↓Skip to main content

String

LeetCode 22: Generate Parentheses
·2 mins
LeetCode Daily Medium Backtracking Recursion String Parentheses Combinatorics
Generating all valid parentheses combinations using backtracking approach
LeetCode 20: Valid Parentheses
·2 mins
LeetCode Daily Easy Stack String Parentheses Validation Algorithm Data-Structure
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 Frequency-Counter Brute-Force
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 Math Gcd
LeetCode Problem Solving
LeetCode 76: Minimum Window Substring
·3 mins
LeetCode Daily Hard Sliding Window String Hash Map Two Pointers Variable Window
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 Sliding Window String Vowel Counting Fixed Window
LeetCode Problem Solving - Fixed Size Sliding Window with Vowel Counting
LeetCode 567: Permutation in String
·4 mins
LeetCode Daily Medium Sliding Window String Permutation Frequency Counting Hash Table
LeetCode Problem Solving - Sliding Window with Character Frequency
LeetCode 438: Find All Anagrams in a String
·4 mins
LeetCode Daily Medium Sliding Window Hash Table String Anagram Frequency Counting
LeetCode Problem Solving - Sliding Window with Character Frequency