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Frequency-Counting

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 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