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11 problems total
| Title | Difficulty | Videos | Companies |
|---|---|---|---|
| Find the Index of the First Occurrence in a String | easy | - | |
| Convert String to Integer atoi | medium | - | |
| Valid Parentheses | easy | ||
| Longest Valid Parentheses | hard | - | |
| Reverse Words in a String | medium | - | |
| Word Search 2 - Return All Words | hard | ||
| Different Ways to Add Parentheses | medium | - | |
| Serialize and Deserialize Binary Tree | hard | ||
| Longest Substring with At Most K Distinct Characters | medium | - | |
| Palindromic Substrings | medium | ||
| Longest String Chain | medium | - |