ℹ题目源于（2019.04.06~2020.08.07）的牛客面经，每一题目的出处与原始牛客链接对应关系见[issues](https://github.com/afatcoder/LeetcodeTop/issues)

| 题目| 出现次数| 链接|

|------------------------------|------|----------------------------------------------------------------------------------------------------|

| 215. 数组中的第K个最大元素| 6|https://leetcode-cn.com/problems/kth-largest-element-in-an-array|

| 124. 二叉树中的最大路径和| 4|https://leetcode-cn.com/problems/binary-tree-maximum-path-sum|

| 468. 验证IP地址| 3|https://leetcode-cn.com/problems/validate-ip-address|

| 236. 二叉树的最近公共祖先| 3|https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree|

| 206. 反转链表| 3|https://leetcode-cn.com/problems/reverse-linked-list|

| 91. 解码方法| 3|https://leetcode-cn.com/problems/decode-ways|

| 94. 二叉树的中序遍历| 3|https://leetcode-cn.com/problems/binary-tree-inorder-traversal|

| 15. 三数之和| 3|https://leetcode-cn.com/problems/3sum|

| 121. 买卖股票的最佳时机| 3|https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock|

| 48. 旋转图像| 3|https://leetcode-cn.com/problems/rotate-image|

| 543. 二叉树的直径| 3|https://leetcode-cn.com/problems/diameter-of-binary-tree|

| 53. 最大子序和| 3|https://leetcode-cn.com/problems/maximum-subarray|

| 4. 寻找两个正序数组的中位数| 2|https://leetcode-cn.com/problems/median-of-two-sorted-arrays|

| 110. 平衡二叉树| 2|https://leetcode-cn.com/problems/balanced-binary-tree|

| 146. LRU缓存机制| 2|https://leetcode-cn.com/problems/lru-cache|

| 103. 二叉树的锯齿形层次遍历| 2|https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal|

| 450. 删除二叉搜索树中的节点| 2|https://leetcode-cn.com/problems/delete-node-in-a-bst|

| 415. 字符串相加| 2|https://leetcode-cn.com/problems/add-strings|

| 62. 不同路径| 2|https://leetcode-cn.com/problems/unique-paths|

| 22. 括号生成| 2|https://leetcode-cn.com/problems/generate-parentheses|

| 1. 两数之和| 2|https://leetcode-cn.com/problems/two-sum|

| 79. 单词搜索| 2|https://leetcode-cn.com/problems/word-search|

| 200. 岛屿数量| 2|https://leetcode-cn.com/problems/number-of-islands|

| 89. 格雷编码| 2|https://leetcode-cn.com/problems/gray-code|

| 98. 验证二叉搜索树| 2|https://leetcode-cn.com/problems/validate-binary-search-tree|

| 剑指 Offer 46. 把数字翻译成字符串| 1|https://leetcode-cn.com/problems/ba-shu-zi-fan-yi-cheng-zi-fu-chuan-lcof|

| 84. 柱状图中最大的矩形| 1|https://leetcode-cn.com/problems/largest-rectangle-in-histogram|

| 120. 三角形最小路径和| 1|https://leetcode-cn.com/problems/triangle|

| 5. 最长回文子串| 1|https://leetcode-cn.com/problems/longest-palindromic-substring|

| 867. 转置矩阵| 1|https://leetcode-cn.com/problems/transpose-matrix|

| 560. 和为K的子数组| 1|https://leetcode-cn.com/problems/subarray-sum-equals-k|

| 986. 区间列表的交集| 1|https://leetcode-cn.com/problems/interval-list-intersections|

| 78. 子集| 1|https://leetcode-cn.com/problems/subsets|

| 907. 子数组的最小值之和| 1|https://leetcode-cn.com/problems/sum-of-subarray-minimums|

| 162. 寻找峰值| 1|https://leetcode-cn.com/problems/find-peak-element|

| 547. 朋友圈| 1|https://leetcode-cn.com/problems/friend-circles|

| 1013. 将数组分成和相等的三个部分| 1|https://leetcode-cn.com/problems/partition-array-into-three-parts-with-equal-sum|

| 34. 在排序数组中查找元素的第一个和最后一个位置| 1|https://leetcode-cn.com/problems/find-first-and-last-position-of-element-in-sorted-array|

| 142. 环形链表 II| 1|https://leetcode-cn.com/problems/linked-list-cycle-ii|

| 572. 另一个树的子树| 1|https://leetcode-cn.com/problems/subtree-of-another-tree|

| 154. 寻找旋转排序数组中的最小值 II| 1|https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array-ii|

