| Longest Common Prefix | Easy | 47.1% | 78.5% |
| Group Anagrams | Medium | 72.2% | 76.1% |
| Valid Parentheses | Easy | 43.7% | 72.7% |
| Longest Substring Without Repeating Characters | Medium | 38.5% | 72.0% |
| Valid Palindrome | Easy | 52.8% | 70.4% |
| Reverse Words in a String | Medium | 55.6% | 70.4% |
| Time Based Key-Value Store | Medium | 49.7% | 64.6% |
| Word Ladder | Hard | 44.9% | 59.5% |
| Basic Calculator II | Medium | 46.7% | 59.5% |
| Compare Version Numbers | Medium | 46.1% | 59.5% |
| Word Break | Medium | 49.1% | 58.1% |
| String Compression | Medium | 59.6% | 58.1% |
| Find the Index of the First Occurrence in a String | Easy | 46.3% | 58.1% |
| Implement Trie (Prefix Tree) | Medium | 69.2% | 56.5% |
| Ransom Note | Easy | 65.7% | 56.5% |
| Number of Pairs of Strings With Concatenation Equal to Target | Medium | 75.4% | 54.7% |
| First Unique Character in a String | Easy | 65.1% | 52.8% |
| Calculate Score After Performing Instructions | Medium | 56.9% | 52.8% |
| Regular Expression Matching | Hard | 30.5% | 52.8% |
| Binary Tree Paths | Easy | 68.2% | 52.8% |
| Serialize and Deserialize Binary Tree | Hard | 60.4% | 50.7% |
| Longest Palindromic Substring | Medium | 37.4% | 48.4% |
| Letter Combinations of a Phone Number | Medium | 65.5% | 48.4% |
| Generate Parentheses | Medium | 78.3% | 48.4% |
| Decode String | Medium | 62.3% | 48.4% |
| Remove All Adjacent Duplicates In String | Easy | 72.8% | 48.4% |
| Integer to English Words | Hard | 34.8% | 45.7% |
| Text Justification | Hard | 50.5% | 45.7% |
| Reverse String | Easy | 80.6% | 45.7% |
| String to Integer (atoi) | Medium | 20.6% | 42.6% |
| Roman to Integer | Easy | 66.3% | 42.6% |
| Edit Distance | Medium | 60.2% | 39.0% |
| Serialize and Deserialize N-ary Tree | Hard | 68.6% | 39.0% |
| Fizz Buzz | Easy | 75.3% | 39.0% |
| Interleaving String | Medium | 43.5% | 39.0% |
| Valid Anagram | Easy | 67.8% | 39.0% |
| Word Search | Medium | 46.9% | 39.0% |
| Brace Expansion | Medium | 66.8% | 34.7% |
| Design Log Storage System | Medium | 59.3% | 34.7% |
| Simplify Path | Medium | 50.0% | 34.7% |
| Alien Dictionary | Hard | 37.1% | 34.7% |
| Design Add and Search Words Data Structure | Medium | 48.2% | 34.7% |
| Find All Anagrams in a String | Medium | 53.3% | 34.7% |
| Palindromic Substrings | Medium | 72.6% | 34.7% |
| Valid Palindrome II | Easy | 44.0% | 34.7% |
| Validate IP Address | Medium | 28.2% | 34.7% |
| Add Binary | Easy | 57.7% | 29.1% |
| Determine if Two Strings Are Close | Medium | 54.2% | 29.1% |
| String Compression III | Medium | 67.0% | 29.1% |
| Robot Bounded In Circle | Medium | 56.5% | 29.1% |
| Word Ladder II | Hard | 27.5% | 29.1% |
| Longest Substring with At Most K Distinct Characters | Medium | 49.9% | 29.1% |
| Short Encoding of Words | Medium | 60.8% | 29.1% |
| Basic Calculator | Hard | 46.6% | 29.1% |
| Reconstruct Itinerary | Hard | 44.3% | 29.1% |
| Top K Frequent Words | Medium | 60.0% | 29.1% |
| Permutation in String | Medium | 48.5% | 21.7% |
| Parse Lisp Expression | Hard | 53.5% | 21.7% |
| Minimum Window Substring | Hard | 47.0% | 21.7% |
| Decode Ways | Medium | 37.6% | 21.7% |
| Similar String Groups | Hard | 56.1% | 21.7% |
| Minimum Remove to Make Valid Parentheses | Medium | 71.3% | 21.7% |
| Verifying an Alien Dictionary | Easy | 55.9% | 21.7% |
| Goat Latin | Easy | 69.9% | 21.7% |
| Word Pattern II | Medium | 48.8% | 21.7% |
| Split Strings by Separator | Easy | 76.0% | 21.7% |
| First Letter to Appear Twice | Easy | 74.9% | 21.7% |
| Guess the Word | Hard | 36.9% | 21.7% |
| Number of Changing Keys | Easy | 80.5% | 21.7% |
| Shortest Word Distance | Easy | 66.2% | 21.7% |
| Longest Common Subsequence | Medium | 58.9% | 21.7% |
| Zigzag Conversion | Medium | 53.6% | 21.7% |
| Reverse Vowels of a String | Easy | 60.7% | 21.7% |
| Longest Repeating Character Replacement | Medium | 59.1% | 21.7% |
| Substring with Concatenation of All Words | Hard | 34.0% | 21.7% |
| Sentence Similarity II | Medium | 51.1% | 21.7% |
| Encode and Decode TinyURL | Medium | 86.6% | 21.7% |
| Evaluate Division | Medium | 64.0% | 21.7% |
| Word Search II | Hard | 38.1% | 21.7% |
| One Edit Distance | Medium | 34.6% | 21.7% |
| Longest Happy Prefix | Hard | 51.9% | 21.7% |
| Valid Parenthesis String | Medium | 39.8% | 21.7% |
