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;
while (cin >> n) {
int index = -1;
if(n>2){
if(n%2==1) index = 2;
else if(n%4==0) index = 3;
else if(n%4==2) index = 4;
}
cout<<index<<endl;
}
}