前缀和 算法不懂看这个链接 https://mp.weixin.qq.com/s?__biz=Mzg3Mzc0NjUzMQ==&mid=2247497090&idx=1&sn=417f4d570deb4d116dabb9a473ebdf7a&source=41#wechat_redirect
单调栈 算法不懂看这个链接 https://mp.weixin.qq.com/s?__biz=Mzg3Mzc0NjUzMQ==&mid=2247497088&idx=1&sn=35e4f21d431d3c6ff91c2d6b62451339&source=41#wechat_redirect
滑动窗口 算法不懂看这个链接 https://www.cnblogs.com/huansky/p/13488234.html
双指针 算法不懂看这个链接 https://mp.weixin.qq.com/s?__biz=Mzg3Mzc0NjUzMQ==&mid=2247497066&idx=1&sn=1b62c9b5305576a06208b1a2202c9ea7&source=41#wechat_redirect
二分 https://leetcode.cn/leetbook/read/binary-search/x6q6fi/

BFS 算法不懂看这个链接 添加链接描述
DFS 算法不懂看这个链接 https://www.bilibili.com/video/BV1P5411N7Xc

设计地铁系统 https://leetcode-cn.com/problems/design-underground-system/
设计一个验证系统 https://leetcode-cn.com/problems/design-authentication-manager/
座位预约管理系统 https://leetcode-cn.com/problems/seat-reservation-manager/
设计推特 https://leetcode-cn.com/problems/design-twitter/
租房信息查询系统 http://3ms.huawei.com/km/groups/3803117/blogs/details/10397189?l=zh-cn

字符串、排序
http://oj.rnd.huawei.com/problems/374/submissions
http://oj.rnd.huawei.com/problems/1904/details
https://leetcode-cn.com/problems/bianry-number-to-string-lcci/
https://leetcode-cn.com/problems/longest-palindromic-substring/
https://leetcode-cn.com/problems/restore-ip-addresses/
https://leetcode-cn.com/problems/basic-calculator-ii/

链表、队列、哈希
http://oj.rnd.huawei.com/problems/395/details
http://oj.rnd.huawei.com/problems/282/details
https://leetcode-cn.com/problems/fu-za-lian-biao-de-fu-zhi-lcof/
https://leetcode-cn.com/problems/top-k-frequent-words/
https://leetcode-cn.com/problems/find-the-most-competitive-subsequence/
https://leetcode-cn.com/problems/swapping-nodes-in-a-linked-list/

栈、单调栈：
https://leetcode-cn.com/problems/decode-string/
https://leetcode-cn.com/problems/daily-temperatures/solution/
https://leetcode-cn.com/problems/smallest-subsequence-of-distinct-characters/
https://leetcode-cn.com/problems/number-of-islands/
https://leetcode-cn.com/problems/redundant-connection/
https://leetcode-cn.com/problems/minimum-size-subarray-sum/

递归
https://leetcode-cn.com/problems/swap-nodes-in-pairs/
https://leetcode-cn.com/problems/binary-tree-preorder-traversal/
https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/
https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/
https://leetcode-cn.com/problems/longest-substring-with-at-least-k-repeating-characters/
https://leetcode-cn.com/problems/partition-to-k-equal-sum-subsets/

树、二叉树
https://leetcode-cn.com/problems/maximum-width-of-binary-tree/
https://leetcode-cn.com/problems/reorder-routes-to-make-all-paths-lead-to-the-city-zero/
https://leetcode-cn.com/problems/binary-tree-level-order-traversal/
https://leetcode-cn.com/problems/maximum-difference-between-node-and-ancestor/
https://oj.rnd.huawei.com/problems/326/details
https://oj.rnd.huawei.com/problems/216/details

BFS、DFS：
https://leetcode-cn.com/problems/flatten-binary-tree-to-linked-list/solution/
https://leetcode-cn.com/problems/course-schedule/solution/
https://leetcode-cn.com/problems/perfect-squares/
https://leetcode-cn.com/problems/course-schedule/
https://oj.rnd.huawei.com/problems/387/details
https://oj.rnd.huawei.com/problems/1905/details

贪心和动态规划：
https://oj.rnd.huawei.com/problems/290/details
https://leetcode-cn.com/problems/task-scheduler/
https://leetcode-cn.com/problems/house-robber/
https://leetcode-cn.com/problems/boats-to-save-people/
https://leetcode-cn.com/problems/house-robber-iii/
http://oj.rnd.huawei.com/problems/221/details