| 1440. Evaluate Boolean Expression | Solution | Solve | Medium | | |
| 1445. Apples & Oranges | Solution | Solve | Medium | | |
| 1454. Active Users | Solution | Solve | Medium | | |
| 1459. Rectangles Area | Solution | Solve | Medium | | |
| 1468. Calculate Salaries | Solution | Solve | Medium | - | |
| 1485. Clone Binary Tree With Random Pointer | Solution | Solve | Medium | | |
| 1490. Clone N-ary Tree | Solution | Solve | Medium | | |
| 1500. Design a File Sharing System | Solution | Solve | Medium | | |
| 1501. Countries You Can Safely Invest In | Solution | Solve | Medium | - | |
| 1506. Find Root of N-Ary Tree | Solution | Solve | Medium | | |
| 1522. Diameter of N-Ary Tree | Solution | Solve | Medium | | |
| 1532. The Most Recent Three Orders | Solution | Solve | Medium | - | |
| 1533. Find the Index of the Large Integer | Solution | Solve | Medium | | |
| 1538. Guess the Majority in a Hidden Array | Solution | Solve | Medium | | |
| 1549. The Most Recent Orders for Each Product | Solution | Solve | Medium | | |
| 1554. Strings Differ by One Character | Solution | Solve | Medium | | |
| 1555. Bank Account Summary | Solution | Solve | Medium | | |
| 1564. Put Boxes Into the Warehouse I | Solution | Solve | Medium | | |
| 1570. Dot Product of Two Sparse Vectors | Solution | Solve | Medium | | |
| 1580. Put Boxes Into the Warehouse II | Solution | Solve | Medium | | |
| 1586. Binary Search Tree Iterator II | Solution | Solve | Medium | | |
| 1596. The Most Frequently Ordered Products for Each Customer | Solution | Solve | Medium | | |
| 1602. Find Nearest Right Node in Binary Tree | Solution | Solve | Medium | | |
| 1612. Check If Two Expression Trees are Equivalent | Solution | Solve | Medium | | |
| 1613. Find the Missing IDs | Solution | Solve | Medium | | |
| 1618. Maximum Font to Fit a Sentence in a Screen | Solution | Solve | Medium | | |
| 1628. Design an Expression Tree With Evaluate Function | Solution | Solve | Medium | | |
| 1634. Add Two Polynomials Represented as Linked Lists | Solution | Solve | Medium | | |
| 1644. Lowest Common Ancestor of a Binary Tree II | Solution | Solve | Medium | | |
| 1650. Lowest Common Ancestor of a Binary Tree III | Solution | Solve | Medium | | |
| 1660. Correct a Binary Tree | Solution | Solve | Medium | | |
| 1666. Change the Root of a Binary Tree | Solution | Solve | Medium | | |
| 1676. Lowest Common Ancestor of a Binary Tree IV | Solution | Solve | Medium | | |
| 1682. Longest Palindromic Subsequence II | Solution | Solve | Medium | - | |
| 1698. Number of Distinct Substrings in a String | Solution | Solve | Medium | | |
| 1699. Number of Calls Between Two Persons | Solution | Solve | Medium | | |
| 1709. Biggest Window Between Visits | Solution | Solve | Medium | - | |
| 1715. Count Apples and Oranges | Solution | Solve | Medium | - | |
| 1730. Shortest Path to Get Food | Solution | Solve | Medium | | |
| 1740. Find Distance in a Binary Tree | Solution | Solve | Medium | | |
| 1746. Maximum Subarray Sum After One Operation | Solution | Solve | Medium | | |
| 1747. Leetflex Banned Accounts | Solution | Solve | Medium | | |
| 1756. Design Most Recently Used Queue | Solution | Solve | Medium | | |
| 1762. Buildings With an Ocean View | Solution | Solve | Medium | | |
| 1772. Sort Features by Popularity | Solution | Solve | Medium | | |
| 1778. Shortest Path in a Hidden Grid | Solution | Solve | Medium | | |
| 1783. Grand Slam Titles | Solution | Solve | Medium | | |
| 1794. Count Pairs of Equal Substrings With Minimum Difference | Solution | Solve | Medium | | |
| 1804. Implement Trie II (Prefix Tree) | Solution | Solve | Medium | | |
| 1810. Minimum Path Cost in a Hidden Grid | Solution | Solve | Medium | | |
