From 4b5e2d8b8098f7ae02248515a124390265c3823c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=A7=BB=E5=8A=A8=E5=BC=80=E5=8F=91=E5=B0=8F=E5=86=89?=
 <510495266@qq.com>
Date: Fri, 5 Nov 2021 13:12:46 +0800
Subject: [PATCH] Update README.md

---
 9 Algorithms Job Interview/README.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/9 Algorithms Job Interview/README.md b/9 Algorithms Job Interview/README.md
index 6fa298e..08a9ad1 100644
--- a/9 Algorithms Job Interview/README.md	
+++ b/9 Algorithms Job Interview/README.md	
@@ -15,6 +15,7 @@
 * 子串  
 
  
+数组，字符串问题常用解题套路：二分查找、 快慢指针、 左右指针、 滑动窗口、 前缀和数组、 差分数组。
 
 ## [链表](2%20链表.md)
 
@@ -60,12 +61,13 @@
 
 ## [二叉树](7%20二叉树.md)
 
+常见问题
 
 * 遍历
 * 翻转
 * 子树
 
-
+解题思路：递归
 
 ## [图](8%20图.md)