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Cod sursa(job #82119)
#include <iostream>
const int maxn = 2000;
FILE *in = fopen("patrate2.in","r"), *out = fopen("patrate2.out","w");
int N;
int H[maxn];
int B[maxn];
void mul(int A[], int B)
{
int i, t = 0;
for (i = 1; i <= A[0] || t; i++, t /= 100000)
A[i] = (t += A[i] * B) % 100000;
A[0] = i - 1;
}
//int C[maxn];
//void mulmare(int A[], int B[])
//{
// int i, j, t;
// for (i = 1; i <= A[0]; i++)
// {
// for (t=0, j=1; j <= B[0] || t; j++, t/=100000)
// C[i+j-1]=(t+=C[i+j-1]+A[i]*B[j])%100000;
// if (i + j - 2 > C[0]) C[0] = i + j - 2;
// }
//}
int main()
{
fscanf(in, "%d", &N);
H[0] = 1;
H[1] = 2;
int end = N*N;
for ( int i = 1; i < end; ++i )
mul(H, 2);
for ( int i = 2; i <= N; ++i )
mul(H, i);
for ( int i = H[0]; i; --i )
fprintf(out, "%d", H[i]);
return 0;
}