#21134: _c++
weiweitseng
(Wei Wei)
#include <iostream>
using namespace std;
int main(){
int a;
while (cin>>a){
cout<<a*(a-1)+2<<endl;
}
}
#26111: Re:c++
1066108@tjps.tp.edu.tw
(Sunday)
#include
using namespace std;
int main(){
int a;
while (cin>>a){
cout<<a*(a-1)+2<<endl;
}
}
這算是直接代公式了