Exponentiation

#include <iostream>
using namespace std;

const int MOD = 1e9 + 7;

long long mod_exp(long long a, long long b, int mod) {
    long long result = 1;
    a %= mod;
    while (b > 0) {
        if (b % 2 == 1) {
            result = (result * a) % mod;
        }
        a = (a * a) % mod;
        b /= 2;
    }
    return result;
}

int main() {
    int n;
    cin >> n;
    while (n--) {
        long long a, b;
        cin >> a >> b;
        if (a == 0 && b == 0) {
            cout << 1 << '\n';
        } else {
            cout << mod_exp(a, b, MOD) << '\n';
        }
    }
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED