diff --git a/14-Queue/21-RightSideView/Makefile b/14-Queue/21-RightSideView/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..f5f5dddd980cdd835006e560a694720fd45b1052
--- /dev/null
+++ b/14-Queue/21-RightSideView/Makefile
@@ -0,0 +1,51 @@
+CC := g++ 
+ 
+#注意每行后面不要有空格，否则会算到目录名里面，导致问题
+SRC_DIR = ./
+BUILD_DIR = tmp
+OBJ_DIR = $(BUILD_DIR)/obj
+DEPS_DIR  = $(BUILD_DIR)/deps
+ 
+#这里添加其他头文件路径
+INC_DIR = \
+	-I./include \
+	-I./src \
+	
+#这里添加编译参数
+CC_FLAGS := $(INC_DIR) -g -std=c++11
+LNK_FLAGS := \
+	-L/usr/local/lib 
+ 
+#这里递归遍历3级子目录
+DIRS := $(shell find $(SRC_DIR) -maxdepth 3 -type d)
+ 
+#将每个子目录添加到搜索路径
+VPATH = $(DIRS)
+ 
+#查找src_dir下面包含子目录的所有cpp文件
+#SOURCES   = $(foreach dir, $(DIRS), $(wildcard $(dir)/*.cpp))  
+SOURCES   = RightSideView.cpp
+OBJS   = $(addprefix $(OBJ_DIR)/,$(patsubst %.cpp,%.o,$(notdir $(SOURCES))))  
+DEPS  = $(addprefix $(DEPS_DIR)/, $(patsubst %.cpp,%.d,$(notdir $(SOURCES))))  
+TARGET := $(patsubst %.cpp, %, $(SOURCES))
+
+
+$(TARGET):$(OBJS)
+	$(CC) $^ $(LNK_FLAGS) -o $@
+#编译之前要创建OBJ目录，确保目录存在
+$(OBJ_DIR)/%.o:%.cpp
+	if [ ! -d $(OBJ_DIR) ]; then mkdir -p $(OBJ_DIR); fi;\
+	$(CC) -c $(CC_FLAGS) -o $@ $<
+#编译之前要创建DEPS目录，确保目录存在
+#前面加@表示隐藏命令的执行打印
+$(DEPS_DIR)/%.d:%.cpp
+	@if [ ! -d $(DEPS_DIR) ]; then mkdir -p $(DEPS_DIR); fi;\
+	set -e; rm -f $@;\
+	$(CC) -MM $(CC_FLAGS) $< > $@.$$$$;\
+	sed 's,\($*\)\.o[ :]*,$(OBJ_DIR)/\1.o $@ : ,g' < $@.$$$$ > $@;\
+	rm -f $@.$$$$
+#前面加-表示忽略错误
+-include $(DEPS)
+.PHONY : clean
+clean:
+	rm -rf $(BUILD_DIR) $(TARGET)
diff --git a/14-Queue/21-RightSideView/RightSideView-leetcode.cpp b/14-Queue/21-RightSideView/RightSideView-leetcode.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..edd5e407275caeb008b76908590eb39d7a8681aa
--- /dev/null
+++ b/14-Queue/21-RightSideView/RightSideView-leetcode.cpp
@@ -0,0 +1,143 @@
+#include<iostream>
+#include<string>
+#include<string.h>
+#include<stack>
+#include<assert.h>
+#include<queue>
+#include<unordered_map>
+#include<algorithm>
+#include<sstream>
+
+using namespace std;
+
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode() : val(0), left(nullptr), right(nullptr) {}
+    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+};
+
+class Solution {
+public:
+    vector<int> rightSideView(TreeNode* root) {
+        if (root == nullptr) return {};
+        vector<int> res;
+        deque<TreeNode*> s;
+        s.push_back(root);
+        
+        while (!s.empty()) 
+        {
+            int n = s.size();
+            res.push_back(s.back()->val);
+            for (int i = 0; i < n; ++i) 
+            {
+                TreeNode* node = s.front(); s.pop_front();
+                if (node->left) s.push_back(node->left);
+                if (node->right) s.push_back(node->right);
+            }
+        }
+        return res;
+    }
+};
+
+void trimLeftTrailingSpaces(string &input) {
+    input.erase(input.begin(), find_if(input.begin(), input.end(), [](int ch) {
