Solutions to LeetCode by Java, JS, and Python
- 数据结构与算法
- 算法的衡量
- 数组
- 栈和队列
- 链表
- 字符串
- 哈希表
- 单调栈
- 单调队列
- 二叉树
- 二插堆
- 图
- 双指针
- 二分查找
- 滑动窗口
- Brute Force 算法
- KMP 算法
- Rabin Karp 算法
- 回溯算法
- 贪心算法
- 动态规划
- 分治算法
- 排序算法
- LRU 算法
- LFU 算法
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0069 | Sqrt(x) | Java/JS/Python | 数学、Brute Force 算法、二分查找 | Easy |
| 0146 | LRU Cache | Java/JS/Python | 设计、数据结构 | Medium |
| 0202 | Happy Number | Java/JS/Python | 数学、哈希表、双指针 | Easy |
| 0264 | Ugly Number II | Java/JS/Python | 数学、双指针、动态规划 | Medium |
| 0295 | Find Median from Data Stream | Java/JS/Python | 设计、数组、双指针、优先级队列 | Hard |
| 0355 | Design Twitter | Java/JS/Python | 设计 | Medium |
| 0367 | Valid Perfect Square | Java/JS/Python | 数学、Brute Force 算法、二分查找 | Easy |
| 0379 | Design Phone Directory | Java/JS/Python | 设计、哈希 | Medium |
| 0460 | LFU Cache | Java/JS/Python | 设计、数据结构 | Hard |
| 0729 | My Calendar I | Java/JS/Python | 设计、二叉搜索树 | Medium |
| 0855 | Exam Room | Java/JS/Python | 设计、优先级队列 | Medium |
| 0950 | Reveal Cards In Increasing Order | Java/JS/Python | 设计、排序、队列 | Medium |
| 1429 | First Unique Number | Java/JS/Python | 设计、哈希表、单调队列 | Medium |
| 1700 | Number of Students Unable to Eat Lunch | Java/JS/Python | 设计、哈希表、单调队列 | Easy |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| / | Merge Two Order Array | Java/JS/Python | 数组、双指针 | / |
| 0001 | Two Sum | Java/JS/Python | 数组、哈希表 | Easy |
| 0011 | Container With Most Water | Java/JS/Python | 数组、双指针 | Medium |
| 0015 | 3Sum | Java/JS/Python | 数组、哈希表、双指针、排序 | Medium |
| 0018 | 4Sum | Java/JS/Python | 数组、双指针 | Medium |
| 0026 | Remove Duplicates from Sorted Array | Java/JS/Python | 数组、双指针 | Easy |
| 0027 | Remove Element | Java/JS/Python | 数组、双指针 | Easy |
| 0033 | Search in Rotated Sorted Array | Java/JS/Python | 数组、二分查找 | Medium |
| 0034 | Find First and Last Position of Element in Sorted Array | Java/JS/Python | 数组、二分查找 | Medium |
| 0035 | Search Insert Position | Java/JS/Python | 数组、二分查找 | Easy |
| 0042 | Trapping Rain Water | Java/JS/Python | 数组、栈、单调栈、双指针 | Hard |
| 0057 | Insert Interval | Java/JS/Python | 数组s、扫描 | Medium |
| 0081 | Search in Rotated Sorted Array II | Java/JS/Python | 数组、二分查找 | Medium |
| 0084 | Largest Rectangle in Histogram | Java/JS/Python | 数组、双指针、栈、单调栈 | Hard |
| 0088 | Search in Rotated Sorted Array II | Java/JS/Python | 数组、双指针 | Medium |
| 0121 | Best Time to Buy and Sell Stock | Java/JS/Python | 数组、递推、DP | Easy |
| 0150 | Evaluate Reverse Polish Notation | Java/JS/Python | 数组、数学、栈 | Medium |
| 0162 | Find Peak Element | Java/JS/Python | 数组、二分查找 | Medium |
| 0169 | Majority Element | Java/JS/Python | 数组、哈希表、Moore's Voting Algorithm | Easy |
| 0217 | Contains Duplicate | Java/JS/Python | 数组、哈希表、排序 | Easy |
| 0209 | Minimum Size Subarray Sum | Java/JS/Python | 数组、滑动窗口 | Medium |
| 0215 | Kth Largest Element in an Array | Java/JS/Python | 数组、优先级队列（堆）、快速排序 | Medium |
| 0219 | Contains Duplicate II | Java/JS/Python | 数组、哈希表、滑动窗口 | Easy |
| 0220 | Contains Duplicate III | Java/JS/Python | 数组、二叉树搜索、桶排序、滑动窗口 | Hard |
