比赛 20111104 评测结果 RRRRRRRRRR
题目名称 方程 最终得分 0
用户昵称 yifeng 运行时间 0.000 s
代码语言 C++ 内存使用 0.00 MiB
提交时间 2011-11-04 21:16:42
显示代码纯文本
#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;
long long X,K;
double S=1;

long long pl(long long num,long long level,long long moder)  
{  
    long long temp=1;  
    while (level)  
    {  
        temp=(temp*num)%moder;  
        level--;  
    }  
    return(temp);  
} 

long long Up[10000];
long long Down[10000];

int main()
{
	freopen("equation.in","r",stdin);
	freopen("equation.out","w",stdout);
	cin>>K>>X;
	X=X%1000;
	
	long long B=pl(X,X,1000);
	if(B==0)
	{
		cout<<0<<endl;
		return 0;
	}
	int ups=1,downs=1;
	int top=0;
	for (int i=1;i<=K-1;i++)
	{
		Up[ups]=B-ups;
		ups++;
	}
	
	for (int i=K-1;i>=1;i--)
	{
		Down[downs]=i;
		downs++;
	}
	top=downs-1;
	/*
	for (int i=1;i<=top;i++)
		cout<<Up[i]<<" ";
	cout<<endl;
	for (int i=1;i<=top;i++)
		cout<<Down[i]<<" ";
	cout<<endl;
	*/
	int p1=1;
	int p2=top;
	
	while(p1<=top)
	{
		S=S*Up[p2]/Down[p1];
		p2--;
		p1++;
	}
	if(S>1)
		printf("%0.lf\n",S);
	else
		cout<<0<<endl;
	return 0;
}