| 1245. Tree Diameter | | | Solve | Medium | | |
| 1249. Minimum Remove to Make Valid Parentheses | | | Solve | Medium | | |
| 1267. Count Servers that Communicate | | | Solve | Medium | | |
| 1273. Delete Tree Nodes | | | Solve | Medium | | |
| 1285. Find the Start and End Number of Continuous Ranges | | | Solve | Medium | | |
| 1306. Jump Game III | | | Solve | Medium | | |
| 1319. Number of Operations to Make Network Connected | | | Solve | Medium | | |
| 1324. Print Words Vertically | | | Solve | Medium | | |
| 1329. Sort the Matrix Diagonally | | | Solve | Medium | | |
| 1344. Angle Between Hands of a Clock | | | Solve | Medium | | |
| 1358. Number of Substrings Containing All Three Characters | | | Solve | Medium | | |
| 1367. Linked List in Binary Tree | | | Solve | Medium | | |
| 1371. Find the Longest Substring Containing Vowels in Even Counts | | | Solve | Medium | | |
| 1375. Number of Times Binary String Is Prefix-Aligned | | | Solve | Medium | | |
| 1386. Cinema Seat Allocation | | | Solve | Medium | | |
| 1404. Number of Steps to Reduce a Number in Binary Representation to One | | | Solve | Medium | | |
| 1405. Longest Happy String | | | Solve | Medium | | |
| 1415. The k-th Lexicographical String of All Happy Strings of Length n | | | Solve | Medium | | |
| 1441. Build an Array With Stack Operations | | | Solve | Medium | | |
| 1448. Count Good Nodes in Binary Tree | | | Solve | Medium | | |
| 1487. Making File Names Unique | | | Solve | Medium | | |
| 1541. Minimum Insertions to Balance a Parentheses String | | | Solve | Medium | | |
| 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target | | | Solve | Medium | | |
| 1551. Minimum Operations to Make Array Equal | | | Solve | Medium | | |
| 1570. Dot Product of Two Sparse Vectors | | | Solve | Medium | | |
| 1573. Number of Ways to Split a String | | | Solve | Medium | | |
| 1578. Minimum Time to Make Rope Colorful | | | Solve | Medium | | |
| 1584. Min Cost to Connect All Points | | | Solve | Medium | | |
| 1615. Maximal Network Rank | | | Solve | Medium | | |
| 1631. Path With Minimum Effort | | | Solve | Medium | | |
| 1638. Count Substrings That Differ by One Character | | | Solve | Medium | | |
| 1642. Furthest Building You Can Reach | | | Solve | Medium | | |
| 1647. Minimum Deletions to Make Character Frequencies Unique | | | Solve | Medium | | |
| 1650. Lowest Common Ancestor of a Binary Tree III | | | Solve | Medium | | |
| 1653. Minimum Deletions to Make String Balanced | | | Solve | Medium | | |
| 1664. Ways to Make a Fair Array | | | Solve | Medium | | |
| 1705. Maximum Number of Eaten Apples | | | Solve | Medium | | |
| 1712. Ways to Split Array Into Three Subarrays | | | Solve | Medium | | |
| 1740. Find Distance in a Binary Tree | | | Solve | Medium | | |
| 1743. Restore the Array From Adjacent Pairs | | | Solve | Medium | | |
| 1762. Buildings With an Ocean View | | | Solve | Medium | | |
| 1765. Map of Highest Peak | | | Solve | Medium | | |
| 1774. Closest Dessert Cost | | | Solve | Medium | | |
| 1775. Equal Sum Arrays With Minimum Number of Operations | | | Solve | Medium | | |
| 1780. Check if Number is a Sum of Powers of Three | | | Solve | Medium | | |
| 1802. Maximum Value at a Given Index in a Bounded Array | | | Solve | Medium | | |
| 1836. Remove Duplicates From an Unsorted Linked List | | | Solve | Medium | | |
| 1884. Egg Drop With 2 Eggs and N Floors | | | Solve | Medium | | |
| 1887. Reduction Operations to Make the Array Elements Equal | | | Solve | Medium | | |
| 1910. Remove All Occurrences of a Substring | | | Solve | Medium | | |
