OJ-Problems-Source/HDOJ/1130_autoAC.cpp

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2016-08-13 10:51:15 +08:00
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
#define base 10000
#define maxx 100
void multiply(int a[],int max,int b)
{
int i,array=0;
for(i=max-1;i>=0;i--)
{
array+=b*a[i];
a[i]=array%base;
array/=base;
}
}
void divide(int a[],int max,int b)
{
int i,div=0;
for(i=0;i<max;i++)
{
div=div*base+a[i];
a[i]=div/b;
div%=b;
}
}
int main()
{
int n,i;
int a[101][maxx];
memset(a[1],0,maxx*sizeof(int));
for(i=2,a[1][maxx-1]=1;i<101;i++)
{
memcpy(a[i],a[i-1],maxx*sizeof(int));
multiply(a[i],maxx,4*i-2);
divide(a[i],maxx,i+1);
}
while(scanf("%d",&n)!=EOF)
{
for(i=0;i<maxx&&a[n][i]==0;i++);
printf("%d",a[n][i++]);
for(;i<maxx;i++)
{
printf("%04d",a[n][i]);
}
printf("");
printf("\n");
}
return 0;
}