Exponentiation

#include <bits/stdc++.h>
 
using namespace std;
 
//Definitions for quicker writing
#define REP(i,a,b) for (int i = a; i < b; i++)
#define clz __builtin_clz
#define ctz __builtin_ctz
#define popct __builtin_popcount
#define PB push_back
#define MP make_pair
#define F first
#define S second
#define X real()
#define Y imag()
 
//Typedefs for quicker writing
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef pair<int,int> pi;
typedef pair<long long, long long> pl;
typedef complex<long long> po;
 
//Max values
const long long lmx = LLONG_MAX;
const int imx = INT_MAX;
 
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() {
	//IO optimization
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	//Input definition
    ll n;
    cin >> n;
 
	//Main part
	ll a,b;
    REP(i,0,n){
	    cin >> a >> b;
	    cout << modpow(a,b,1000000007) << "\n";
    }
		
	//Return
	return 0;
 
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED