From 0cf939f0baab6d0adb0d402c963616f474cb4e3d Mon Sep 17 00:00:00 2001
From: youngyangyang04 <826123027@qq.com>
Date: Fri, 22 Jan 2021 15:59:30 +0800
Subject: [PATCH] Update

---
 README.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index d653279a..e3948594 100644
--- a/README.md
+++ b/README.md
@@ -235,10 +235,10 @@
 * [回溯算法：排列问题（二）](https://mp.weixin.qq.com/s/9L8h3WqRP_h8LLWNT34YlA)
 * [本周小结！（回溯算法系列三）](https://mp.weixin.qq.com/s/tLkt9PSo42X60w8i94ViiA)
 * [本周小结！（回溯算法系列三）续集](https://mp.weixin.qq.com/s/kSMGHc_YpsqL2j-jb_E_Ag)
-* [视频来了！！带你学透回溯算法（理论篇）](https://mp.weixin.qq.com/s/wDd5azGIYWjbU0fdua_qBg)
-* [视频来了！！回溯算法：组合问题](https://mp.weixin.qq.com/s/a_r5JR93K_rBKSFplPGNAA)
-* [视频来了！！回溯算法：组合问题的剪枝操作](https://mp.weixin.qq.com/s/CK0kj9lq8-rFajxL4amyEg)
-* [视频来了！！回溯算法：组合总和](https://mp.weixin.qq.com/s/4M4Cr04uFOWosRMc_5--gg)
+* [视频来了！！带你学透回溯算法（理论篇）](https://www.bilibili.com/video/BV1cy4y167mM)
+* [视频来了！！回溯算法（力扣题目：77.组合）](https://www.bilibili.com/video/BV1ti4y1L7cv)
+* [视频来了！！回溯算法剪枝操作（力扣题目：77.组合）](https://www.bilibili.com/video/BV1wi4y157er)
+* [视频来了！！回溯算法（力扣题目：39.组合总和）](https://www.bilibili.com/video/BV1KT4y1M7HJ/)
 * [回溯算法：重新安排行程](https://mp.weixin.qq.com/s/3kmbS4qDsa6bkyxR92XCTA)
 * [回溯算法：N皇后问题](https://mp.weixin.qq.com/s/lU_QwCMj6g60nh8m98GAWg)
 * [回溯算法：解数独](https://mp.weixin.qq.com/s/eWE9TapVwm77yW9Q81xSZQ)