Exponentiation

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <queue>
#include <climits>
//#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll modpow(ll x, ll n, ll m) {
    if (n == 0) return 1%m;
    ll u = modpow(x,n/2,m);
    u = (u*u)%m;
    if (n%2 == 1) u = (u*x)%m;
    return u;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    ll n;
    cin >> n;

    for(ll i = 0; i < n; i++){
        ll a, b;
        cin >> a >> b;
        cout << modpow(a, b, 1000000007) << endl;
    }
    return 0;

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED