Exponentiation

#include <bits/stdc++.h>

#define REP(i, a, b) for (int i = a; i < b; i++)

// Type Aliases for 1D and 2D vectors with initialization
#define vll(n, val) vector<long long>(n, val) // 1D vector of long longs with size n, initialized to val
#define ll long long
#define vvi(n, m, val) vector<vector<int>>(n, vector<int>(m, val))              // 2D vector of ints (n x m), initialized to val
#define vvll(n, m, val) vector<vector<long long>>(n, vector<long long>(m, val)) // 2D vector of long longs (n x m), initialized to val

using namespace std;

void print_vector(vector<int> &x)
{
    for (int v : x)
    {
        cout << v << " ";
    }
    cout << "\n";
}

void print_matrix(vector<vector<int>> &matrix)
{
    cout << "\n"
         << "----------------" << "\n";
    for (vector<int> row : matrix)
    {
        print_vector(row);
    }
    cout << "\n"
         << "----------------" << "\n";
}

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

int main()
{
    int n;
    cin >> n;

    int m = 1e9 + 7;
    // cout << m << "\n";
    for (int i = 0; i < n; i++)
    {
        int a, b;
        cin >> a >> b;
        cout << modpow(a, b, m) << "\n";
    }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED