# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
1163594 | jmuzhen | Ekoeko (COCI21_ekoeko) | C++20 | 1 ms | 580 KiB |
#include<bits/stdc++.h>
using namespace std;
signed main() {
long long n; cin >> n;
string s; cin >> s;
cout << n * (n-1) / 2;
}
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