| 399. Evaluate Division | | | Solve | Medium | | |
| 402. Remove K Digits | | | Solve | Medium | | |
| 403. Frog Jump | | | Solve | Hard | | |
| 404. Sum of Left Leaves | | | Solve | Easy | | |
| 413. Arithmetic Slices | | | Solve | Medium | | |
| 415. Add Strings | | | Solve | Easy | | |
| 421. Maximum XOR of Two Numbers in an Array | | | Solve | Medium | | |
| 422. Valid Word Square | | | Solve | Easy | | |
| 428. Serialize and Deserialize N-ary Tree | | | Solve | Hard | | |
| 430. Flatten a Multilevel Doubly Linked List | | | Solve | Medium | | |
| 433. Minimum Genetic Mutation | | | Solve | Medium | | |
| 438. Find All Anagrams in a String | | | Solve | Medium | | |
| 441. Arranging Coins | | | Solve | Easy | | |
| 445. Add Two Numbers II | | | Solve | Medium | | |
| 451. Sort Characters By Frequency | | | Solve | Medium | | |
| 454. 4Sum II | | | Solve | Medium | | |
| 488. Zuma Game | | | Solve | Hard | | |
| 492. Construct the Rectangle | | | Solve | Easy | | |
| 494. Target Sum | | | Solve | Medium | | |
| 496. Next Greater Element I | | | Solve | Easy | | |
| 503. Next Greater Element II | | | Solve | Medium | | |
| 511. Game Play Analysis I | | | Solve | Easy | | |
| 516. Longest Palindromic Subsequence | | | Solve | Medium | | |
| 518. Coin Change II | | | Solve | Medium | | |
| 529. Minesweeper | | | Solve | Medium | | |
| 530. Minimum Absolute Difference in BST | | | Solve | Easy | | |
| 532. K-diff Pairs in an Array | | | Solve | Medium | | |
| 535. Encode and Decode TinyURL | | | Solve | Medium | | |
| 538. Convert BST to Greater Tree | | | Solve | Medium | | |
| 542. 01 Matrix | | | Solve | Medium | | |
| 543. Diameter of Binary Tree | | | Solve | Easy | | |
| 545. Boundary of Binary Tree | | | Solve | Medium | | |
| 554. Brick Wall | | | Solve | Medium | | |
| 556. Next Greater Element III | | | Solve | Medium | | |
| 557. Reverse Words in a String III | | | Solve | Easy | | |
| 560. Subarray Sum Equals K | | | Solve | Medium | | |
| 566. Reshape the Matrix | | | Solve | Easy | | |
| 567. Permutation in String | | | Solve | Medium | | |
| 570. Managers with at Least 5 Direct Reports | | | Solve | Medium | | |
| 595. Big Countries | | | Solve | Easy | | |
| 605. Can Place Flowers | | | Solve | Easy | | |
| 607. Sales Person | | | Solve | Easy | | |
| 611. Valid Triangle Number | | | Solve | Medium | | |
| 626. Exchange Seats | | | Solve | Medium | | |
| 630. Course Schedule III | | | Solve | Hard | | |
| 632. Smallest Range Covering Elements from K Lists | | | Solve | Hard | | |
| 633. Sum of Square Numbers | | | Solve | Medium | | |
| 646. Maximum Length of Pair Chain | | | Solve | Medium | | |
| 652. Find Duplicate Subtrees | | | Solve | Medium | | |
| 658. Find K Closest Elements | | | Solve | Medium | | |
