| 72. 编辑距离 | 8 | https://leetcode-cn.com/problems/edit-distance |
| 103. 二叉树的锯齿形层次遍历 | 7 | https://leetcode-cn.com/problems/binary-tree-zigzag-level-order-traversal |
| 215. 数组中的第K个最大元素 | 6 | https://leetcode-cn.com/problems/kth-largest-element-in-an-array |
| 236. 二叉树的最近公共祖先 | 6 | https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree |
| 300. 最长上升子序列 | 6 | https://leetcode-cn.com/problems/longest-increasing-subsequence |
| 200. 岛屿数量 | 5 | https://leetcode-cn.com/problems/number-of-islands |
| 33. 搜索旋转排序数组 | 4 | https://leetcode-cn.com/problems/search-in-rotated-sorted-array |
| 69. x 的平方根 | 4 | https://leetcode-cn.com/problems/sqrtx |
| 3. 无重复字符的最长子串 | 3 | https://leetcode-cn.com/problems/longest-substring-without-repeating-characters |
| 23. 合并K个排序链表 | 3 | https://leetcode-cn.com/problems/merge-k-sorted-lists |
| 4. 寻找两个正序数组的中位数 | 3 | https://leetcode-cn.com/problems/median-of-two-sorted-arrays |
| 剑指 Offer 29. 顺时针打印矩阵 | 3 | https://leetcode-cn.com/problems/shun-shi-zhen-da-yin-ju-zhen-lcof |
| 695. 岛屿的最大面积 | 3 | https://leetcode-cn.com/problems/max-area-of-island |
| 240. 搜索二维矩阵 II | 3 | https://leetcode-cn.com/problems/search-a-2d-matrix-ii |
| 102. 二叉树的层序遍历 | 3 | https://leetcode-cn.com/problems/binary-tree-level-order-traversal |
| 49. 字母异位词分组 | 3 | https://leetcode-cn.com/problems/group-anagrams |
| 209. 长度最小的子数组 | 3 | https://leetcode-cn.com/problems/minimum-size-subarray-sum |
| 85. 最大矩形 | 3 | https://leetcode-cn.com/problems/maximal-rectangle |
| 287. 寻找重复数 | 3 | https://leetcode-cn.com/problems/find-the-duplicate-number |
| 64. 最小路径和 | 3 | https://leetcode-cn.com/problems/minimum-path-sum |
| 5. 最长回文子串 | 3 | https://leetcode-cn.com/problems/longest-palindromic-substring |
| 46. 全排列 | 3 | https://leetcode-cn.com/problems/permutations |
| 121. 买卖股票的最佳时机 | 3 | https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock |
| 15. 三数之和 | 3 | https://leetcode-cn.com/problems/3sum |
| 394. 字符串解码 | 3 | https://leetcode-cn.com/problems/decode-string |
| 110. 平衡二叉树 | 2 | https://leetcode-cn.com/problems/balanced-binary-tree |
| 572. 另一个树的子树 | 2 | https://leetcode-cn.com/problems/subtree-of-another-tree |
| 1. 两数之和 | 2 | https://leetcode-cn.com/problems/two-sum |
| 105. 从前序与中序遍历序列构造二叉树 | 2 | https://leetcode-cn.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal |
| 206. 反转链表 | 2 | https://leetcode-cn.com/problems/reverse-linked-list |
| 88. 合并两个有序数组 | 2 | https://leetcode-cn.com/problems/merge-sorted-array |
| 152. 乘积最大子数组 | 2 | https://leetcode-cn.com/problems/maximum-product-subarray |
| 70. 爬楼梯 | 2 | https://leetcode-cn.com/problems/climbing-stairs |
| 48. 旋转图像 | 2 | https://leetcode-cn.com/problems/rotate-image |
| 剑指 Offer 36. 二叉搜索树与双向链表 | 2 | https://leetcode-cn.com/problems/er-cha-sou-suo-shu-yu-shuang-xiang-lian-biao-lcof |
