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