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풀이

class Solution {
    public int solution(String s) {
		char first = s.charAt(0);
		int firstNum = 0;
		int diff = 0;
		int result = 0;
		for (int i = 0; i < s.length(); i++) {
			if (firstNum == diff) {
				result++;
				first = s.charAt(i);
			}
			if (s.charAt(i) == first) firstNum++;
			else diff++;
		}
		return result;
	}
}

 

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