| 179. 最大数 | 2 | https://leetcode-cn.com/problems/largest-number |
| 剑指 Offer 51. 数组中的逆序对 | 2 | https://leetcode-cn.com/problems/shu-zu-zhong-de-ni-xu-dui-lcof |
| 143. 重排链表 | 2 | https://leetcode-cn.com/problems/reorder-list |
| 239. 滑动窗口最大值 | 2 | https://leetcode-cn.com/problems/sliding-window-maximum |
| 238. 除自身以外数组的乘积 | 2 | https://leetcode-cn.com/problems/product-of-array-except-self |
| 25. K 个一组翻转链表 | 2 | https://leetcode-cn.com/problems/reverse-nodes-in-k-group |
| 129. 求根到叶子节点数字之和 | 2 | https://leetcode-cn.com/problems/sum-root-to-leaf-numbers |
| 补充题4. 手撕快速排序 | 2 | https://leetcode-cn.com/problems/sort-an-array |
| 42. 接雨水 | 2 | https://leetcode-cn.com/problems/trapping-rain-water |
| 415. 字符串相加 | 2 | https://leetcode-cn.com/problems/add-strings |
| 221. 最大正方形 | 2 | https://leetcode-cn.com/problems/maximal-square |
| 400. 第N个数字 | 2 | https://leetcode-cn.com/problems/nth-digit |
| 54. 螺旋矩阵 | 2 | https://leetcode-cn.com/problems/spiral-matrix |
| 104. 二叉树的最大深度 | 1 | https://leetcode-cn.com/problems/maximum-depth-of-binary-tree |
| 160. 相交链表 | 1 | https://leetcode-cn.com/problems/intersection-of-two-linked-lists |
| 636. 函数的独占时间 | 1 | https://leetcode-cn.com/problems/exclusive-time-of-functions |
| 297. 二叉树的序列化与反序列化 | 1 | https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree |
| 814. 二叉树剪枝 | 1 | https://leetcode-cn.com/problems/binary-tree-pruning |
| 445. 两数相加 II | 1 | https://leetcode-cn.com/problems/add-two-numbers-ii |
| 2. 两数相加 | 1 | https://leetcode-cn.com/problems/add-two-numbers |
| 62. 不同路径 | 1 | https://leetcode-cn.com/problems/unique-paths |
| 63. 不同路径 II | 1 | https://leetcode-cn.com/problems/unique-paths-ii |
| 509. 斐波那契数 | 1 | https://leetcode-cn.com/problems/fibonacci-number |
| 128. 最长连续序列 | 1 | https://leetcode-cn.com/problems/longest-consecutive-sequence |
| 20. 有效的括号 | 1 | https://leetcode-cn.com/problems/valid-parentheses |
| 264. 丑数 II | 1 | https://leetcode-cn.com/problems/ugly-number-ii |
| 437. 路径总和 III | 1 | https://leetcode-cn.com/problems/path-sum-iii |
| 560. 和为K的子数组 | 1 | https://leetcode-cn.com/problems/subarray-sum-equals-k |
| 169. 多数元素 | 1 | https://leetcode-cn.com/problems/majority-element |
| 142. 环形链表 II | 1 | https://leetcode-cn.com/problems/linked-list-cycle-ii |
| 255. 验证前序遍历序列二叉搜索树 | 1 | https://leetcode-cn.com/problems/verify-preorder-sequence-in-binary-search-tree |
| 剑指 Offer 09. 用两个栈实现队列 | 1 | https://leetcode-cn.com/problems/yong-liang-ge-zhan-shi-xian-dui-lie-lcof |
| 124. 二叉树中的最大路径和 | 1 | https://leetcode-cn.com/problems/binary-tree-maximum-path-sum |
| 剑指 Offer 54. 二叉搜索树的第k大节点 | 1 | https://leetcode-cn.com/problems/er-cha-sou-suo-shu-de-di-kda-jie-dian-lcof |
| 518. 零钱兑换 II | 1 | https://leetcode-cn.com/problems/coin-change-2 |
