| Longest Substring Without Repeating Characters | Medium | 38.5% | 86.8% |
| Group Anagrams | Medium | 72.2% | 80.8% |
| Valid Parentheses | Easy | 43.7% | 73.3% |
| Longest Palindromic Substring | Medium | 37.4% | 68.8% |
| Remove All Adjacent Duplicates in String II | Medium | 60.9% | 63.2% |
| Valid Anagram | Easy | 67.8% | 59.7% |
| Find Valid Pair of Adjacent Digits in String | Easy | 60.6% | 59.7% |
| Roman to Integer | Easy | 66.3% | 59.7% |
| Count Pairs Of Similar Strings | Easy | 73.6% | 59.7% |
| Generate Parentheses | Medium | 78.3% | 57.7% |
| Decode String | Medium | 62.3% | 57.7% |
| HTML Entity Parser | Medium | 50.3% | 57.7% |
| Longest Common Prefix | Easy | 47.1% | 55.5% |
| Word Squares II | Medium | 54.9% | 55.5% |
| Zigzag Conversion | Medium | 53.6% | 53.1% |
| Simplify Path | Medium | 50.0% | 53.1% |
| Restore IP Addresses | Medium | 55.3% | 53.1% |
| Implement Trie (Prefix Tree) | Medium | 69.2% | 53.1% |
| Time Based Key-Value Store | Medium | 49.7% | 50.3% |
| Word Ladder | Hard | 44.9% | 50.3% |
| Minimum Window Substring | Hard | 47.0% | 47.1% |
| Letter Combinations of a Phone Number | Medium | 65.5% | 47.1% |
| Word Break II | Hard | 55.1% | 47.1% |
| String Compression | Medium | 59.6% | 47.1% |
| Design In-Memory File System | Hard | 48.4% | 47.1% |
| Integer to Roman | Medium | 70.5% | 47.1% |
| Valid Palindrome | Easy | 52.8% | 47.1% |
| Palindromic Substrings | Medium | 72.6% | 47.1% |
| Reverse Vowels of a String | Easy | 60.7% | 47.1% |
| Word Search | Medium | 46.9% | 43.3% |
| Top K Frequent Words | Medium | 60.0% | 43.3% |
| Largest Number | Medium | 42.6% | 43.3% |
| Reverse Words in a String | Medium | 55.6% | 43.3% |
| Count Vowel Substrings of a String | Easy | 72.9% | 43.3% |
| Reorganize String | Medium | 56.8% | 43.3% |
| Search Suggestions System | Medium | 65.1% | 43.3% |
| Permutation in String | Medium | 48.5% | 38.7% |
| Maximum Number of Non-overlapping Palindrome Substrings | Hard | 43.3% | 38.7% |
| Open the Lock | Medium | 61.2% | 32.9% |
| Invalid Transactions | Medium | 32.1% | 32.9% |
| Basic Calculator | Hard | 46.6% | 32.9% |
| Integer to English Words | Hard | 34.8% | 32.9% |
| First Unique Character in a String | Easy | 65.1% | 32.9% |
| Word Break | Medium | 49.1% | 32.9% |
| Isomorphic Strings | Easy | 48.1% | 32.9% |
| Distinct Subsequences | Hard | 51.5% | 32.9% |
| Reformat Date | Easy | 68.3% | 32.9% |
| Remove All Adjacent Duplicates In String | Easy | 72.8% | 32.9% |
| Longest Substring with At Most K Distinct Characters | Medium | 49.9% | 32.9% |
| Regular Expression Matching | Hard | 30.5% | 32.9% |
| Basic Calculator II | Medium | 46.7% | 32.9% |
| Rotate String | Easy | 65.1% | 32.9% |
| Reverse Substrings Between Each Pair of Parentheses | Medium | 71.9% | 32.9% |
| Count Binary Substrings | Easy | 70.3% | 32.9% |
| Minimum Remove to Make Valid Parentheses | Medium | 71.3% | 32.9% |
| Add Strings | Easy | 52.1% | 32.9% |
| Decrypt String from Alphabet to Integer Mapping | Easy | 80.6% | 32.9% |
| Backspace String Compare | Easy | 49.8% | 24.9% |
| Text Justification | Hard | 50.5% | 24.9% |
| Edit Distance | Medium | 60.2% | 24.9% |
| Fraction to Recurring Decimal | Medium | 30.6% | 24.9% |
| Letter Tile Possibilities | Medium | 83.5% | 24.9% |
| Basic Calculator III | Hard | 53.2% | 24.9% |
| Plates Between Candles | Medium | 47.3% | 24.9% |
| Count and Say | Medium | 62.3% | 24.9% |
| Remove K Digits | Medium | 36.4% | 24.9% |
| Serialize and Deserialize Binary Tree | Hard | 60.4% | 24.9% |
| Encode and Decode Strings | Medium | 51.2% | 24.9% |
| Word Search II | Hard | 38.1% | 24.9% |
| Multiply Strings | Medium | 43.6% | 24.9% |
| Next Greater Element III | Medium | 35.2% | 24.9% |
| Greatest Common Divisor of Strings | Easy | 53.4% | 24.9% |
| Decode Ways | Medium | 37.6% | 24.9% |
| Merge Strings Alternately | Easy | 82.1% | 24.9% |
| Design Add and Search Words Data Structure | Medium | 48.2% | 24.9% |
| Minimum Number of Steps to Make Two Strings Anagram | Medium | 82.5% | 24.9% |
| Number of Valid Words in a Sentence | Easy | 31.0% | 24.9% |
| Minimum Insertion Steps to Make a String Palindrome | Hard | 73.7% | 24.9% |
| Wildcard Matching | Hard | 31.4% | 24.9% |
| Remove Invalid Parentheses | Hard | 49.8% | 24.9% |
| Longest Valid Parentheses | Hard | 38.1% | 24.9% |
| Validate IP Address | Medium | 28.2% | 24.9% |
| Design File System | Medium | 65.1% | 24.9% |
