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feat: index for 11-40
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‎Index/DFS.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [17. 电话号码的字母组合](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/solution/shua-chuan-lc-dfs-hui-su-jie-fa-by-ac_oi-qa02/) | 中等 | 🤩🤩🤩🤩 |
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| [22. 括号生成](https://leetcode-cn.com/problems/generate-parentheses/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/generate-parentheses/solution/shua-chuan-lc-dfs-jie-fa-by-ac_oier-nknl/) | 中等 | 🤩🤩🤩🤩 |
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| [37. 解数独](https://leetcode-cn.com/problems/sudoku-solver/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/sudoku-solver/solution/he-n-huang-hou-yi-yang-shi-yi-dao-hui-su-lfpd/) | 困难 | 🤩🤩🤩🤩 |
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| [39. 组合总和](https://leetcode-cn.com/problems/combination-sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/combination-sum/solution/dfs-hui-su-suan-fa-yi-ji-ru-he-que-ding-wpbo5/) | 中等 | 🤩🤩🤩🤩 |
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| [40. 组合总和 II](https://leetcode-cn.com/problems/combination-sum-ii/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/combination-sum-ii/solution/dfs-hui-su-jie-fa-yi-ji-ru-he-pan-duan-s-xlwy/) | 中等 | 🤩🤩🤩🤩 |
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‎Index/n 数之和.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [15. 三数之和](https://leetcode-cn.com/problems/3sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/3sum/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-cd8r/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [16. 最接近的三数之和](https://leetcode-cn.com/problems/3sum-closest/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/3sum-closest/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-p2ou/) | 中等 | 🤩🤩🤩🤩 |
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| [18. 四数之和](https://leetcode-cn.com/problems/4sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/4sum/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-dqx7/) | 中等 | 🤩🤩🤩🤩 |
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‎Index/二分.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ---- | -------- |
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| [4. 寻找两个正序数组的中位数 ](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/) | [【刷穿 LC】朴素解法 + 分治解法](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/solution/shua-chuan-lc-po-su-jie-fa-fen-zhi-jie-f-wtu2/) | 困难 | 🤩🤩🤩🤩 |
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| [4. 寻找两个正序数组的中位数 ](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/solution/shua-chuan-lc-po-su-jie-fa-fen-zhi-jie-f-wtu2/) | 困难 | 🤩🤩🤩🤩 |
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| [29. 两数相除](https://leetcode-cn.com/problems/divide-two-integers/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/divide-two-integers/solution/shua-chuan-lc-er-fen-bei-zeng-cheng-fa-j-m73b) | 中等 | 🤩🤩🤩 |
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| [33. 搜索旋转排序数组](https://leetcode-cn.com/problems/search-in-rotated-sorted-array/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/search-in-rotated-sorted-array/solution/shua-chuan-lc-yan-ge-ologn100yi-qi-kan-q-xifo/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [34. 在排序数组中查找元素的第一个和最后一个位置](https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array/solution/sha-sha-gao-bu-qing-ru-he-ding-yi-er-fen-rrj1/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [35. 搜索插入位置](https://leetcode-cn.com/problems/search-insert-position/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/search-insert-position/solution/shua-chuan-lc-jian-dan-mo-ni-ti-by-ac_oi-7d5t/) | 简单 | 🤩🤩🤩🤩🤩 |
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‎Index/分治.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ | ---- | -------- |
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| [4. 寻找两个正序数组的中位数 ](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/) | [【刷穿 LC】朴素解法 + 分治解法](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/solution/shua-chuan-lc-po-su-jie-fa-fen-zhi-jie-f-wtu2/) | 困难 | 🤩🤩🤩🤩 |
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| [4. 寻找两个正序数组的中位数 ](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/median-of-two-sorted-arrays/solution/shua-chuan-lc-po-su-jie-fa-fen-zhi-jie-f-wtu2/) | 困难 | 🤩🤩🤩🤩 |
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‎Index/双指针.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---------- |
