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int reverse_integer(int n) {
/*  int sign = 1;
    if(n < 0) {         // handle sign is unnecessary!
        n = -n;
        sign = -1;
    } */
    long long res = 0;  // gist, handle int overflow
    while(n != 0) {
        int last_digit = n%10;  // note that -22%10 = -2, so no need to handle sign
        res = 10 * res + last_digit;
        n /= 10;
    }
    if(res > INT_MAX) return -1;
    return (int)res;
}