poj 1995 快速幂（裸）

Raising Modulo Numbers

Description

People are different. Some secretly read magazines full of interesting girls‘ pictures, others create an A-bomb in their cellar, others like using Windows, and some like difficult mathematical games. Latest marketing research shows, that this market segment was so far underestimated and that there is lack of such games. This kind of game was thus included into the KOKODáKH. The rules follow:

Each player chooses two numbers Ai and Bi and writes them on a slip
of paper. Others cannot see the numbers. In a given moment all players
show their numbers to the others. The goal is to determine the sum of
all expressions Ai^Bi from all players including oneself and
determine the remainder after division by a given number M. The winner
is the one who first determines the correct result. According to the
players‘ experience it is possible to increase the difficulty by
choosing higher numbers.

You should write a program that calculates the result and is able to find out who won the game.

Input

The
input consists of Z assignments. The number of them is given by the
single positive integer Z appearing on the first line of input. Then the
assignements follow. Each assignement begins with line containing an
integer M (1 <= M <= 45000). The sum will be divided by this
number. Next line contains number of players H (1 <= H <= 45000).
Next exactly H lines follow. On each line, there are exactly two numbers
Ai and Bi separated by space. Both numbers cannot be equal zero at the
same time.

Output

For each assingnement there is the only one line of output. On this line, there is a number, the result of expression

(A₁^B₁+A₂^B₂+ ... +A_H^B_H)mod M.

Sample Input

3
16
4
2 3
3 4
4 5
5 6
36123
1
2374859 3029382
17
1
3 18132

Sample Output

2
13195
13
直接裸快速幂就能过了

#include<iostream>
using namespace std;

int pow1(int a,int b,int m)
{
    int res = 1;
    a %= m;
    while(b)
    {
        if(b&1)
            res = res*a%m;
        a = a*a%m;
        b >>= 1;
    }
    return res;
}

int main()
{
    int n;
    int mod,m,sum;
    int a,b;
    cin>>n;
    while(n--)
    {
        cin>>mod>>m;
        sum = 0;
        for(int i = 0;i<m;i++)
        {
            cin>>a>>b;
            sum = (sum + pow1(a,b,mod))%mod;
        }
        cout<<sum%mod<<endl;
    }
}

原文地址：https://www.cnblogs.com/ZZUGPY/p/8479607.html