很简洁的一个模板

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int MOD = 1e9 + 7;

ll power(ll a, ll b)
{
    ll res = 1;
    for (; b; b >>= 1, a = a * a % MOD)
    {
        if (b & 1)
            res = res * a % MOD;
    }
    return res;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll a,b;cin>>a>>b;
    cout<<power(a,b);
    return 0;
}