| 0239 | Sliding Window Maximum | Java/JS/Python | 数组、队列、单调队列、堆（优先级队列） | Hard |
| 0252 | Meeting Rooms | Java/JS/Python | 数组、排序 | Easy |
| 0283 | Move Zeroes | Java/JS/Python | 数组、双指针 | Easy |
| 0238 | Product of Array Except Self | Java/JS/Python | 数组、前缀积 | Medium |
| 0303 | Range Sum Query - Immutable | Java/JS/Python | 数组、前缀和 | Easy |
| 0325 | Maximum Size Subarray Sum Equals k | Java/JS/Python | 数组、前缀和、哈希表 | Medium |
| 0347 | Top K Frequent Elements | Java/JS/Python | 数组、哈希表、优先队列 | Medium |
| 0360 | Sort Transformed Array | Java/JS/Python | 数组、数学、双指针 | Medium |
| 0349 | Intersection of Two Arrays | Java/JS/Python | 数组、哈希表、双指针 | Easy |
| 0370 | Range Addition | Java/JS/Python | 数组、差分数组 | Medium |
| 0373 | Find K Pairs with Smallest Sums | Java/JS/Python | 数组、链表双指针、堆（优先队列） | Medium |
| 0380 | Insert Delete GetRandom O(1) | Java/JS/Python | 数组、数学、设计、哈希表 | Medium |
| 0410 | Split Array Largest Sum | Java/JS/Python | 数组、贪心、二分查找、DP、前缀和 | Hard |
| 0442 | Find All Duplicates in an Array | Java/JS/Python | 数组、哈希表 | Easy |
| 0448 | Find All Numbers Disappeared in an Array | Java/JS/Python | 数组、哈希表 | Easy |
| 0496 | Next Greater Element I | Java/JS/Python | 数组、栈、单调栈 | Easy |
| 0503 | Next Greater Element II | Java/JS/Python | 数组、栈、单调栈 | Medium |
| 0523 | Continuous Subarray Sum | Java/JS/Python | 数组、哈希表、前缀和 | Medium |
| 0525 | Contiguous Array | Java/JS/Python | 数组、哈希表、前缀和 | Medium |
| 0528 | Random Pick with Weight | Java/JS/Python | 数组、前缀和、二分查找 | Medium |
| 0560 | Subarray Sum Equals K | Java/JS/Python | 数组、哈希表、前缀和 | Medium |
| 0658 | Find K Closest Elements | Java/JS/Python | 数组、双指针、二分查找 | Medium |
| 0692 | Top K Frequent Words | Java/JS/Python | 数组、优先级队列 | Medium |
| 0703 | Kth Largest Element in a Stream Easy Topics | Java/JS/Python | 数组、堆（优先级队列） | Easy |
| 0704 | Binary Search | Java/JS/Python | 数组、二分查找 | Easy |
| 0710 | Random Pick with Blacklist | Java/JS/Python | 数组、数学、随机算法 | Hard |
| 0713 | Subarray Product Less Than K | Java/JS/Python | 数组、滑动窗口 | Medium |
| 0724 | Find Pivot Index | Java/JS/Python | 数组、两次遍历、前缀和 | Easy |
| 0739 | Daily Temperatures | Java/JS/Python | 数组、栈、单调栈 | Medium |
| 0852 | Peak Index in a Mountain Array | Java/JS/Python | 数组、二分查找 | Medium |
| 0862 | Shortest Subarray with Sum at Least K | Java/JS/Python | 数组、二分查找、前缀和、单调队列 | Hard |
| 0870 | Advantage Shuffle | Java/JS/Python | 数组、双指针、排序 | Medium |
| 0875 | Koko Eating Bananas | Java/JS/Python | 数组、二分查找 | Medium |
| 0918 | Maximum Sum Circular Subarray | Java/JS/Python | 数组、环形数组、分治、动态规划、单调队列 | Medium |
| 0974 | Subarray Sums Divisible by K | Java/JS/Python | 数组、哈希表、前缀和 | Medium |
| 0977 | Squares of a Sorted Array | Java/JS/Python | 数组、双指针 | Easy |
| 1004 | Max Consecutive Ones III | Java/JS/Python | 数组、滑动窗口 | Medium |
| 1011 | Capacity To Ship Packages Within D Days | Java/JS/Python | 数组、二分查找 | Medium |
| 1094 | Car Pooling | Java/JS/Python | 数组、差分数组 | Medium |
| 1109 | Corporate Flight Bookings | Java/JS/Python | 数组、差分数组 | Medium |
| 1124 | 1124.Longest Well-Performing Interval | Java/JS/Python | 数组、哈希表、前缀和 | Medium |
