| Smallest Divisible Digit Product II | Hard | 14.4% | 82.7% |
| Shortest Palindrome | Hard | 41.9% | 74.8% |
| Median of Two Sorted Arrays | Hard | 46.0% | 63.1% |
| Largest Rectangle in Histogram | Hard | 49.4% | 50.4% |
| Department Top Three Salaries | Hard | 59.9% | 40.6% |
| Regular Expression Matching | Hard | 30.5% | 40.6% |
| Minimum Insertion Steps to Make a String Palindrome | Hard | 73.7% | 40.6% |
| Divide Nodes Into the Maximum Number of Groups | Hard | 67.0% | 40.6% |
| Candy | Hard | 48.0% | 40.6% |
| Trapping Rain Water | Hard | 66.8% | 40.6% |
| Longest Valid Parentheses | Hard | 38.1% | 40.6% |
| N-Queens | Hard | 75.0% | 40.6% |