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| [3. 无重复字符的最长子串 ](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/) | [【刷穿 LC】双指针 + 哈希表解法](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution/shua-chuan-lc-shuang-zhi-zhen-ha-xi-biao-q08m/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [3. 无重复字符的最长子串 ](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution/shua-chuan-lc-shuang-zhi-zhen-ha-xi-biao-q08m/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [11. 盛最多水的容器 ](https://leetcode-cn.com/problems/container-with-most-water/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [15. 三数之和](https://leetcode-cn.com/problems/3sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/3sum/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-cd8r/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [16. 最接近的三数之和](https://leetcode-cn.com/problems/3sum-closest/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/3sum-closest/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-p2ou/) | 中等 | 🤩🤩🤩🤩 |
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| [18. 四数之和](https://leetcode-cn.com/problems/4sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/4sum/solution/shua-chuan-lc-pai-xu-shuang-zhi-zhen-jie-dqx7/) | 中等 | 🤩🤩🤩🤩 |
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| [19. 删除链表的倒数第 N 个结点](https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/solution/shua-chuan-lc-lian-biao-kuai-man-zhi-zhe-1gs1/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [26. 删除有序数组中的重复项](https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/solution/shua-chuan-lc-jian-ji-shuang-zhi-zhen-ji-2eg8) | 简单 | 🤩🤩🤩🤩 |
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| [27. 移除元素](https://leetcode-cn.com/problems/remove-element/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/remove-element/solution/shua-chuan-lc-shuang-bai-shuang-zhi-zhen-mzt8/) | 简单 | 🤩🤩🤩🤩 |
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‎Index/哈希表.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---------- |
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| [1. 两数之和](https://leetcode-cn.com/problems/two-sum/) | [【宫水三叶】朴素解法 + 哈希表解法](https://leetcode-cn.com/problems/two-sum/solution/po-su-jie-fa-ha-xi-biao-jie-fa-by-ac_oie-yf7o/) | 简单 | 🤩🤩🤩🤩🤩 |
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| [2. 两数相加](https://leetcode-cn.com/problems/add-two-numbers/) | [朴素解法（哨兵技巧）](https://leetcode-cn.com/problems/add-two-numbers/solution/po-su-jie-fa-shao-bing-ji-qiao-by-ac_oie-etln/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [3. 无重复字符的最长子串 ](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/) | [【刷穿 LC】双指针 + 哈希表解法](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution/shua-chuan-lc-shuang-zhi-zhen-ha-xi-biao-q08m/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [1. 两数之和](https://leetcode-cn.com/problems/two-sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/two-sum/solution/po-su-jie-fa-ha-xi-biao-jie-fa-by-ac_oie-yf7o/) | 简单 | 🤩🤩🤩🤩🤩 |
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| [2. 两数相加](https://leetcode-cn.com/problems/add-two-numbers/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/add-two-numbers/solution/po-su-jie-fa-shao-bing-ji-qiao-by-ac_oie-etln/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [3. 无重复字符的最长子串 ](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution/shua-chuan-lc-shuang-zhi-zhen-ha-xi-biao-q08m/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [13. 罗马数字转整数](https://leetcode-cn.com/problems/roman-to-integer/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/roman-to-integer/solution/shua-chuan-lc-ha-xi-biao-by-ac_oier-mooy/) | 简单 | 🤩🤩 |
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| [30. 串联所有单词的子串](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words/solution/shua-chuan-lc-po-su-ha-xi-biao-jie-fa-hu-ml3x/) | 困难 | 🤩🤩 |
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| [36. 有效的数独](https://leetcode-cn.com/problems/valid-sudoku/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/valid-sudoku/solution/ha-xi-biao-jie-fa-shu-zu-jie-fa-by-ac_oi-feac/) | 中等 | 🤩🤩🤩🤩 |
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‎Index/回文串问题.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ---------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---------- |
