🧠 Before you code — what pattern fits?
Given a string s and an integer k, return the maximum number of vowel letters in any substring of s with length k.
("abciiidef", 3) → 3
("aeiou", 2) → 2
("leetcode", 3) → 2
🎬 Video explanation · NeetCodeIO
Your solution runs against 3 unit tests, including edge and large-value cases.
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Test console · 3 unit tests
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