题解 | #杨辉三角的变形#
杨辉三角的变形
https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
#include <iostream>
using namespace std;
int main() {
int n;
cin>>n;
if (n==1||n==2){
cout<<-1<<endl;
}
else{
int a=(n-2)%4;
switch (a){
case 1: cout<<2<<endl;break;
case 2: cout<<3<<endl;break;
case 3: cout<<2<<endl;break;
case 0: cout<<4<<endl;break;
}
}
return 0;
}
