Update README.md

哈希表

Author: sisterAn

README.md

@@ -71,6 +71,11 @@
 - [字节&leetcode151：翻转字符串里的单词](https://github.com/sisterAn/JavaScript-Algorithms/issues/18)
 - [字节&Leetcode3：无重复字符的最长子串](https://github.com/sisterAn/JavaScript-Algorithms/issues/21)
 
+#### 哈希表
+- [腾讯&leetcode349：给定两个数组，编写一个函数来计算它们的交集](https://github.com/sisterAn/JavaScript-Algorithms/issues/6)
+- [字节&leetcode1：两数之和](https://github.com/sisterAn/JavaScript-Algorithms/issues/4)
+- [腾讯&leetcode15：三数之和](https://github.com/sisterAn/JavaScript-Algorithms/issues/31)
+
 #### 树
 - [字节&leetcode144：二叉树的前序遍历](https://github.com/sisterAn/JavaScript-Algorithms/issues/37)
 - [字节&leetcode94：二叉树的中序遍历](https://github.com/sisterAn/JavaScript-Algorithms/issues/38)