find-the-town-judge-en.java

package java;

class FindTheTownJudgeEn {
    public int findJudge(int n, int[][] trust) {
        int[] count = new int[n + 1];
        for (int[] t : trust) {
            count[t[0]]--;
            count[t[1]]++;
        }
        for (int i = 1; i < n + 1; i++) {
            if (count[i] == n - 1) return i;
        }
        return -1;
    }
}