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Count the substrings of word1 whose character counts dominate the counts of word2 (i.e., the substring can be rearranged so word2 appears as its prefix). This is essentially a frequency-vector comparison over all substrings of length >= |word2|, solvable with sliding-window/prefix-count techniques on lowercase letters.
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Leetcode 3297. Count Substrings That Can Be Rearranged to Contain a String I
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