day-13:猜数字游戏

class Solution {
    public String getHint(String secret, String guess) {
        int a = 0;
        int b = 0;
        char[] s = secret.toCharArray();
        char[] g = guess.toCharArray();
        int len = s.length;
        int[] count = new int[10];
        for(int i = 0; i < len; i++){
            if(s[i] == g[i]) a++;
            count[(int)(s[i] - '0')]++;
        }
        for(int i = 0; i < len; i++){
            if(count[(int)(g[i] - '0')]>0){
                b++;
                count[(int)(g[i] - '0')]--;
            }
        }
        b = b - a;
        String result = String.valueOf(a) + "A" + String.valueOf(b) + "B";
        return result;
    }
}