제출 #1163589

#제출 시각아이디문제언어결과실행 시간메모리
1163589jmuzhenEkoeko (COCI21_ekoeko)C++20
0 / 110
0 ms328 KiB
#include<bits/stdc++.h>
using namespace std;

signed main() {
    long long n; cin >> n;
    cout << n * (n-1) / 2;
}
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