| 1438 | Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | Java/JS/Python | 数组、单调队列、双指针、滑动窗口 | Medium |
| 1475 | Final Prices With a Special Discount in a Shop | Java/JS/Python | 数组、单调栈 | Easy |
| 1658 | Minimum Operations to Reduce X to Zero | Java/JS/Python | 数组、滑动窗口 | Medium |
| 1696 | Jump Game VI | Java/JS/Python | 数组、单调队列、动态规划 | Medium |
| 1845 | Seat Reservation Manager | Java/JS/Python | 数组、优先级队列 | Medium |
| 1944 | Number of Visible People in a Queue | Java/JS/Python | 数组、单调栈 | Hard |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0048 | Rotate Image | Java/JS/Python | 数组、数学、矩阵 | Medium |
| 0054 | Spiral Matrix | Java/JS/Python | 数组、数学、矩阵 | Medium |
| 0059 | Spiral Matrix II | Java/JS/Python | 数组、数学、矩阵 | Medium |
| 0074 | Search a 2D Matrix | Java/JS/Python | 数组、矩阵、二分查找 | Medium |
| 0240 | Search a 2D Matrix II | Java/JS/Python | 数组、矩阵、二分查找、双指针 | Medium |
| 0304 | Range Sum Query 2D - Immutable | Java/JS/Python | 数组、数学、矩阵、前缀和 | Medium |
| 0378 | Kth Smallest Element in a Sorted Matrix | Java/JS/Python | 数组、矩阵、链表双指针、二分查找、堆（优先队列） | Medium |
| 0519 | Random Flip Matrix | Java/JS/Python | 数组、数学、哈希表 | Medium |
| 1260 | Shift 2D Grid | Java/JS/Python | 数组、矩阵、双指针 | Easy |
| 1314 | Matrix Block Sum | Java/JS/Python | 数组、数学、矩阵、前缀和 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| / | Replace Number | Java/JS/Python | 字符串、双指针 | / |
| 0003 | Longest Substring Without Repeating Characters | Java/JS/Python | 字符串、哈希表、滑动窗口 | Medium |
| 0005 | Longest Palindromic Substring | Java/JS/Python | 字符串、双指针、滑动窗口、DP、Manacher's algorithm | Medium |
| 0020 | Valid Parentheses | Java/JS/Python | 字符串、栈 | Easy |
| 0028 | Find the Index of the First Occurrence in a String | Java/JS/Python | 字符串、滑动窗口、双指针、字符串匹配算法（BF/BM/KMP/RK/Horspool/Sunday） | Easy |
| 0049 | Group Anagrams | Java/JS/Python | 字符串、哈希表、排序 | Medium |
| 0076 | Minimum Window Substring | Java/JS/Python | 字符串、哈希表、滑动窗口 | Hard |
| 0151 | Reverse Words in a String | Java/JS/Python | 字符串、双指针 | Medium |
| 0187 | Repeated DNA Sequences | Java/JS/Python | 字符串、RK 算法 | Medium |
| 0224 | Basic Calculator | Java/JS/Python | 字符串、栈 | Hard |
| 0227 | Basic Calculator II | Java/JS/Python | 字符串、栈 | Medium |
| 0242 | Valid Anagram | Java/JS/Python | 字符串、哈希表 | Easy |
| 0316 | Remove Duplicate Letters | Java/JS/Python | 字符串、栈、贪心 | Medium |
| 0340 | Longest Substring with At Most K Distinct Characters | Java/JS/Python | 字符串、哈希表、滑动窗口 | Medium |
| 0344 | Reverse String | Java/JS/Python | 字符串、栈、递归、双指针 | Easy |
| 0383 | Ransom Note | Java/JS/Python | 字符串、哈希表 | Easy |
| 0387 | First Unique Character in a String | Java/JS/Python | 字符串、哈希表 | Easy |
| 0388 | Longest Absolute File Path | Java/JS/Python | 字符串、栈 | Medium |
| 0389 | Find the Difference | Java/JS/Python | 字符串、哈希表、位运算 | Easy |
| 0395 | Longest Substring with At Least K Repeating Characters | Java/JS/Python | 字符串、哈希表、分治、滑动窗口 | Medium |
| 0402 | Remove K Digits | Java/JS/Python | 字符串、栈、单调栈 | Medium |
| 0424 | Longest Repeating Character Replacement | Java/JS/Python | 字符串、哈希表、滑动窗口 | Medium |
