| 661 | Image Smoother | Easy |
| 669 | Trim a Binary Search Tree | Easy |
| 671 | Second Minimum Node In a Binary Tree | Easy |
| 674 | Longest Continuous Increasing Subsequence | Easy |
| 680 | Valid Palindrome II | Easy |
| 682 | Baseball Game | Easy |
| 693 | Binary Number with Alternating Bits | Easy |
| 696 | Count Binary Substrings | Easy |
| 697 | Degree of an Array | Easy |
| 700 | Search in a Binary Search Tree | Easy |
| 703 | Kth Largest Element in a Stream | Easy |
| 704 | Binary Search | Easy |
| 705 | Design HashSet | Easy |
| 706 | Design HashMap | Easy |
| 709 | To Lower Case | Easy |
| 717 | 1-bit and 2-bit Characters | Easy |
| 724 | Find Pivot Index | Easy |
| 728 | Self Dividing Numbers | Easy |
| 733 | Flood Fill | Easy |
| 744 | Find Smallest Letter Greater Than Target | Easy |
| 746 | Min Cost Climbing Stairs | Easy |
| 747 | Largest Number At Least Twice of Others | Easy |
| 762 | Prime Number of Set Bits in Binary Representation | Easy |
| 766 | Toeplitz Matrix | Easy |
| 771 | Jewels and Stones | Easy |
| 783 | Minimum Distance Between BST Nodes | Easy |
| 796 | Rotate String | Easy |
| 804 | Unique Morse Code Words | Easy |
| 806 | Number of Lines To Write String | Easy |
| 812 | Largest Triangle Area | Easy |