Submission #546788

#	Time	Username	Problem	Language	Result	Execution time	Memory
546788		Monarchuwu	Duathlon (APIO18_duathlon)	C++17	0 / 100	1 ms	340 KiB

count_triplets

#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;

const int N = 1e5 + 9;
int n;

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> n;
    cout << (ll)n * (n - 1) * (n - 2) / 3 << '\n';
}
/**  /\_/\
 *  (= ._.)
 *  / >0  \>1
**/

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• Subtask 9: 0 / 10