| 0438 | Find All Anagrams in a String | Java/JS/Python | 字符串、哈希表、滑动窗口 | Medium |
| 0451 | Sort Characters By Frequency | Java/JS/Python | 字符串、优先队列（二叉堆） | Medium |
| 0459 | Repeated Substring Pattern | Java/JS/Python | 字符串、移动匹配、KMP 算法 | Easy |
| 0541 | Reverse String II | Java/JS/Python | 字符串、双指针、递归 | Easy |
| 0567 | Permutation in String | Java/JS/Python | 字符串、哈希表、滑动窗口 | Medium |
| 0921 | Minimum Add to Make Parentheses Valid | Java/JS/Python | 字符串、栈、贪心 | Medium |
| 1047 | Remove All Adjacent Duplicates In String | Java/JS/Python | 字符串、栈、双指针 | Easy |
| 1081 | Smallest Subsequence of Distinct Characters | Java/JS/Python | 字符串、栈、贪心 | Medium |
| 1541 | Minimum Insertions to Balance a Parentheses String | Java/JS/Python | 字符串、栈、贪心 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0019 | Remove Nth Node From End of List | Java/JS/Python | 链表、双指针、递归 | Medium |
| 0021 | Merge Two Sorted Lists | Java/JS/Python | 链表、双指针 | Easy |
| 0023 | Merge k Sorted Lists | Java/JS/Python | 链表、双指针、分治、堆（优先队列）、归并排序 | Hard |
| 0024 | Swap Nodes in Pairs | Java/JS/Python | 链表、双指针、递归、迭代 | Medium |
| 0025 | Reverse Nodes in k-Group | Java/JS/Python | 链表、递归、迭代 | Hard |
| 0061 | Rotate List | Java/JS/Python | 链表、双指针 | Medium |
| 0082 | Remove Duplicates from Sorted List II | Java/JS/Python | 链表、双指针 | Medium |
| 0083 | Remove Duplicates from Sorted List | Java/JS/Python | 链表、双指针 | Easy |
| 0086 | Partition List | Java/JS/Python | 链表、双指针 | Medium |
| 0092 | Reverse Linked List II | Java/JS/Python | 链表、双指针、递归 | Medium |
| 0138 | Copy List with Random Pointer | Java/JS/Python | 链表、哈希表、迭代、递归 | Medium |
| 0141 | Linked List Cycle | Java/JS/Python | 链表、哈希表、双指针 | Easy |
| 0142 | Linked List Cycle II | Java/JS/Python | 链表、双指针 | Medium |
| 0143 | Reorder List | Java/JS/Python | 链表、栈、双指针 | Medium |
| 0160 | Intersection of Two Linked Lists | Java/JS/Python | 链表、双指针 | Easy |
| 0206 | Reverse Linked List | Java/JS/Python | 链表、多指针、递归 | Easy |
| 0234 | Palindrome Linked List | Java/JS/Python | 链表、双指针 | Easy |
| 0707 | Design Linked List | Java/JS/Python | 链表、设计 | Medium |
| 0876 | Middle of the Linked List | Java/JS/Python | 链表、双指针 | Medium |
| 1019 | Next Greater Node In Linked List | Java/JS/Python | 链表、单调栈 | Easy |
| 1836 | Remove Duplicates From an Unsorted Linked List | Java/JS/Python | 链表、链表双指针 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0155 | Min Stack | Java/JS/Python | 设计、栈 | Medium |
| 0225 | Implement Stack using Queues | Java/JS/Python | 设计、栈、队列 | Easy |
| 0232 | Implement Queue using Stacks | Java/JS/Python | 设计、栈、队列 | Easy |
| 0346 | Moving Average from Data Stream | Java/JS/Python | 设计、队列 | Easy |
| 0362 | Design Hit Counter | Java/JS/Python | 设计、队列 | Medium |
| 0622 | Design Circular Queue | Java/JS/Python | 设计、队列、数组、链表 | Medium |
| 0641 | Design Circular Deque | Java/JS/Python | 设计、队列、数组、链表 | Medium |
| 0895 | Maximum Frequency Stack | Java/JS/Python | 设计、栈、模拟 | Hard |
| 0901 | Online Stock Span | Java/JS/Python | 设计、栈、单调栈 | Medium |
