diff --git "a/exercises/huanhuilong/\344\270\255\347\255\211/\346\237\245\346\211\276\347\202\271\345\234\250\350\207\252\347\204\266\345\214\272\351\227\264\347\232\204\345\235\220\346\240\207/solution.cpp" "b/exercises/huanhuilong/\344\270\255\347\255\211/\346\237\245\346\211\276\347\202\271\345\234\250\350\207\252\347\204\266\345\214\272\351\227\264\347\232\204\345\235\220\346\240\207/solution.cpp"
index 0159b0967a245fec852757f3458680b9f93448e2..5e7f1e716916b276c48e297f9bd19cba68554da1 100644
--- "a/exercises/huanhuilong/\344\270\255\347\255\211/\346\237\245\346\211\276\347\202\271\345\234\250\350\207\252\347\204\266\345\214\272\351\227\264\347\232\204\345\235\220\346\240\207/solution.cpp"
+++ "b/exercises/huanhuilong/\344\270\255\347\255\211/\346\237\245\346\211\276\347\202\271\345\234\250\350\207\252\347\204\266\345\214\272\351\227\264\347\232\204\345\235\220\346\240\207/solution.cpp"
@@ -8,113 +8,113 @@
 class Range
 {
 public:
-	Range():m_pos(0), m_length(0){};
-	
-	Range(uint64_t pos, uint64_t length): m_pos(pos), m_length(length){}
-	
-	Range(Range const & rhs){
-		if (this == &rhs)
-			return;
-		m_pos = rhs.m_pos;
-		m_length = rhs.m_length;
-	}
-	Range& operator = (Range const & rhs){
-		if (this == &rhs)
-			return *this;
-		m_pos = rhs.m_pos;
-		m_length = rhs.m_length;
-		return *this;
-	}
-
-	~Range(){}
-
-	bool operator<(Range const & rhs) const{
+    Range():m_pos(0), m_length(0){};
+    
+    Range(uint64_t pos, uint64_t length): m_pos(pos), m_length(length){}
+    
+    Range(Range const & rhs){
+        if (this == &rhs)
+            return;
+        m_pos = rhs.m_pos;
+        m_length = rhs.m_length;
+    }
+    Range& operator = (Range const & rhs){
+        if (this == &rhs)
+            return *this;
+        m_pos = rhs.m_pos;
+        m_length = rhs.m_length;
+        return *this;
+    }
+
+    ~Range(){}
+
+    bool operator<(Range const & rhs) const{
         return m_pos < rhs.m_pos || (m_pos == rhs.m_pos && m_length < rhs.m_length);
     }
 
-	uint64_t GetPos() const {
+    uint64_t GetPos() const {
         return m_pos;
     }
 
-	uint64_t GetLength() const{
+    uint64_t GetLength() const{
         return m_length;
     }
 
-	uint64_t GetRight() const{
+    uint64_t GetRight() const{
         return m_pos+m_length;
     }
 
 public:
-	uint64_t m_pos;
-	uint64_t m_length;
+    uint64_t m_pos;
+    uint64_t m_length;
 };
 
 size_t findNatureRangeIndex(std::vector<Range>& rangeList, uint64_t point){
-	size_t n = rangeList.size();
-	size_t first = 0;
-	size_t last = 2 * n + 1;
-	size_t max = last;
-
-	uint64_t testBeg = 0;
-	uint64_t testEnd = 0;
-	size_t idx = SIZE_MAX;
-	while (first <= last) {
-		size_t mid = (first + last) / 2;  // compute mid point.
+    size_t n = rangeList.size();
+    size_t first = 0;
+    size_t last = 2 * n + 1;
+    size_t max = last;
+
+    uint64_t testBeg = 0;
+    uint64_t testEnd = 0;
+    size_t idx = SIZE_MAX;
+    while (first <= last) {
+        size_t mid = (first + last) / 2;  // compute mid point.
         std::cout<<"xx:"<<mid;
 
-		// 处理右边界
-		if (mid >= max - 1) {
-			uint64_t lastEnd = rangeList[n - 1].m_pos + rangeList[n - 1].m_length;
+        // 处理右边界
+        if (mid >= max - 1) {
+            uint64_t lastEnd = rangeList[n - 1].m_pos + rangeList[n - 1].m_length;
             std::cout<<"point:"<<point<<"lastEnd:"<<lastEnd<<"max:"<<max;
-			if (point>=lastEnd) {
-				idx = max - 1;
-			} else {
-				idx = max - 2;
-			}
-			break;
-		}
-
-		// 处理左边界
-		if (mid == 0) {
-			if (point >= rangeList[0].m_pos) {
-				idx = 1;
-			} else {
-				idx = 0;
-			}
-			break;
-		}
-
-		// 处理中间
-		bool even = mid % 2 == 0;
-		if (even) {
-			size_t left = (mid - 1) / 2;
-			size_t right = left + 1;
-			testBeg = rangeList[left].m_pos + rangeList[left].m_length;
-			testEnd = rangeList[right].m_pos;
-		} else {
-			size_t current = mid / 2;
-			testBeg = rangeList[current].m_pos;
-			testEnd = rangeList[current].m_pos + rangeList[current].m_length;
-		}
-
-		// 二分查找
+            if (point>=lastEnd) {
+                idx = max - 1;
+            } else {
+                idx = max - 2;
+            }
+            break;
+        }
+
+        // 处理左边界
+        if (mid == 0) {
+            if (point >= rangeList[0].m_pos) {
+                idx = 1;
+            } else {
+                idx = 0;
+            }
+            break;
+        }
+
+        // 处理中间
+        bool even = mid % 2 == 0;
+        if (even) {
+            size_t left = (mid - 1) / 2;
+            size_t right = left + 1;
+            testBeg = rangeList[left].m_pos + rangeList[left].m_length;
+            testEnd = rangeList[right].m_pos;
+        } else {
+            size_t current = mid / 2;
+            testBeg = rangeList[current].m_pos;
+            testEnd = rangeList[current].m_pos + rangeList[current].m_length;
+        }
+
+        // 二分查找
         
-		if (point>=testEnd) {
+        if (point>=testEnd) {
             std::cout<<"->"<<point<<","<<testBeg<<","<<testEnd<<std::endl;
-			first = mid + 1;       // repeat search in top half.
-		} else if (point<testBeg) {
+            first = mid + 1;       // repeat search in top half.
+        } else if (point<testBeg) {
             std::cout<<"<-"<<point<<","<<testBeg<<","<<testEnd<<std::endl;
-			last = mid - 1;        // repeat search in bottom half.
-		} else {
+            last = mid - 1;        // repeat search in bottom half.
+        } else {
             std::cout<<point<<","<<testBeg<<","<<testEnd<<std::endl;
-			idx = mid;
-			break;
-		}
-	}
+            idx = mid;
+            break;
+        }
+    }
 
     std::cout<<std::endl;
 
-	return idx;
+    return idx;
 }
 
 int main(int argc, char** argv){