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Cod sursa(job #157900)
#include <stdio.h>
#include <string.h>
#define N 1100
int A[N];
void mul(int A[], int B)
{
int i, t = 0;
for (i = 1; i <= A[0] || t; i++, t /= 10)
A[i] = (t += A[i] * B) % 10;
A[0] = i - 1;
}
void mul_mare(int A[], int B[])
{
int i, j, t, C[N];
memset(C, 0, sizeof(C));
for (i = 1; i <= A[0]; i++)
{
for (t=0, j=1; j <= B[0] || t; j++, t/=10)
C[i+j-1]=(t+=C[i+j-1]+A[i]*B[j])%10;
if (i + j - 2 > C[0]) C[0] = i + j - 2;
}
memcpy(A, C, sizeof(C));
}
int main()
{
int n,i,b;
A[0]=1; A[1]=1;
freopen("patrate2.in", "r",stdin);
freopen("patrate2.out", "w",stdout);
scanf("%d", &n);
b=n*n;
b-=1;
mul(A,2);
while (b>1)
if (b%2==1) { mul(A,2); --b;}
else { mul(A,4); b=b-2;}
/*for(i=1;i<=b;++i)
mul(A,2); */
//for(i=A[0];i>=1;--i)
// printf("%d", A[i]);
//printf("\n");
for(i=1;i<=n;++i)
mul(A,i);
for(i=A[0];i>=1;--i)
printf("%d", A[i]);
//for(i=rez[0];i>=1;--i)
// printf("%d", rez[i]);
return 0;
}
//2^(N*N)*N!