| 0933 | Number of Recent Calls | Java/JS/Python | 设计、队列 | Easy |
| 1670 | Design Front Middle Back Queue | Java/JS/Python | 设计、队列 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0094 | Binary Tree Inorder Traversal | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0095 | Unique Binary Search Trees II | Java/JS/Python | 二叉树、DFS | Medium |
| 0096 | Unique Binary Search Trees | Java/JS/Python | 二叉树、DFS、动态规划 | Medium |
| 0098 | Validate Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0101 | Symmetric Tree | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0102 | Binary Tree Level Order Traversal | Java/JS/Python | 二叉树、BFS | Medium |
| 0104 | Maximum Depth of Binary Tree | Java/JS/Python | 二叉树、BFS、动态规划、回溯算法 | Easy |
| 0105 | Construct Binary Tree from Preorder and Inorder Traversal | Java/JS/Python | 二叉树、递归 | Medium |
| 0106 | Construct Binary Tree from Inorder and Postorder Traversal | Java/JS/Python | 二叉树、递归 | Medium |
| 0107 | Binary Tree Level Order Traversal II | Java/JS/Python | 二叉树、BFS | Medium |
| 0108 | Convert Sorted Array to Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Easy |
| 0110 | Balanced Binary Tree | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0111 | Minimum Depth of Binary Tree | Java/JS/Python | 二叉树、BFS、DFS | Easy |
| 0112 | Path Sum | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0116 | Populating Next Right Pointers in Each Node | Java/JS/Python | 二叉树、BFS、DFS | Medium |
| 0117 | Populating Next Right Pointers in Each Node II | Java/JS/Python | 二叉树、BFS | Medium |
| 0144 | Binary Tree Preorder Traversal | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0145 | Binary Tree Postorder Traversal | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0199 | Binary Tree Right Side View | Java/JS/Python | 二叉树、BFS、DFS | Medium |
| 0222 | Count Complete Tree Nodes | Java/JS/Python | 二叉树、DFS、迭代、利用完全二叉树特性 | Medium |
| 0226 | Invert Binary Tree | Java/JS/Python | 二叉树、BFS、DFS | Easy |
| 0230 | Kth Smallest Element in a BST | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0235 | Lowest Common Ancestor of a Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0236 | Lowest Common Ancestor of a Binary Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0257 | Binary Tree Paths | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0297 | Serialize and Deserialize Binary Tree | Java/JS/Python | 二叉树、DFS、层序遍历 | Hard |
| 0341 | Flatten Nested List Iterator | Java/JS/Python | 二叉树、设计 | Medium |
| 0404 | Sum of Left Leaves | Java/JS/Python | 二叉树、DFS、迭代 | Easy |
| 0543 | Diameter of Binary Tree | Java/JS/Python | 二叉树、DFS | Easy |
| 0637 | Average of Levels in Binary Tree | Java/JS/Python | 二叉树、BFS | Easy |
| 0429 | N-ary Tree Level Order Traversal | Java/JS/Python | 二叉树、BFS | Medium |
| 0450 | Delete Node in a BST | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0501 | Find Mode in Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Easy |
| 0513 | Find Bottom Left Tree Value | Java/JS/Python | 二叉树、DFS、BFS | Medium |