| 50. Pow(x, n) | 1 | https://leetcode-cn.com/problems/powx-n |
| 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 |
| 807. 保持城市天际线 | 1 | https://leetcode-cn.com/problems/max-increase-to-keep-city-skyline |
| 123. 买卖股票的最佳时机 III | 1 | https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-iii |
| 315. 计算右侧小于当前元素的个数 | 1 | https://leetcode-cn.com/problems/count-of-smaller-numbers-after-self |
| 1363. 形成三的最大倍数 | 1 | https://leetcode-cn.com/problems/largest-multiple-of-three |
| 376. 摆动序列 | 1 | https://leetcode-cn.com/problems/wiggle-subsequence |
| 1143. 最长公共子序列 | 1 | https://leetcode-cn.com/problems/longest-common-subsequence |
| 32. 最长有效括号 | 1 | https://leetcode-cn.com/problems/longest-valid-parentheses |
| 718. 最长重复子数组 | 1 | https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray |
| 440. 字典序的第K小数字 | 1 | https://leetcode-cn.com/problems/k-th-smallest-in-lexicographical-order |
| 334. 递增的三元子序列 | 1 | https://leetcode-cn.com/problems/increasing-triplet-subsequence |
| 582. 杀死进程 | 1 | https://leetcode-cn.com/problems/kill-process |
| 面试题 16.03. 交点 | 1 | https://leetcode-cn.com/problems/intersection-lcci |
| 96. 不同的二叉搜索树 | 1 | https://leetcode-cn.com/problems/unique-binary-search-trees |
| 41. 缺失的第一个正数 | 1 | https://leetcode-cn.com/problems/first-missing-positive |
| 403. 青蛙过河 | 1 | https://leetcode-cn.com/problems/frog-jump |
| 726. 原子的数量 | 1 | https://leetcode-cn.com/problems/number-of-atoms |
| 剑指 Offer 10- I. 斐波那契数列 | 1 | https://leetcode-cn.com/problems/fei-bo-na-qi-shu-lie-lcof |
| 405. 数字转换为十六进制数 | 1 | https://leetcode-cn.com/problems/convert-a-number-to-hexadecimal |
| 1420. 生成数组 | 1 | https://leetcode-cn.com/problems/build-array-where-you-can-find-the-maximum-exactly-k-comparisons |
| 306. 累加数 | 1 | https://leetcode-cn.com/problems/additive-number |
| 98. 验证二叉搜索树 | 1 | https://leetcode-cn.com/problems/validate-binary-search-tree |
| 227. 基本计算器 II | 1 | https://leetcode-cn.com/problems/basic-calculator-ii |
| 1505. 最多 K 次交换相邻数位后得到的最小整数 | 1 | https://leetcode-cn.com/problems/minimum-possible-integer-after-at-most-k-adjacent-swaps-on-digits |
| 632. 最小区间 | 1 | https://leetcode-cn.com/problems/smallest-range-covering-elements-from-k-lists |
| 871. 最低加油次数 | 1 | https://leetcode-cn.com/problems/minimum-number-of-refueling-stops |
| 107. 二叉树的层次遍历 II | 1 | https://leetcode-cn.com/problems/binary-tree-level-order-traversal-ii |
| 407. 接雨水 II | 1 | https://leetcode-cn.com/problems/trapping-rain-water-ii |
| 199. 二叉树的右视图 | 1 | https://leetcode-cn.com/problems/binary-tree-right-side-view |
| 84. 柱状图中最大的矩形 | 1 | https://leetcode-cn.com/problems/largest-rectangle-in-histogram |
| 74. 搜索二维矩阵 | 1 | https://leetcode-cn.com/problems/search-a-2d-matrix |
| 329. 矩阵中的最长递增路径 | 1 | https://leetcode-cn.com/problems/longest-increasing-path-in-a-matrix |
