poj1995

快速幂

#include <iostream>
#include <cstdlib>
#include <cstring>
#include <cstdio>
using namespace std;

#define LL long long

int m, h;

LL power(LL a, LL b, LL m)
{
    if (a == 0)
        return 0;
    if (b == 0)
        return 1;
    a %= m;
    LL x = a;
    LL ret = 1;
    for (; b > 0; b >>= 1, x = x * x % m)
        if (b & 1)
            ret = ret * x % m;
    return ret;
}

int main()
{
    //freopen("t.txt", "r", stdin);
    int t;
    scanf("%d", &t);
    while (t--)
    {
        scanf("%d%d", &m, &h);
        LL ans = 0;
        for (int i = 0; i < h; i++)
        {
            LL a, b;
            scanf("%lld%lld", &a, &b);
            ans = (ans + power(a, b, m)) % m;
        }
        printf("%lld\n", ans);
    }
    return 0;
}