| 0515 | Find Largest Value in Each Tree Row | Java/JS/Python | 二叉树、BFS、DFS | Medium |
| 0530 | Minimum Absolute Difference in BST | Java/JS/Python | 二叉树、递归、迭代 | Easy |
| 0538 | Convert BST to Greater Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0617 | Merge Two Binary Trees | Java/JS/Python | 二叉树、递归、迭代 | Easy |
| 0652 | Find Duplicate Subtrees | Java/JS/Python | 二叉树、递归 | Medium |
| 0654 | Maximum Binary Tree | Java/JS/Python | 二叉树、递归 | Medium |
| 0669 | Trim a Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0700 | Search in a Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Easy |
| 0701 | Insert into a Binary Search Tree | Java/JS/Python | 二叉树、递归、迭代 | Medium |
| 0889 | Construct Binary Tree from Preorder and Postorder Traversal | Java/JS/Python | 二叉树、递归 | Medium |
| 1373 | Maximum Sum BST in Binary Tree | Java/JS/Python | 二叉树、递归 | Hard |
| 1644 | Lowest Common Ancestor of a Binary Tree II | Java/JS/Python | 二叉树、递归 | Medium |
| 1650 | Lowest Common Ancestor of a Binary Tree III | Java/JS/Python | 二叉树、递归 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0752 | Open the Lock | Java/JS/Python | BFS | Medium |
| 0773 | Sliding Puzzle | Java/JS/Python | BFS | Hard |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0017 | Letter Combinations of a Phone Number | Java/JS/Python | 组合、回溯、哈希 | Medium |
| 0037 | Sudoku Solver | Java/JS/Python | 数独、回溯、哈希 | Hard |
| 0039 | Combination Sum | Java/JS/Python | 组合、回溯 | Medium |
| 0040 | Combination Sum II | Java/JS/Python | 组合、回溯 | Medium |
| 0046 | Permutations | Java/JS/Python | 排列、回溯 | Medium |
| 0047 | Permutations II | Java/JS/Python | 排列、回溯 | Medium |
| 0051 | N-Queens | Java/JS/Python | 棋盘、回溯 | Hard |
| 0052 | N-Queens II | Java/JS/Python | 棋盘、回溯 | Hard |
| 0077 | Combinations | Java/JS/Python | 组合、回溯 | Medium |
| 0078 | Subsets | Java/JS/Python | 子集、回溯 | Medium |
| 0090 | Subsets II | Java/JS/Python | 子集、回溯 | Medium |
| 0093 | Restore IP Addresses | Java/JS/Python | 分割、回溯 | Medium |
| 0131 | Palindrome Partitioning | Java/JS/Python | 分割、回溯 | Medium |
| 0140 | Word Break II | Java/JS/Python | 回溯 | Hard |
| 0216 | Combination Sum III | Java/JS/Python | 组合、回溯 | Medium |
| 0332 | Reconstruct Itinerary | Java/JS/Python | 回溯、图论 | Hard |
| 0491 | Non-decreasing Subsequences | Java/JS/Python | 排列组合，回溯 | Medium |
| No. | Title | Solution | Tags | Difficulty |
|---|---|---|---|---|
| 0053 | Maximum Subarray | Java/JS/Python | 动态规划、分治 | Medium |
| 0072 | Edit Distance | Java/JS/Python | 动态规划 | Hard |
| 0139 | Word Break | Java/JS/Python | 动态规划 | Medium |
| 0300 | Longest Increasing Subsequence | Java/JS/Python | 动态规划、二分查找 | Medium |
| 0322 | Coin Change | Java/JS/Python | 动态规划、BFS | Medium |
| 0509 | Fibonacci Number | Java/JS/Python | 动态规划、递归 | Medium |
| 0516 | Longest Palindromic Subsequence | Java/JS/Python | 动态规划 | Medium |
| 0583 | Delete Operation for Two Strings | Java/JS/Python | 动态规划 | Medium |
| 0712 | Minimum ASCII Delete Sum for Two Strings | Java/JS/Python | 动态规划 | Medium |
| 1143 | Longest Common Subsequence | Java/JS/Python | 动态规划 | Medium |