lightfish-zhang
diff --git a/‎README.md
+1-1 b/‎README.md
+1-1
diff --git a/‎img/how-to-contribute-yanglbme.png
17.7 KB b/‎img/how-to-contribute-yanglbme.png
17.7 KB
diff --git a/‎solution/0069.Sqrt(x)/README.md
+24 b/‎solution/0069.Sqrt(x)/README.md
+24
diff --git a/‎solution/0069.sqrt-x/Solution.py renamed to ‎solution/0069.Sqrt(x)/Solution.py b/‎solution/0069.sqrt-x/Solution.py renamed to ‎solution/0069.Sqrt(x)/Solution.py
diff --git a/‎solution/0069.sqrt-x/Solution2.py renamed to ‎solution/0069.Sqrt(x)/Solution2.py b/‎solution/0069.sqrt-x/Solution2.py renamed to ‎solution/0069.Sqrt(x)/Solution2.py
@@ -120,7 +120,7 @@ I'm looking for long-term contributors/partners to this repo! Send me [PRs](http
 - Submit a pull request with your changes!
 - For more details, see [CONTRIBUTING.md](https://github.com/doocs/leetcode/blob/master/.github/CONTRIBUTING.md)
 
-![how-to-contribute](http://p9ucdlghd.bkt.clouddn.com/how-to-contribute-yanglbme.png)
+![how-to-contribute](/img/how-to-contribute-yanglbme.png)
 
 ## Contributors
 
 
@@ -0,0 +1,24 @@
+## x 的平方根
+### 题目描述
+
+实现 `int sqrt(int x)` 函数。
+
+计算并返回 x 的平方根，其中 x 是非负整数。
+
+由于返回类型是整数，结果只保留整数的部分，小数部分将被舍去。
+
+**示例 1:**
+```
+输入: 4
+输出: 2
+```
+
+**示例 2:**
+```
+输入: 8
+输出: 2
+说明: 8 的平方根是 2.82842..., 
+     由于返回类型是整数，小数部分将被舍去。
+```
+
+### 解法