From f32b33b7eac2c0381508bca61259dd920bbed3e7 Mon Sep 17 00:00:00 2001
From: ShusenTang <tangshusen@pku.edu.cn>
Date: Wed, 17 Jun 2020 09:23:52 +0800
Subject: [PATCH] fix 3sum url error

---
 solutions/18. 4Sum.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/solutions/18. 4Sum.md b/solutions/18. 4Sum.md
index dd38ac9..c15fde1 100644
--- a/solutions/18. 4Sum.md	
+++ b/solutions/18. 4Sum.md	
@@ -1,6 +1,6 @@
 # [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)