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class Solution { private static final Set<Character> vowels = Set.of('a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U'); public boolean halvesAreAlike(String s) { int balance = 0; for (int i = 0; i < s.length(); i++) { boolean isVowel = vowels.contains(s.charAt(i)); if (isVowel) { if (i < s.length() / 2) { balance++; } else { balance--; } } } return balance == 0; } }
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