Update and rename 1.md to Be a fresh man.md

添加双下标一遍扫描代码

Author: Longerhaha

2018.11.25-leetcode80/1.md

@@ -0,0 +1,20 @@
+```cpp
+class Solution {
+public:
+    //双下标一次遍历扫描
+    int maxArea(vector<int>& height) {
+        int height_len = height.size();
+        int start = 0;
+        int end = height_len - 1;
+        int max_area = 0;
+        while( start < end ){
+            max_area = max(max_area, min(height[start], height[end]) * (end - start));
+            //更新 start 和 end
+            if(height[start] < height[end])
+                start++;
+            else end--;
+        }
+        return max_area;
+    }
+};
+```