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fix 3sum url error

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ShusenTang 2020-06-17 09:23:52 +08:00 committed by GitHub
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solutions/18. 4Sum.md
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# [18. 4Sum](https://leetcode.com/problems/4sum/)
# 思路
和[3sum](https://github.com/ShusenTang/LeetCode/blob/master/15.%203Sum.md)这题基本一样的，注意这题由于循环层数比较多所以如果能
和[3sum](./15.%203Sum.md)这题基本一样的，注意这题由于循环层数比较多所以如果能
在外层循环判断一下的话可以提前终止循环或跳过某次循环，见代码。
时间复杂度O(n^3)