Green and Red

 class Solution {

    static int RedOrGreen(int N, String S) {
        int Red = 0, Green = 0;
        for (int i = 0; i < N; i++) {
            if (S.charAt(i) == 'R')
                Red++;
            else
                Green++;
        }
        return Math.min(Red, Green);
    }
}

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