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* [关于时间复杂度，你不知道的都在这里！](https://mp.weixin.qq.com/s/LWBfehW1gMuEnXtQjJo-sw)
* [O(n)的算法居然超时了，此时的n究竟是多大？](https://mp.weixin.qq.com/s/73ryNsuPFvBQkt6BbhNzLA)
* [通过一道面试题目，讲一讲递归算法的时间复杂度！](https://mp.weixin.qq.com/s/I6ZXFbw09NR31F5CJR_geQ)
* [本周小结！（算法性能分析系列一）](https://mp.weixin.qq.com/s/5m8xDbGUeGgYJsESeg5ITQ)
* 数组
* [必须掌握的数组理论知识](https://mp.weixin.qq.com/s/X7R55wSENyY62le0Fiawsg)
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|[0454.四数相加II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0454.四数相加II.md) |哈希表 |中等| **哈希**|
|[0455.分发饼干](https://github.com/youngyangyang04/leetcode/blob/master/problems/0455.分发饼干.md) |贪心 |简单| **贪心**|
|[0459.重复的子字符串](https://github.com/youngyangyang04/leetcode/blob/master/problems/0459.重复的子字符串.md) |字符创 |简单| **KMP**|
|[0473.火柴拼正方形](https://github.com/youngyangyang04/leetcode/blob/master/problems/0473.火柴拼正方形.md) |深度优先搜索|中等| **回溯算法** 和698.划分为k个相等的子集差不多|
|[0474.一和零](https://github.com/youngyangyang04/leetcode/blob/master/problems/0474.一和零.md) |动态规划 |中等| **多重背包** 好题目|
|[0486.预测赢家](https://github.com/youngyangyang04/leetcode/blob/master/problems/0486.预测赢家.md) |动态规划 |中等| **递归** **记忆递归** **动态规划**|
|[0491.递增子序列](https://github.com/youngyangyang04/leetcode/blob/master/problems/0491.递增子序列.md) |深度优先搜索 |中等|**深度优先搜索/回溯算法** 这个去重有意思|
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|[0590.N叉树的后序遍历](https://github.com/youngyangyang04/leetcode/blob/master/problems/0590.N叉树的后序遍历.md) |N叉树 |简单|**递归** **栈/迭代**|
|[0617.合并二叉树](https://github.com/youngyangyang04/leetcode/blob/master/problems/0617.合并二叉树.md) |树 |简单|**递归** **迭代**|
|[0637.二叉树的层平均值](https://github.com/youngyangyang04/leetcode/blob/master/problems/0637.二叉树的层平均值.md) |树 |简单|**广度优先搜索/队列**|
|[0649.Dota2参议院](https://github.com/youngyangyang04/leetcode/blob/master/problems/0649.Dota2参议院.md) |贪心 |简单|**贪心算法** 简单的贪心策略但代码实现很有技巧|
|[0654.最大二叉树](https://github.com/youngyangyang04/leetcode/blob/master/problems/0654.最大二叉树.md) |树 |中等|**递归**|
|[0685.冗余连接II](https://github.com/youngyangyang04/leetcode/blob/master/problems/0685.冗余连接II.md) | 并查集/树/图 |困难|**并查集**|
|[0669.修剪二叉搜索树](https://github.com/youngyangyang04/leetcode/blob/master/problems/0669.修剪二叉搜索树.md) | 二叉搜索树/二叉树 |简单|**递归** **迭代**|
|[0698.划分为k个相等的子集](https://github.com/youngyangyang04/leetcode/blob/master/problems/0698.划分为k个相等的子集.md) |回溯算法|中等|动态规划 **回溯算法** 这其实是组合问题，使用了两次递归，好题|
|[0700.二叉搜索树中的搜索](https://github.com/youngyangyang04/leetcode/blob/master/problems/0700.二叉搜索树中的搜索.md) |二叉搜索树 |简单|**递归** **迭代**|
|[0701.二叉搜索树中的插入操作](https://github.com/youngyangyang04/leetcode/blob/master/problems/0701.二叉搜索树中的插入操作.md) |二叉搜索树 |简单|**递归** **迭代**|
|[0705.设计哈希集合](https://github.com/youngyangyang04/leetcode/blob/master/problems/0705.设计哈希集合.md) |哈希表 |简单|**模拟**|