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| [5. 最长回文子串](https://leetcode-cn.com/problems/longest-palindromic-substring/) | [【必背模板】回文串问题的究极答案：Manacher 算法](https://leetcode-cn.com/problems/longest-palindromic-substring/solution/shua-chuan-lc-po-su-jie-fa-manacher-suan-i2px/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [9. 回文数 ](https://leetcode-cn.com/problems/palindrome-number/) | [【刷穿 LC】字符串/非字符串 (完全翻转&部分翻转)](https://leetcode-cn.com/problems/palindrome-number/solution/shua-chuan-lc-zi-fu-chuan-fei-zi-fu-chua-e8l0/) | 简单 | 🤩🤩🤩🤩 |
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| [5. 最长回文子串](https://leetcode-cn.com/problems/longest-palindromic-substring/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/longest-palindromic-substring/solution/shua-chuan-lc-po-su-jie-fa-manacher-suan-i2px/) | 中等 | 🤩🤩🤩🤩🤩 |
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| [9. 回文数 ](https://leetcode-cn.com/problems/palindrome-number/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/palindrome-number/solution/shua-chuan-lc-zi-fu-chuan-fei-zi-fu-chua-e8l0/) | 简单 | 🤩🤩🤩🤩 |
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‎Index/回溯算法.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [17. 电话号码的字母组合](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/solution/shua-chuan-lc-dfs-hui-su-jie-fa-by-ac_oi-qa02/) | 中等 | 🤩🤩🤩🤩 |
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| [37. 解数独](https://leetcode-cn.com/problems/sudoku-solver/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/sudoku-solver/solution/he-n-huang-hou-yi-yang-shi-yi-dao-hui-su-lfpd/) | 困难 | 🤩🤩🤩🤩 |
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| [39. 组合总和](https://leetcode-cn.com/problems/combination-sum/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/combination-sum/solution/dfs-hui-su-suan-fa-yi-ji-ru-he-que-ding-wpbo5/) | 中等 | 🤩🤩🤩🤩 |
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| [40. 组合总和 II](https://leetcode-cn.com/problems/combination-sum-ii/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/combination-sum-ii/solution/dfs-hui-su-jie-fa-yi-ji-ru-he-pan-duan-s-xlwy/) | 中等 | 🤩🤩🤩🤩 |
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‎Index/堆.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [23. 合并K个升序链表](https://leetcode-cn.com/problems/merge-k-sorted-lists/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/merge-k-sorted-lists/solution/shua-chuan-lc-you-xian-dui-lie-jie-fa-sh-3flb/) | 困难 | 🤩🤩🤩 |
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‎Index/多路归并.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| --------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------ | ---- | ---------- |
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| [21. 合并两个有序链表](https://leetcode-cn.com/problems/merge-two-sorted-lists/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/merge-two-sorted-lists/solution/shua-chuan-lc-shuang-zhi-zhen-jie-fa-sha-b22z/) | 简单 | 🤩🤩🤩🤩🤩 |
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‎Index/子串匹配.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [28. 实现 strStr()](https://leetcode-cn.com/problems/implement-strstr/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/implement-strstr/solution/shua-chuan-lc-shuang-bai-po-su-jie-fa-km-tb86/) | 简单 | 🤩🤩🤩🤩🤩 |
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‎Index/快慢指针.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---------- |
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| [19. 删除链表的倒数第 N 个结点](https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/solution/shua-chuan-lc-lian-biao-kuai-man-zhi-zhe-1gs1/) | 中等 | 🤩🤩🤩🤩🤩 |
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‎Index/括号问题.md

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| 题目 | 题解 | 难度 | 推荐指数 |
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| ------------------------------------------------------------ | ------------------------------------------------------------ | ---- | -------- |
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| [20. 有效的括号](https://leetcode-cn.com/problems/valid-parentheses/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/valid-parentheses/solution/shua-chuan-lc-zhan-ascii-chai-zhi-jie-fa-00zo/) | 简单 | 🤩🤩🤩🤩🤩 |
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| [22. 括号生成](https://leetcode-cn.com/problems/generate-parentheses/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/generate-parentheses/solution/shua-chuan-lc-dfs-jie-fa-by-ac_oier-nknl/) | 中等 | 🤩🤩🤩🤩 |
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| [32. 最长有效括号](https://leetcode-cn.com/problems/longest-valid-parentheses/) | [LeetCode 题解链接](https://leetcode-cn.com/problems/longest-valid-parentheses/solution/shua-chuan-lc-miao-dong-xi-lie-shi-yong-95ezk/) | 困难 | 🤩🤩🤩🤩 |
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