.md" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/exercies.md"
new file mode 100644
index 0000000..dd4157d
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/exercies.md"
@@ -0,0 +1,18 @@
+# 最后一位
+
+小明选择了一个正整数X,然后把它写在黑板上。然后每一天他会擦掉当前数字的最后一位,直到他擦掉所有数位。 在整个过程中,小明会把所有在黑板上出现过的数字记录下来,然后求出他们的总和sum. 例如X = 509, 在黑板上出现过的数字依次是509, 50, 5, 他们的和就是564. 小明现在给出一个sum,小明想让你求出一个正整数X经过上述过程的结果是sum.
+
+## 输入描述
+输入包括正整数sum(1 ≤ sum ≤ 10^18)
+
+## 输出描述
+输出一个正整数,即满足条件的X,如果没有这样的X,输出-1。
+
+## 输入样例
+564
+
+## 输出样例
+509
+
+## 提示
+无
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/solution.c" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/solution.c"
new file mode 100644
index 0000000..e69de29
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.in"
new file mode 100644
index 0000000..c641b64
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.in"
@@ -0,0 +1,15 @@
+7
+XL
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.out"
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/1.out"
@@ -0,0 +1 @@
+3
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.in"
new file mode 100644
index 0000000..5147945
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.in"
@@ -0,0 +1,39 @@
+19
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.out"
new file mode 100644
index 0000000..1e8b314
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/10.out"
@@ -0,0 +1 @@
+6
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.in"
new file mode 100644
index 0000000..7f94db5
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.in"
@@ -0,0 +1,21 @@
+10
+L
+XLLLL
+M
+XLL
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+S
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.out"
new file mode 100644
index 0000000..00750ed
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/2.out"
@@ -0,0 +1 @@
+3
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.in"
new file mode 100644
index 0000000..6c1b316
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.in"
@@ -0,0 +1,15 @@
+7
+XLLL
+XL
+XLLL
+XLLL
+L
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+L
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+S
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.out"
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/3.out"
@@ -0,0 +1 @@
+4
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.in"
new file mode 100644
index 0000000..aa13ff2
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.in"
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.out"
new file mode 100644
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--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/4.out"
@@ -0,0 +1 @@
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.in"
new file mode 100644
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--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.in"
@@ -0,0 +1,175 @@
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diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.out" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.out"
new file mode 100644
index 0000000..48082f7
--- /dev/null
+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/5.out"
@@ -0,0 +1 @@
+12
diff --git "a/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/6.in" "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/6.in"
new file mode 100644
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+++ "b/exercises/csdn/\347\256\200\345\215\225/\350\256\242\347\217\255\346\234\215/test_cases/6.in"
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-- 
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