View Code of Problem 610

#include <stdio.h>
#include <stdlib.h>

int main()
{

    int i,j,n,c;
    while(scanf("%d",&n)!=EOF)
    {
        long long a1,a2,a3;
    a1=a2=a3=1;

    for(i=1;i<=n;i++)
    {
       a1=a1*i;
    }
    for(j=1;j<=n*2;j++)
    {
        a2=a2*j;
    }
    for(i=1;i<=(n+1);i++)
    {
        a3=a3*i;
    }
    c=a2/(a3*a1);
    printf("%lld\n",c);
    }
    return 0;
}

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