+        return !isspace(ch);
+    }));
+}
+
+void trimRightTrailingSpaces(string &input) {
+    input.erase(find_if(input.rbegin(), input.rend(), [](int ch) {
+        return !isspace(ch);
+    }).base(), input.end());
+}
+//举例:[1,2,3,null,5,null,4]
+TreeNode* stringToTreeNode(string input) {
+    trimLeftTrailingSpaces(input);
+    trimRightTrailingSpaces(input);
+    input = input.substr(1, input.length() - 2);//去掉[1,2,3,null,5,null,4]中的前面的[和最后的],变为:1,2,3,null,5,null,4;
+    if (!input.size()) {
+        return nullptr;
+    }
+
+    string item;
+    stringstream ss;
+    ss.str(input);
+
+    getline(ss, item, ',');                         //取出root对应的第一个字符'1'存入item；
+    cout << "item =" << item << endl;
+    TreeNode* root = new TreeNode(stoi(item));
+    queue<TreeNode*> nodeQueue;
+    nodeQueue.push(root);
+
+    while (true) {                                  //层次遍历创建二叉树
+        TreeNode* node = nodeQueue.front();
+        nodeQueue.pop();
+
+        if (!getline(ss, item, ',')) {              //读取左孩子的字符;
+            break;
+        }
+        //cout << "item =" << item << endl;
+        trimLeftTrailingSpaces(item);
+        if (item != "null") {
+            int leftNumber = stoi(item);
+            node->left = new TreeNode(leftNumber); //创建左孩子
+            nodeQueue.push(node->left);
+        }
+
+        if (!getline(ss, item, ',')) {             //读取右孩子的字符;
+            break;
+        }
+
+        trimLeftTrailingSpaces(item);
+        if (item != "null") {
+            int rightNumber = stoi(item);
+            node->right = new TreeNode(rightNumber); //创建右孩子
+            nodeQueue.push(node->right);
+        }
+    }
+    return root;
+}
+
+string integerVectorToString(vector<int> list, int length = -1) {
+    if (length == -1) {
+        length = list.size();
+    }
+
+    if (length == 0) {
+        return "[]";
+    }
+
+    string result;
+    for(int index = 0; index < length; index++) {
+        int number = list[index];
+        result += to_string(number) + ", ";
+    }
+    return "[" + result.substr(0, result.length() - 2) + "]";
+}
+
+int main() {
+    string line;
+    while (getline(cin, line)) {
+        TreeNode* root = stringToTreeNode(line);
+        
+        vector<int> ret = Solution().rightSideView(root);
+
+        string out = integerVectorToString(ret);
+        cout << out << endl;
+    }
+    return 0;
+}
diff --git a/14-Queue/21-RightSideView/RightSideView.cpp b/14-Queue/21-RightSideView/RightSideView.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4cb160cf48803618beb6c1c6595972a6e2b8b6e8
--- /dev/null
+++ b/14-Queue/21-RightSideView/RightSideView.cpp
@@ -0,0 +1,154 @@
+#include<iostream>
+#include<string>
+#include<string.h>
+#include<stack>
+#include<assert.h>
+#include<queue>
+#include<unordered_map>
+#include<algorithm>
+#include<sstream>
+
+using namespace std;
+
+/**
+ * Definition for a binary tree node.
