题解 | #Digit Sum of N!#
Digit Sum of N!
https://ac.nowcoder.com/acm/problem/15861
#include <iostream>
#include <algorithm>
#include <cstring>
using namespace std;
int main() {
int n;
while(cin>>n){
if(n==1){
cout<<1<<endl;
}
else if(n==2){
cout<<2<<endl;
}
else if(n==3||n==4){
cout<<6<<endl;
}
else if(n==5){
cout<<3<<endl;
}
else{
cout<<9<<endl;
}
}
}
