题目：

题解：

class Solution {public String getHint(String secret, String guess) {int bulls = 0;int[] cntS = new int[10];int[] cntG = new int[10];for (int i = 0; i < secret.length(); ++i) {if (secret.charAt(i) == guess.charAt(i)) {++bulls;} else {++cntS[secret.charAt(i) - '0'];++cntG[guess.charAt(i) - '0'];}}int cows = 0;for (int i = 0; i < 10; ++i) {cows += Math.min(cntS[i], cntG[i]);}return Integer.toString(bulls) + "A" + Integer.toString(cows) + "B";}
}