| 172. 阶乘后的零 | 1 | https://leetcode-cn.com/problems/factorial-trailing-zeroes |
| 153. 寻找旋转排序数组中的最小值 | 1 | https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array |
| 432. 全 O(1) 的数据结构 | 1 | https://leetcode-cn.com/problems/all-oone-data-structure |
| 470. 用 Rand7() 实现 Rand10() | 1 | https://leetcode-cn.com/problems/implement-rand10-using-rand7 |
| 164. 最大间距 | 1 | https://leetcode-cn.com/problems/maximum-gap |
| 94. 二叉树的中序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-inorder-traversal |
| 剑指 Offer 62. 圆圈中最后剩下的数字 | 1 | https://leetcode-cn.com/problems/yuan-quan-zhong-zui-hou-sheng-xia-de-shu-zi-lcof |
| 658. 找到 K 个最接近的元素 | 1 | https://leetcode-cn.com/problems/find-k-closest-elements |
| 704. 二分查找 | 1 | https://leetcode-cn.com/problems/binary-search |
| 355. 设计推特 | 1 | https://leetcode-cn.com/problems/design-twitter |
| 剑指 Offer 11. 旋转数组的最小数字 | 1 | https://leetcode-cn.com/problems/xuan-zhuan-shu-zu-de-zui-xiao-shu-zi-lcof |
| 698. 划分为k个相等的子集 | 1 | https://leetcode-cn.com/problems/partition-to-k-equal-sum-subsets |
| 224. 基本计算器 | 1 | https://leetcode-cn.com/problems/basic-calculator |
| 剑指 Offer 22. 链表中倒数第k个节点 | 1 | https://leetcode-cn.com/problems/lian-biao-zhong-dao-shu-di-kge-jie-dian-lcof |
| 31. 下一个排列 | 1 | https://leetcode-cn.com/problems/next-permutation |
| 875. 爱吃香蕉的珂珂 | 1 | https://leetcode-cn.com/problems/koko-eating-bananas |
| 145. 二叉树的后序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-postorder-traversal |
| 19. 删除链表的倒数第N个节点 | 1 | https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list |
| 673. 最长递增子序列的个数 | 1 | https://leetcode-cn.com/problems/number-of-longest-increasing-subsequence |
| 剑指 Offer 34. 二叉树中和为某一值的路径 | 1 | https://leetcode-cn.com/problems/er-cha-shu-zhong-he-wei-mou-yi-zhi-de-lu-jing-lcof |
| 670. 最大交换 | 1 | https://leetcode-cn.com/problems/maximum-swap |
| 141. 环形链表 | 1 | https://leetcode-cn.com/problems/linked-list-cycle |
| 897. 递增顺序查找树 | 1 | https://leetcode-cn.com/problems/increasing-order-search-tree |
| 653. 两数之和 IV - 输入 BST | 1 | https://leetcode-cn.com/problems/two-sum-iv-input-is-a-bst |
| 310. 最小高度树 | 1 | https://leetcode-cn.com/problems/minimum-height-trees |
| 167. 两数之和 II - 输入有序数组 | 1 | https://leetcode-cn.com/problems/two-sum-ii-input-array-is-sorted |
| 611. 有效三角形的个数 | 1 | https://leetcode-cn.com/problems/valid-triangle-number |
| 92. 反转链表 II | 1 | https://leetcode-cn.com/problems/reverse-linked-list-ii |
| 剑指 Offer 07. 重建二叉树 | 1 | https://leetcode-cn.com/problems/zhong-jian-er-cha-shu-lcof |
| 525. 连续数组 | 1 | https://leetcode-cn.com/problems/contiguous-array |
| 144. 二叉树的前序遍历 | 1 | https://leetcode-cn.com/problems/binary-tree-preorder-traversal |
| 378. 有序矩阵中第K小的元素 | 1 | https://leetcode-cn.com/problems/kth-smallest-element-in-a-sorted-matrix |