Exponentiation

    1#include <bits/stdc++.h>
    2using namespace std;
    3using ll = long long;
    4using i128 = __int128;
    5const int inf = 1e9;
    6const ll INF = 1e18; //❄️
    7const int mod = 1e9 + 7;
    8ll power(ll a, ll b) {
    9    ll res = 1;
    10    a %= mod;
    11    while (b) {
    12        if (b & 1) res = ((res % mod) * (a % mod)) % mod;
    13        a = ((a % mod) * (a % mod)) % mod;
    14        b >>= 1;
    15    }
    16    return res;
    17}
    18int main() {
    19    ios::sync_with_stdio(0); cin.tie(0); 
    20    int n; cin >> n;
    21    while (n--) {
    22        ll a, b; cin >> a >> b;
    23        if (a == 0 && b == 0) cout << 1 << '\n';
    24        else cout << power(a, b) << '\n';
    25    }
    26    return 0;
    27}