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func findJudge(N int, trust [][]int) int {
    s, t := make([]int, N+1), make([]bool, N+1)
    for _, v := range trust {
        s[v[1]]++
        t[v[0]] = true
    }
    res := make([]int, 0)
    for i := 1; i < len(s); i++ {
        if s[i] == N - 1 && !t[i] {
            res = append(res, i)
        }
    }
    if len(res) != 1{
        return -1
    }
    return res[0]
}