C語言源碼： [cpp] #include<stdio.h> #define maxsize 1000 #define size 1000000 int a[maxsize],b[maxsize]; int main() { int n,i,j,len; while(scanf("%d",&n)!=EOF) { for(i=0;i<maxsize;i++) a[i]=0; a[0]=1; len=1; i=2; while(i<=n) { for(j=0;j<maxsize;j++) b[j]=0; j=0; while(j<len) { b[j]+=a[j]*i; if(b[j]>=size) { b[j+1]+=b[j]/size; b[j]=b[j]%size; } j++; } j=len; while(j<len+4) { if(b[j]>=size) { b[j+1]+=b[j]/size; b[j]=b[j]%size; } j++; } len=len+4; while(b[len-1]==0) len--; for(j=0;j<len;j++) a[j]=b[j]; i++; } for(i=len-1;i>=0;i--) { if(i!=len-1) printf("%06d",a[i]); else printf("%d",a[i]); } printf("\n"); } }
