Problem Details

#	When	Author	Problem	Language	CPU	Memory
7062	2023-02-28 12:46:17	heisenberg_120	Sum Game II	C++ 17	3 ms	3504 kb	Accepted

#	CPU	Memory	Points
1	2 ms	3456 kb	1	Accepted

2	2 ms	3504 kb	1	Accepted

3	2 ms	3460 kb	1	Accepted

4	2 ms	3488 kb	1	Accepted

5	3 ms	3412 kb	1	Accepted

6	3 ms	3376 kb	1	Accepted

7	3 ms	3448 kb	1	Accepted

Code: (Toggle Highlighting) (Copy Source Code)

#include <bits/stdc++.h>
using namespace std;
#define int long long int

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt;
    cin >> tt;
    while (tt--){
        int n;
        cin >> n;
        n--;
        cout << n * (n + 1) / 2 << '\n';
    }
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define int long long int
 
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int tt;
    cin >> tt;
    while (tt--){
        int n;
        cin >> n;
        n--;
        cout << n * (n + 1) / 2 << '\n';
    }
    return 0;
}