https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/
https://leetcode-cn.com/problems/3sum/
https://leetcode-cn.com/problems/3sum-closest/
https://leetcode-cn.com/problems/4sum/
这里四个数的就循环前两个数后两个数双指针,五个数就循环前三个数,后两个数双指针...如果n个数就动态规划
<快慢指针> 2022.4.6 环形链表 II https://leetcode-cn.com/problems/linked-list-cycle-ii/
<快慢指针> 2022.4.7 寻找重复数 https://leetcode-cn.com/problems/find-the-duplicate-number/
2022.4.25 9 周赛.统计包含每个点的矩形数目 https://leetcode-cn.com/problems/count-number-of-rectangles-containing-each-point/
2022.5.7 7 剑指Offer:字符流中第一个只出现一次的字符 https://www.acwing.com/activity/content/problem/content/259/
2022.5.12 7 剑指57II.和为s的连续正数序列 https://leetcode.cn/problems/he-wei-sde-lian-xu-zheng-shu-xu-lie-lcof/
2022.7.15 8 301周赛移动片段得到字符串 https://leetcode.cn/problems/move-pieces-to-obtain-a-string/
2022.10.19 7 315周赛.统计定界子数组的数目 https://leetcode.cn/problems/count-subarrays-with-fixed-bounds/