Record the process of Leetcode by issue
| Weekly Contest | Date |
|---|---|
| Weekly Contest 162 | 11/10/2019 |
| BiWeekly Contest 13 | 11/16/2019 |
| Weekly Contest 163 | 11/17/2019 |
| Weekly Contest 166 | 12/8/2019 |
| Weekly Contest 167 | 12/15/2019 |
| Weekly Contest 168 | 12/22/2019 |
| Num | Problem | Level | Topics | Date |
|---|---|---|---|---|
| 409 | Longest Palindrome | Easy | Hash Table |
10/25/2019 |
| 290 | Word Pattern | Easy | Array Two Pointers Binary Search |
10/25/2019 |
| 49 | Group Anagrams | Medium | Hash Table String |
10/27/2019 |
| 3 | Longest Substring Without Repeating Characters | Medium | Hash Table Two Pointers String Sliding Window |
10/28/2019 |
| 187 | Repeated DNA Sequences | Medium | Hash Table Bit Manipulation |
10/29/2019 |
| 76 | Minimum Window Substring | Hard | Hash Table Two Pointers String Sliding Window |
10/30/2019 |
| 1237 | Find Positive Integer Solution for a Given Equation | Easy | Math Binary Search |
10/30/2019 |
| 113 | Path Sum II | Medium | Tree Depth-first Search |
10/30/2019 |
| 236 | Lowest Common Ancestor of a Binary Tree | Medium | Tree |
10/30/2019 |
| 114 | Flatten Binary Tree to Linked List | Medium | Tree Depth-first Search |
10/31/2019 |
| 199 | Binary Tree Right Side View | Medium | Tree Depth-first Search Breadth-first Search |
11/1/2019 |
| 207 | Course Schedule | Medium | Depth-first Search Breadth-first Search Graph Topological Sort |
11/2/2019 |
| 70 | Climbing Stairs | Easy | Dynamic Programming |
11/2/2019 |
| 198 | House Robber | Easy | Dynamic Programming |
11/3/2019 |
| 53 | Maximum Subarray | Easy | Array Divide and Conquer Dynamic Programming |
11/4/2019 |
| 322 | Coin Change | Medium | Dynamic Programming |
11/5/2019 |
| 120 | Triangle | Medium | Array Dynamic Programming |
11/6/2019 |
| 300 | Longest Increasing Subsequence | Hard | Binary Search Dynamic Programming |
11/8/2019 |
| 64 | Minimum Path Sum | Medium | Array Dynamic Programming |
11/9/2019 |
| 174 | Dungeon Game | Hard | Dynamic Programming Binary Search |
11/12/2019 |
| 200 | Number of Islands | Medium | Depth-first Search Breadth-first Search Union Find |
11/13/2019 |
| 1254 | Number of Closed Islands | Medium | Depth-first Search |
11/14/2019 |
| 127 | Word Ladder | Medium | Breadth-first Search |
11/15/2019 |
| 1255 | Maximum Score Words Formed by Letters | Hard | Bit Manipulation |
11/18/2019 |
| 1256 | Encode Number | Medium | Bit Manipulation |
11/22/2019 |
| 1260 | Shift 2D Grid | Easy | Array |
11/23/2019 |
| 1275 | Find Winner on a Tic Tac Toe Game | Easy | Array |
12/5/2019 |
| 126 | Word Ladder II | Hard | Array Breadth-first Search String Backtracking |
12/5/2019 |
| 1276 | Number of Burgers with No Waste of Ingredients | Medium | Math Greedy |
12/6/2019 |
| 473 | Matchsticks to Square | Medium | Depth-first Search |
12/7/2019 |
| 1283 | Find the Smallest Divisor Given a Threshold | Medium | Binary Search |
12/8/2019 |
| 1282 | Group the People Given the Group Size They Belong To | Medium | Greedy |
12/8/2019 |
| 1277 | Count Square Submatrices with All Ones | Medium | Dynamic Programming Array |
12/8/2019 |
| 1266 | Minimum Time Visiting All Points | Easy | Array Geometry |
12/10/2019 |
| 1267 | Count Servers that Communicate | Medium | Array Graph |
12/10/2019 |
| 551 | Student Attendance Record I | Easy | String |
12/11/2019 |
| 1268 | Search Suggestions System | Medium | String |
12/11/2019 |
| 1269 | Number of Ways to Stay in the Same Place After Some Steps | Hard | Dynamic Programming |
12/11/2019 |
| 1287 | Element Appearing More Than 25% In Sorted Array | Easy | Array |
12/15/2019 |
| 1288 | Remove Covered Intervals | Medium | Line Sweep |
12/15/2019 |
| 1291 | Sequential Digits | Medium | Backtracking |
12/15/2019 |
| 1292 | Maximum Side Length of a Square with Sum Less than or Equal to Threshold | Medium | Array Binary Search |
12/15/2019 |
| 1293 | Shortest Path in a Grid with Obstacles Elimination | Hard | Breadth-first Search |
12/17/2019 |
| 1286 | Iterator for Combination | Medium | Design Backtracking |
12/17/2019 |
| 1247 | Minimum Swaps to Make Strings Equal | Medium | String Greedy |
12/19/2019 |
| 1249 | Minimum Remove to Make Valid Parentheses | Medium | String Stack |
12/20/2019 |
| 1250 | Check If It Is a Good Array | Hard | Math |
12/20/2019 |
| 785 | Is Graph Bipartite? | Medium | Breadth-first Search Depth-first Search Graph |
12/21/2019 |
| 143 | Reorder List | Medium | Linked List |
12/21/2019 |
| 876 | Middle of the Linked List | Easy | Linked List |
12/21/2019 |
| 206 | Reverse Linked List | Easy | Linked List |
12/21/2019 |
| 929 | Unique Email Addresses | Easy | String |
12/21/2019 |
| 824 | Goat Latin | Easy | String |
12/22/2019 |
| 970 | Powerful Integers | Easy | Math Hash Table |
12/22/2019 |
| 104 | Maximum Depth of Binary Tree | Easy | Tree Depth-first Search |
12/22/2019 |
| 110 | Balanced Binary Tree | Easy | Tree Depth-first Search |
12/22/2019 |
| 1295 | Find Numbers with Even Number of Digits | Easy | Array |
12/23/2019 |
| 1296 | Divide Array in Sets of K Consecutive Numbers | Medium | Greedy Array |
12/23/2019 |
| 1297 | Maximum Number of Occurrences of a Substring | Medium | Bit Manipulation String |
12/23/2019 |
| 1304 | Find N Unique Integers Sum up to Zero | Easy | Array |
1/10/2020 |
| 1305 | All Elements in Two Binary Search Trees | Medium | Sort Tree |
1/10/2020 |
| 1306 | Jump Game III | Medium | Breadth-first Search Graph |
1/10/2020 |
| 2 | Add Two Numbers | Medium | Linked List Math |
7/21/2020 |
| 1518 | Water Bottles | Easy | Greedy |
7/22/2020 |