Submission #557874

#	Time	Username	Problem	Language	Result	Execution time	Memory
557874		FatihSolak	W (RMI18_w)	C++17	10 / 100	1099 ms	2512 KiB

w

#include <bits/stdc++.h>
#define N 200005
using namespace std;
void solve(){
	int n;
	cin >> n;
	vector<int> v;
	for(int i = 0;i<n;i++){
		int x;
		cin >> x;
		v.push_back(x);
	}
	sort(v.begin(),v.end());
	int ans = 0;
	do{
		int cnt = 0;
		int last = -1;
		for(int i = 1;i<n;i++){
			if(v[i] == v[i-1])continue;
			int now = (v[i] > v[i-1]);
			if(now != last){
				if(last == -1 && now == 1){
					break;
				}
				cnt++;
				last = now;
			}
		}
		if(cnt == 4){
			ans++;
		}
		//if(cnt == 4){
		//	for(auto u:v){
		//		cout << u << " ";
		//	}
		//	cout << endl;
		//}
	}while(next_permutation(v.begin(),v.end()));
	cout << ans << endl;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	#ifdef Local
		freopen("in.txt","r",stdin);
		freopen("out.txt","w",stdout);
	#endif
	int t = 1;
	//cin >> t;
	while(t--){
		solve();
	}
	#ifdef Local
		cout << endl << fixed << setprecision(2) << 1000.0*clock()/CLOCKS_PER_SEC << " milliseconds.";
	#endif
}

• Subtask 1: 5 / 20
• Subtask 2: 0 / 30
• Subtask 3: 5 / 50