Problem Details

#	When	Author	Problem	Language	CPU	Memory
20451	2024-05-21 15:59:47	jiupc49	Sum Game II	C++ 17	1 ms	3288 kb	Wrong Answer - 1

#include <iostream>
using namespace std;

int main(){

    int n,s;
    cin>>n;
    s =((n*(n+1)/2)-n);
    cout <<s;



}

#include <iostream>
using namespace std;
 
int main(){
 
    int n,s;
    cin>>n;
    s =((n*(n+1)/2)-n);
    cout <<s;
 
 
 
}