| 1132. Reported Posts II | | | Solve | Medium | | |
| 1141. User Activity for the Past 30 Days I | | | Solve | Easy | | |
| 1142. User Activity for the Past 30 Days II | | | Solve | Easy | | |
| 1150. Check If a Number Is Majority Element in a Sorted Array | | | Solve | Easy | | |
| 1161. Maximum Level Sum of a Binary Tree | | | Solve | Medium | | |
| 1186. Maximum Subarray Sum with One Deletion | | | Solve | Medium | | |
| 1192. Critical Connections in a Network | | | Solve | Hard | | |
| 1197. Minimum Knight Moves | | | Solve | Medium | | |
| 1206. Design Skiplist | | | Solve | Hard | | |
| 1207. Unique Number of Occurrences | | | Solve | Easy | | |
| 1209. Remove All Adjacent Duplicates in String II | | | Solve | Medium | | |
| 1211. Queries Quality and Percentage | | | Solve | Easy | | |
| 1213. Intersection of Three Sorted Arrays | | | Solve | Easy | | |
| 1216. Valid Palindrome III | | | Solve | Hard | | |
| 1218. Longest Arithmetic Subsequence of Given Difference | | | Solve | Medium | | |
| 1225. Report Contiguous Dates | | | Solve | Hard | | |
| 1236. Web Crawler | | | Solve | Medium | | |
| 1241. Number of Comments per Post | | | Solve | Easy | | |
| 1245. Tree Diameter | | | Solve | Medium | | |
| 1249. Minimum Remove to Make Valid Parentheses | | | Solve | Medium | | |
| 1264. Page Recommendations | | | Solve | Medium | | |
| 1265. Print Immutable Linked List in Reverse | | | Solve | Medium | | |
| 1266. Minimum Time Visiting All Points | | | Solve | Easy | | |
| 1268. Search Suggestions System | | | Solve | Medium | | |
| 1275. Find Winner on a Tic Tac Toe Game | | | Solve | Easy | | |
| 1287. Element Appearing More Than 25% In Sorted Array | | | Solve | Easy | | |
| 1293. Shortest Path in a Grid with Obstacles Elimination | | | Solve | Hard | | |
| 1299. Replace Elements with Greatest Element on Right Side | | | Solve | Easy | | |
| 1305. All Elements in Two Binary Search Trees | | | Solve | Medium | | |
| 1312. Minimum Insertion Steps to Make a String Palindrome | | | Solve | Hard | | |
| 1319. Number of Operations to Make Network Connected | | | Solve | Medium | | |
| 1322. Ads Performance | | | Solve | Easy | | |
| 1326. Minimum Number of Taps to Open to Water a Garden | | | Solve | Hard | | |
| 1331. Rank Transform of an Array | | | Solve | Easy | | |
| 1340. Jump Game V | | | Solve | Hard | | |
| 1344. Angle Between Hands of a Clock | | | Solve | Medium | | |
| 1351. Count Negative Numbers in a Sorted Matrix | | | Solve | Easy | | |
| 1357. Apply Discount Every n Orders | | | Solve | Medium | | |
| 1361. Validate Binary Tree Nodes | | | Solve | Medium | | |
| 1382. Balance a Binary Search Tree | | | Solve | Medium | | |
| 1395. Count Number of Teams | | | Solve | Medium | | |
| 1398. Customers Who Bought Products A and B but Not C | | | Solve | Medium | | |
| 1416. Restore The Array | | | Solve | Hard | | |
| 1424. Diagonal Traverse II | | | Solve | Medium | | |
| 1428. Leftmost Column with at Least a One | | | Solve | Medium | | |
| 1429. First Unique Number | | | Solve | Medium | | |
| 1443. Minimum Time to Collect All Apples in a Tree | | | Solve | Medium | | |
| 1445. Apples & Oranges | | | Solve | Medium | | |
| 1453. Maximum Number of Darts Inside of a Circular Dartboard | | | Solve | Hard | | |
| 1454. Active Users | | | Solve | Medium | | |
