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String

LeetCode 22: Generate Parentheses
·2 mins
LeetCode Daily Medium String Backtracking Recursion Combinatorics Parentheses
Generating all valid parentheses combinations using backtracking approach
LeetCode 20: Valid Parentheses
·2 mins
LeetCode Daily Easy String Stack Data-Structures Parentheses Validation
Solving the Valid Parentheses problem using stack-based approach
LeetCode 30: Substring with Concatenation of All Words (Brute Force → Counting → Sliding Window)
·3 mins
LeetCode Daily Hard String Sliding-Window Two-Pointers Hash-Map Brute-Force Frequency-Counting
Three approaches: brute force, counting optimization, and sliding window over word-length offsets.
LeetCode 1071: Greatest Common Divisor of Strings
·2 mins
LeetCode Daily Easy String Gcd Math
LeetCode Problem Solving
LeetCode 76: Minimum Window Substring
·3 mins
LeetCode Daily Hard String Sliding-Window Variable-Window Two-Pointers Hash-Map
LeetCode Problem Solving - Variable Size Sliding Window with Character Counting
LeetCode 1456: Maximum Number of Vowels in a Substring of Given Length
·2 mins
LeetCode Daily Medium String Sliding-Window Fixed-Window Vowel-Counting
LeetCode Problem Solving - Fixed Size Sliding Window with Vowel Counting
LeetCode 567: Permutation in String
·4 mins
LeetCode Daily Medium String Sliding-Window Hash-Map Frequency-Counting Permutation
LeetCode Problem Solving - Sliding Window with Character Frequency
LeetCode 438: Find All Anagrams in a String
·4 mins
LeetCode Daily Medium String Sliding-Window Hash-Map Anagram Frequency-Counting
LeetCode Problem Solving - Sliding Window with Character Frequency