+ * struct TreeNode {
+ *     int val;
+ *     TreeNode *left;
+ *     TreeNode *right;
+ *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+ *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+ * };
+ */
+struct TreeNode {
+    int val;
+    TreeNode *left;
+    TreeNode *right;
+    TreeNode() : val(0), left(nullptr), right(nullptr) {}
+    TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
+    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
+};
+
+class Solution {
+public:
+    vector<int> rightSideView(TreeNode* root) {
+	unordered_map<int, int> rightmostValueAtDepth;
+	int max_depth = -1;
+	queue<TreeNode*> nodeQueue;
+	queue<int> depthQueue;
+	nodeQueue.push(root);
+	depthQueue.push(0);
+
+	while(!nodeQueue.empty()) {
+	    TreeNode *node = nodeQueue.front();
+	    nodeQueue.pop();
+	    int depth = depthQueue.front();
+	    depthQueue.pop();
+
+	    if(node != nullptr) {
+	        max_depth = max(max_depth, depth);
+		rightmostValueAtDepth[depth] = node->val;
+
+		nodeQueue.push(node->left);
+		depthQueue.push(depth+1);
+		nodeQueue.push(node->right);
+		depthQueue.push(depth+1);
+	    }
+	}
+	vector<int> rightView;
+	for(int depth = 0; depth <= max_depth; ++depth) {
+	    rightView.push_back(rightmostValueAtDepth[depth]);
+	}
+	return rightView;
+    }
+};
+
+void trimLeftTrailingSpaces(string &input) {
+    input.erase(input.begin(), find_if(input.begin(), input.end(), [](int ch) {
+        return !isspace(ch);
+    }));
+}
+
+void trimRightTrailingSpaces(string &input) {
+    input.erase(find_if(input.rbegin(), input.rend(), [](int ch) {
+        return !isspace(ch);
+    }).base(), input.end());
+}
+//举例:[1,2,3,null,5,null,4]
+TreeNode* stringToTreeNode(string input) {
+    trimLeftTrailingSpaces(input);
+    trimRightTrailingSpaces(input);
+    input = input.substr(1, input.length() - 2);//去掉[1,2,3,null,5,null,4]中的前面的[和最后的],变为:1,2,3,null,5,null,4;
+    if (!input.size()) {
+        return nullptr;
+    }
+
+    string item;
+    stringstream ss;
+    ss.str(input);
+
+    getline(ss, item, ',');                         //取出root对应的第一个字符'1'存入item；
+    cout << "item =" << item << endl;
+    TreeNode* root = new TreeNode(stoi(item));
+    queue<TreeNode*> nodeQueue;
+    nodeQueue.push(root);
+
+    while (true) {                                  //层次遍历创建二叉树
+        TreeNode* node = nodeQueue.front();
+        nodeQueue.pop();
+
+        if (!getline(ss, item, ',')) {              //读取左孩子的字符;
+            break;
+        }
+        //cout << "item =" << item << endl;
+        trimLeftTrailingSpaces(item);
+        if (item != "null") {
+            int leftNumber = stoi(item);
+            node->left = new TreeNode(leftNumber); //创建左孩子
+            nodeQueue.push(node->left);
+        }
+
+        if (!getline(ss, item, ',')) {             //读取右孩子的字符;
+            break;
+        }
+
+        trimLeftTrailingSpaces(item);
+        if (item != "null") {
+            int rightNumber = stoi(item);
+            node->right = new TreeNode(rightNumber); //创建右孩子
+            nodeQueue.push(node->right);
+        }
+    }
+    return root;
+}
+
+string integerVectorToString(vector<int> list, int length = -1) {
+    if (length == -1) {
+        length = list.size();
+    }
+
+    if (length == 0) {
+        return "[]";
+    }
+
+    string result;
+    for(int index = 0; index < length; index++) {
+        int number = list[index];
+        result += to_string(number) + ", ";
+    }
+    return "[" + result.substr(0, result.length() - 2) + "]";
+}
+
+int main() {
+    string line;
+    while (getline(cin, line)) {
+        TreeNode* root = stringToTreeNode(line);
+        
+        vector<int> ret = Solution().rightSideView(root);
+
+        string out = integerVectorToString(ret);
+        cout << out << endl;
+    }
+    return 0;
+}