| 704. 二分查找| 1|https://leetcode-cn.com/problems/binary-search|

| 151. 翻转字符串里的单词| 1|https://leetcode-cn.com/problems/reverse-words-in-a-string|

| 171. Excel表列序号| 1|https://leetcode-cn.com/problems/excel-sheet-column-number|

| 39. 组合总和| 1|https://leetcode-cn.com/problems/combination-sum|

| 150. 逆波兰表达式求值| 1|https://leetcode-cn.com/problems/evaluate-reverse-polish-notation|

| 283. 移动零| 1|https://leetcode-cn.com/problems/move-zeroes|

| 767. 重构字符串| 1|https://leetcode-cn.com/problems/reorganize-string|

| 10. 正则表达式匹配| 1|https://leetcode-cn.com/problems/regular-expression-matching|

| 459. 重复的子字符串| 1|https://leetcode-cn.com/problems/repeated-substring-pattern|

| 973. 最接近原点的 K 个点| 1|https://leetcode-cn.com/problems/k-closest-points-to-origin|

| 3. 无重复字符的最长子串| 1|https://leetcode-cn.com/problems/longest-substring-without-repeating-characters|

| 72. 编辑距离| 1|https://leetcode-cn.com/problems/edit-distance|

| 剑指 Offer 21. 调整数组顺序使奇数位于偶数前面| 1|https://leetcode-cn.com/problems/diao-zheng-shu-zu-shun-xu-shi-qi-shu-wei-yu-ou-shu-qian-mian-lcof|

| 426. 将二叉搜索树转化为排序的双向链表| 1|https://leetcode-cn.com/problems/convert-binary-search-tree-to-sorted-doubly-linked-list|

| 887. 鸡蛋掉落| 1|https://leetcode-cn.com/problems/super-egg-drop|

| 剑指 Offer 26. 树的子结构| 1|https://leetcode-cn.com/problems/shu-de-zi-jie-gou-lcof|

| 328. 奇偶链表| 1|https://leetcode-cn.com/problems/odd-even-linked-list|

| 137. 只出现一次的数字 II| 1|https://leetcode-cn.com/problems/single-number-ii|

| 155. 最小栈| 1|https://leetcode-cn.com/problems/min-stack|

| 剑指 Offer 52. 两个链表的第一个公共节点| 1|https://leetcode-cn.com/problems/liang-ge-lian-biao-de-di-yi-ge-gong-gong-jie-dian-lcof|

| 1375. 灯泡开关 III| 1|https://leetcode-cn.com/problems/bulb-switcher-iii|

| 662. 二叉树最大宽度| 1|https://leetcode-cn.com/problems/maximum-width-of-binary-tree|

| 76. 最小覆盖子串| 1|https://leetcode-cn.com/problems/minimum-window-substring|

| 449. 序列化和反序列化二叉搜索树| 1|https://leetcode-cn.com/problems/serialize-and-deserialize-bst|

| 47. 全排列 II| 1|https://leetcode-cn.com/problems/permutations-ii|

| 300. 最长上升子序列| 1|https://leetcode-cn.com/problems/longest-increasing-subsequence|

| 152. 乘积最大子数组| 1|https://leetcode-cn.com/problems/maximum-product-subarray|

| 44. 通配符匹配| 1|https://leetcode-cn.com/problems/wildcard-matching|

| 739. 每日温度| 1|https://leetcode-cn.com/problems/daily-temperatures|

| 122. 买卖股票的最佳时机 II| 1|https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-ii|

| 20. 有效的括号| 1|https://leetcode-cn.com/problems/valid-parentheses|

| 207. 课程表| 1|https://leetcode-cn.com/problems/course-schedule|

| 700. 二叉搜索树中的搜索| 1|https://leetcode-cn.com/problems/search-in-a-binary-search-tree|

| 701. 二叉搜索树中的插入操作| 1|https://leetcode-cn.com/problems/insert-into-a-binary-search-tree|

| 1312. 让字符串成为回文串的最少插入次数| 1|https://leetcode-cn.com/problems/minimum-insertion-steps-to-make-a-string-palindrome|

| 剑指 Offer 33. 二叉搜索树的后序遍历序列| 1|https://leetcode-cn.com/problems/er-cha-sou-suo-shu-de-hou-xu-bian-li-xu-lie-lcof|

| 139. 单词拆分| 1|https://leetcode-cn.com/problems/word-break|

| 557. 反转字符串中的单词 III| 1|https://leetcode-cn.com/problems/reverse-words-in-a-string-iii|

| 60. 第k个排列| 1|https://leetcode-cn.com/problems/permutation-sequence|

| 剑指 Offer 04. 二维数组中的查找| 1|https://leetcode-cn.com/problems/er-wei-shu-zu-zhong-de-cha-zhao-lcof|