#include<iostream> #include<cstring> using namespace std; int a[100000],n,i,y,xy[100000]; int main() { cin>>n; a[0]=1; a[1]=1; for (y=1;y<=n;y++) { memset(xy,0,sizeof(xy)); xy[0]=a[0]; for (i=1;i<=a[0];i++) { xy[i]+=a[i]*y; xy[i+1]=xy[i]/10; xy[i]%=10; } while (xy[xy[0]+1]>0) { xy[xy[0]+2]=xy[xy[0]+1]/10; xy[xy[0]+1]%=10; xy[0]++; } for (i=1;i<=xy[0];i++) a[i]=xy[i]; a[0]=xy[0]; } for (i=a[0];i>=1;i--) cout<<a[i]; cout<<endl; return 0; } 模拟

已完成理解「#include<iostream> #include<cstring> using namespace std; int a[100000],n,i,y,xy[100000]; int main() { cin>>n; a[0]=1; a[1]=1; for (y=1;y<=n;y++) { memset(xy,0,sizeof(xy)); xy[0]=a[0]; for (i=1;i<=a[0];i++) { xy[i]+=a[i]*y; xy[i+1]=xy[i]/10; xy[i]%=10; } while (xy[xy[0]+1]>0) { xy[xy[0]+2]=xy[xy[0]+1]/10; xy[xy[0]+1]%=10; xy[0]++; } for (i=1;i<=xy[0];i++) a[i]=xy[i]; a[0]=xy[0]; } for (i=a[0];i>=1;i--) cout<<a[i]; cout<<endl; return 0; } 模拟」