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- String to Integer (AtoI - ASCII to Integer) - Recursive Solution
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- Valid Multiple Parentheses
- Longest substring with at most K unique characters
- Find Largest and Smallest word in a given String
- Most frequent word
- Longest contiguous character in a given String - O(N) Solution
- Find Lexicographically smallest or largest substring of size k
- Hamming Distance between two given strings
- Maximum Depth of Valid Nested Parentheses

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