yuzhoujr / Leetcode
👏🏻 leetcode solutions for Humans™
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公瑾现在提供以下服务哟！ http://yuzhoujr.com/legacy/dummynode.pdf
Mock Interview 经验 + 反馈
Journey
Array Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 624 | Maximum Distance in Arrays | Python | O(n) | O(1) |
Array Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 3 | Longest Substring Without Repeating Characters | Python | O(n) | O(n) | |
| 463 | Island Perimeter | Python | O(n^2) | O(1) |
Hash Table Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 1 | Two Sum | Python | O(n) | O(n) | 📺 |
| 242 | Valid Anagram | Python | O(n) | O(n) |
Linked List Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 21 | Merge Two Sorted Lists | Python | O(n) | O(n) | |
| 89 | Partition List | Python | O(n) | O(n) | |
| 141 | Linked List Cycle | Python | O(n) | O(1) | |
| 160 | Intersection of Two Linked Lists | Python | O(n) | O(1) | |
| 203 | Remove Linked List Elements | Python | O(n) | O(1) | |
| 206 | Reverse Linked List | Python | O(n) | O(1) | |
| 234 | Palindrome Linked List | Python | O(n) | O(1) | |
| 83 | Remove Duplicates from Sorted List | Python | O(n) | O(1) |
LinkedList Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 2 | Add Two Numbers | Python | O(n) | O(n) | |
| 445 | Add Two Numbers II | Python | O(n) | O(n) | |
| 142 | Linked List Cycle II | Python | O(n) | O(1) | 📺 |
| 328 | Odd Even Linked List | Python | O(n) | O(1) | |
| 143 | Reorder List | Python | O(n) | O(1) | |
| 24 | Swap Nodes in Pairs | Python | O(n) | O(1) | |
| 148 | Sort List | Python | O(nlogn) | O(1) | |
| 61 | Rotate List | Python | O(n) | O(1) | |
| 19 | Remove Nth Node From End of List | Python | O(n) | O(1) | 📺 |
| 138 | Copy List with Random Pointer | Python | O(n) | O(n) |
Stacks Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 155 | Min Stack | Python | O(1) | O(n) | |
| 225 | Implement Stack using Queues | Python | push/pop: O(1) top:O(n) | O(n) | |
| 20 | Valid Parentheses | Python | O(n) | O(n) | |
| 346 | Moving Average from Data Stream | Python | O(1) | O(n) |
Tree Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 110 | Balanced Binary Tree | Python | O(N) | O(h) | |
| 107 | Binary Tree Level Order Traversal II | Python | O(N) | O(h) | |
| 112 | Path Sum | Python | O(N) | O(h) | 📺 |
| 100 | Same Tree | Python | O(N) | O(1) | |
| 101 | Symmetric Tree | Python | O(N) | O(1) | 📺 |
| 104 | Maximum Depth of Binary Tree | Python | O(N) | O(1) | |
| 108 | Convert Sorted Array to Binary Search Tree | Python | O(N) | O(N) | 📺 |
| 111 | Minimum Depth of Binary Tree | Python | O(N) | O(1) | |
| 235 | Lowest Common Ancestor of a Binary Search Tree | Python | O(N) | O(1) | |
| 226 | Invert Binary Tree | Python | O(N) | O(1) | 📺 |
| 543 | Diameter of Binary Tree | Python | O(N) | O(h) | 📺 |
| 501 | Find Mode in Binary Search Tree | Python | O(N) | O(N) | 📺 |
| 257 | Binary Tree Paths | Python | O(N) | O(N) | 📺 |
| 572 | Subtree of Another Tree | Python | O(S*T) | O(1) | 📺 |
| 437 | Path Sum III | Python | O(N^2) | O(1) | |
| 404 | Sum of Left Leaves | Python | O(N) | O(1) | 📺 |
| 270 | Closest Binary Search Tree Value | Python | O(N) | O(1) | 📺 |
| 563 | Binary Tree Tilt | Python | O(N) | O(1) | 📺 |
| 538 | Convert BST to Greater Tree | Python | O(N) | O(1) | 📺 |
| 637 | Average of Levels in Binary Tree | Python | O(N) | O(1) |
Tree Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 144 | Binary Tree Preorder Traversal | Python | O(N) | O(N) | 📺 |
| 102 | Binary Tree Level Order Traversal | Python | O(N) | O(N) | 📺 |
| 107 | Binary Tree Level Order Traversal II | Python | O(N) | O(N) | |
| 515 | Find Largest Value in Each Tree Row | Python | O(N) | O(1) | |
| 236 | Lowest Common Ancestor of a Binary Tree | Python | O(N) | O(1) | 📺 |
| 199 | Binary Tree Right Side View | Python | O(N) | O(N) | 📺 |
| 114 | Flatten Binary Tree to Linked List | Python | O(N) | O(1) | 📺 |
| 230 | Kth Smallest Element in a BST | Python | O(N) | O(1) | 📺 |
| 582 | Kill Process | Python | O(N) | O(N) | 📺 |
Backtrack Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 78 | Subsets | Python | O(N*(2^N)) | O(2^N) | 📺 |
| 90 | Subsets II | Python | O(N*(2^N)) | O(2^N) | 📺 |
| 46 | Permutations | Python | O(N*(N!)) | O(N!) | 📺 |
| 47 | Permutations II | Python | O(N*(N!)) | O(N!) | 📺 |
| 60 | Permutation Sequence | Python | O(N * (N!) | O(N) | |
| 77 | Combinations | Python | O(N*(N!)) | O(N!) | |
| 39 | Combination Sum | Python | O(K * (2^N) | O(N) | 📺 |
| 40 | Combination Sum II | Python | O(K * (2^N) | O(N) | 📺 |
| 216 | Combination Sum III | Python | O(K * (2^N) | O(N) | |
| 17 | Letter Combinations of a Phone Number | Python | O(N*(4^N)) | O(N) | 📺 |
| 131 | Palindrome Partitioning | Python | O(N*(2^N)) | O(N) | 📺 |
Greedy Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 452 | Minimum Number of Arrows to Burst Balloons | Python | O(N) | O(1) |
Dynamic Programming Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 70 | Climbing Stairs | Python | O(N) | O(1) | Easy |
| 53 | Maximum Subarray | Python | O(N) | O(N) | Easy |
| 198 | House Robber | Python | O(N) | O(N) | Easy |
Dynamic Programming Medium
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 64 | Minimum Path Sum | Python | O(N^2) | O(M*N) | 📺 |
| 62 | Unique Paths | Python | O(N^2) | O(M*N) | Reference #64 |
| 55 | Jump Game | Python | O(N^2) | O(1) | TLE with DP/Use Greedy for O(N) Solution |
| 45 | Jump Game II | Python | O(N^2) | O(1) | TLE with DP/Use Greedy for O(N) Solution |
| 300 | Longest Increasing Subsequence | Python | O(N^2) | O(1) | Use Binary-Search for NlogN Solution |
BitMap Easy
| # | Title | Solution | Time | Space | Video |
|---|---|---|---|---|---|
| 136 | Single Number | Python | O(N) | O(1) | 📺 |
Contributors
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Backers
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License
🌱 MIT @ Yu Zhou 🌱
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