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leetcode-algorithms/src/BullsAndCows.java at master · prashanthigupta/leetcode-algorithms · GitHub

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public class BullsAndCows {

public static String getHint(String secret, String guess) {

int bulls = 0, cows = 0;

int[] count = new int[10];

for (int index =0 ; index < secret.length() ; index++) {

if (secret.charAt(index) == guess.charAt(index)) {

bulls++;

} else {

if (count[secret.charAt(index) - '0']++ < 0) cows++;

if (count[guess.charAt(index) - '0']-- > 0) cows++;

}

}

return bulls + "A" + cows + "B";

}

}