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Commitd989622

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‎README.md‎

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*[算法分析中的空间复杂度,你真的会了么?](https://mp.weixin.qq.com/s/sXjjnOUEQ4Gf5F9QCRzy7g)
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*[刷leetcode的时候,究竟什么时候可以使用库函数,什么时候不要使用库函数,过来人来说一说](https://leetcode-cn.com/circle/article/E1Kjzn/)
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* 数组
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*[必须掌握的数组理论知识](https://mp.weixin.qq.com/s/X7R55wSENyY62le0Fiawsg)
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*[数组:每次遇到二分法,都是一看就会,一写就废](https://mp.weixin.qq.com/s/fCf5QbPDtE6SSlZ1yh_q8Q)
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*[数组:就移除个元素很难么?](https://mp.weixin.qq.com/s/wj0T-Xs88_FHJFwayElQlA)
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*[数组:滑动窗口拯救了你](https://mp.weixin.qq.com/s/UrZynlqi4QpyLlLhBPglyg)
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*[数组:这个循环可以转懵很多人!](https://mp.weixin.qq.com/s/KTPhaeqxbMK9CxHUUgFDmg)
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*[数组:总结篇](https://mp.weixin.qq.com/s/LIfQFRJBH5ENTZpvixHEmg)
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* 链表
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*[关于链表,你该了解这些!](https://mp.weixin.qq.com/s/ntlZbEdKgnFQKZkSUAOSpQ)
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*[链表:听说用虚拟头节点会方便很多?](https://mp.weixin.qq.com/s/slM1CH5Ew9XzK93YOQYSjA)
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*[哈希表:解决了两数之和,那么能解决三数之和么?](https://mp.weixin.qq.com/s/r5cgZFu0tv4grBAexdcd8A)
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*[双指针法:一样的道理,能解决四数之和](https://mp.weixin.qq.com/s/nQrcco8AZJV1pAOVjeIU_g)
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* 数组
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*[必须掌握的数组理论知识](https://mp.weixin.qq.com/s/X7R55wSENyY62le0Fiawsg)
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*[数组:每次遇到二分法,都是一看就会,一写就废](https://mp.weixin.qq.com/s/fCf5QbPDtE6SSlZ1yh_q8Q)
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*[数组:就移除个元素很难么?](https://mp.weixin.qq.com/s/wj0T-Xs88_FHJFwayElQlA)
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*[数组:滑动窗口拯救了你](https://mp.weixin.qq.com/s/UrZynlqi4QpyLlLhBPglyg)
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*[数组:这个循环可以转懵很多人!](https://mp.weixin.qq.com/s/KTPhaeqxbMK9CxHUUgFDmg)
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*[数组:总结篇](https://mp.weixin.qq.com/s/LIfQFRJBH5ENTZpvixHEmg)
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* 字符串
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*[字符串:这道题目,使用库函数一行代码搞定](https://mp.weixin.qq.com/s/X02S61WCYiCEhaik6VUpFA)
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*[二叉树:递归函数究竟什么时候需要返回值,什么时候不要返回值?](https://mp.weixin.qq.com/s/6TWAVjxQ34kVqROWgcRFOg)
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*[二叉树:构造二叉树登场!](https://mp.weixin.qq.com/s/7r66ap2s-shvVvlZxo59xg)
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*[二叉树:构造一棵最大的二叉树](https://mp.weixin.qq.com/s/1iWJV6Aov23A7xCF4nV88w)
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*[本周小结!(二叉树系列三)](https://mp.weixin.qq.com/s/JLLpx3a_8jurXcz6ovgxtg)
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*[二叉树:合并两个二叉树](https://mp.weixin.qq.com/s/3f5fbjOFaOX_4MXzZ97LsQ)
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*[二叉树:二叉搜索树登场!](https://mp.weixin.qq.com/s/vsKrWRlETxCVsiRr8v_hHg)
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|[0018.四数之和](https://github.com/youngyangyang04/leetcode/blob/master/problems/0018.四数之和.md)| 数组|中等|**双指针**|
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|[0020.有效的括号](https://github.com/youngyangyang04/leetcode/blob/master/problems/0020.有效的括号.md)||简单|****|
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|[0021.合并两个有序链表](https://github.com/youngyangyang04/leetcode/blob/master/problems/0021.合并两个有序链表.md)|链表|简单|**模拟**|
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|[0024.两两交换链表中的节点](https://github.com/youngyangyang04/leetcode/blob/master/problems/0024.两两交换链表中的节点.md)|链表|中等|**模拟**|
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|[0026.删除排序数组中的重复项](https://github.com/youngyangyang04/leetcode/blob/master/problems/0026.删除排序数组中的重复项.md)|数组|简单|**暴力****快慢指针/快慢指针**|
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|[0027.移除元素](https://github.com/youngyangyang04/leetcode/blob/master/problems/0027.移除元素.md)|数组|简单|**暴力****双指针/快慢指针/双指针**|
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|[0028.实现strStr()](https://github.com/youngyangyang04/leetcode/blob/master/problems/0028.实现strStr().md)|字符串|简单|**KMP**|
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|[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**|
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|[0707.设计链表](https://github.com/youngyangyang04/leetcode/blob/master/problems/0707.设计链表.md)|链表|中等|**模拟**|
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|[0841.钥匙和房间](https://github.com/youngyangyang04/leetcode/blob/master/problems/0841.钥匙和房间.md)|孤岛问题|中等|**bfs****dfs**|
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|[1047.删除字符串中的所有相邻重复项](https://github.com/youngyangyang04/leetcode/blob/master/problems/1047.删除字符串中的所有相邻重复项.md)||简单|****|
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|[1002.查找常用字符](https://github.com/youngyangyang04/leetcode/blob/master/problems/1002.查找常用字符.md)||简单|****|
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|[1047.删除字符串中的所有相邻重复项](https://github.com/youngyangyang04/leetcode/blob/master/problems/1047.删除字符串中的所有相邻重复项.md)|哈希表|简单|**哈希表/数组**|
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|[剑指Offer05.替换空格](https://github.com/youngyangyang04/leetcode/blob/master/problems/剑指Offer05.替换空格.md)|字符串|简单|**双指针**|
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|[ 剑指Offer58-I.翻转单词顺序](https://github.com/youngyangyang04/leetcode/blob/master/problems/剑指Offer05.替换空格.md)|字符串|简单|**模拟/双指针**|
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|[剑指Offer58-II.左旋转字符串](https://github.com/youngyangyang04/leetcode/blob/master/problems/剑指Offer58-II.左旋转字符串.md)|字符串|简单|**反转操作**|

‎pics/1002.查找常用字符.png‎

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‎pics/42.接雨水4.png‎

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‎pics/98.验证二叉搜索树.png‎

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‎problems/0015.三数之和.md‎

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#思路
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**注意[0, 0, 0, 0] 这组数据**
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##哈希解法
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两层for循环就可以确定 a 和b 的数值了,可以使用哈希法来确定 0-(a+b) 是否在 数组里出现过,其实这个思路是正确的,但是我们有一个非常棘手的问题,就是题目中说的不可以包含重复的三元组。

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