제출 #742260

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
742260		victor_gao	철인 이종 경기 (APIO18_duathlon)	C++17	0 / 100	1 ms	212 KiB

count_triplets

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;

signed main(){
    fast
    int n; cin>>n;
    cout<<n*(n-1)*(n-2)/3<<'\n';
}

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