规范格式

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# [76. Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
## 题目
Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n).
Example:
```c
Input: S = "ADOBECODEBANC", T = "ABC"
Output: "BANC"
```
Note:
- If there is no such window in S that covers all characters in T, return the empty string "".
- If there is such window, you are guaranteed that there will always be only one unique minimum window in S.
## 题目大意
给定一个源字符串 s再给一个字符串 T要求在源字符串中找到一个窗口这个窗口包含由字符串各种排列组合组成的窗口中可以包含 T 中没有的字符,如果存在多个,在结果中输出最小的窗口,如果找不到这样的窗口,输出空字符串。
## 解题思路
这一题是滑动窗口的题目,在窗口滑动的过程中不断的包含字符串 T直到完全包含字符串 T 的字符以后,记下左右窗口的位置和窗口大小。每次都不断更新这个符合条件的窗口和窗口大小的最小值。最后输出结果即可。