| 1239. Maximum Length of a Concatenated String with Unique Characters | | | Solve | Medium | | |
| 1244. Design A Leaderboard | | | Solve | Medium | | |
| 1248. Count Number of Nice Subarrays | | | Solve | Medium | | |
| 1249. Minimum Remove to Make Valid Parentheses | | | Solve | Medium | | |
| 1258. Synonymous Sentences | | | Solve | Medium | | |
| 1268. Search Suggestions System | | | Solve | Medium | | |
| 1288. Remove Covered Intervals | | | Solve | Medium | | |
| 1291. Sequential Digits | | | Solve | Medium | | |
| 1297. Maximum Number of Occurrences of a Substring | | | Solve | Medium | | |
| 1305. All Elements in Two Binary Search Trees | | | Solve | Medium | | |
| 1306. Jump Game III | | | Solve | Medium | | |
| 1311. Get Watched Videos by Your Friends | | | Solve | Medium | | |
| 1314. Matrix Block Sum | | | Solve | Medium | | |
| 1315. Sum of Nodes with Even-Valued Grandparent | | | Solve | Medium | | |
| 1319. Number of Operations to Make Network Connected | | | Solve | Medium | | |
| 1325. Delete Leaves With a Given Value | | | Solve | Medium | | |
| 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance | | | Solve | Medium | | |
| 1338. Reduce Array Size to The Half | | | Solve | Medium | | |
| 1339. Maximum Product of Splitted Binary Tree | | | Solve | Medium | | |
| 1344. Angle Between Hands of a Clock | | | Solve | Medium | | |
| 1352. Product of the Last K Numbers | | | Solve | Medium | | |
| 1353. Maximum Number of Events That Can Be Attended | | | Solve | Medium | | |
| 1361. Validate Binary Tree Nodes | | | Solve | Medium | | |
| 1362. Closest Divisors | | | Solve | Medium | | |
| 1367. Linked List in Binary Tree | | | Solve | Medium | | |
| 1372. Longest ZigZag Path in a Binary Tree | | | Solve | Medium | | |
| 1376. Time Needed to Inform All Employees | | | Solve | Medium | | |
| 1386. Cinema Seat Allocation | | | Solve | Medium | | |
| 1393. Capital Gain/Loss | | | Solve | Medium | | |
| 1395. Count Number of Teams | | | Solve | Medium | | |
| 1396. Design Underground System | | | Solve | Medium | | |
| 1404. Number of Steps to Reduce a Number in Binary Representation to One | | | Solve | Medium | | |
| 1405. Longest Happy String | | | Solve | Medium | | |
| 1409. Queries on a Permutation With Key | | | Solve | Medium | | |
| 1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K | | | Solve | Medium | | |
| 1419. Minimum Number of Frogs Croaking | | | Solve | Medium | | |
| 1423. Maximum Points You Can Obtain from Cards | | | Solve | Medium | | |
| 1429. First Unique Number | | | Solve | Medium | | |
| 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit | | | Solve | Medium | | |
| 1451. Rearrange Words in a Sentence | | | Solve | Medium | | |
| 1454. Active Users | | | Solve | Medium | | |
| 1456. Maximum Number of Vowels in a Substring of Given Length | | | Solve | Medium | | |
| 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts | | | Solve | Medium | | |
| 1466. Reorder Routes to Make All Paths Lead to the City Zero | | | Solve | Medium | | |
| 1472. Design Browser History | | | Solve | Medium | | |
| 1481. Least Number of Unique Integers after K Removals | | | Solve | Medium | | |
| 1488. Avoid Flood in The City | | | Solve | Medium | | |
| 1492. The kth Factor of n | | | Solve | Medium | | |
| 1497. Check If Array Pairs Are Divisible by k | | | Solve | Medium | | |
| 1498. Number of Subsequences That Satisfy the Given Sum Condition | | | Solve | Medium | | |
