NeetCode #878LC-1371MediumBit Manipulation
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#878 · #1371 · Find the Longest Substring Containing Vowels in Even Counts(每个元音包含偶数次的最长子字符串)

📌 Problem Statement & Constraints

Given a string s, return the length of the longest substring in which each of the vowels a, e, i, o, u occurs an even number of times. Constraints: 1 <= s.length <= 5 * 10^5, and s consists only of lowercase English letters.
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