Submission #265581

#	Time	Username	Problem	Language	Result	Execution time	Memory
265581		taulant	Amusement Park (CEOI19_amusementpark)	C++14	42 / 100	3065 ms	148092 KiB

amusementpark

#include "bits/stdc++.h"
using namespace std;
#define int long long
typedef array<int, 2> pii;

int a[200], b[200];

int32_t main(){
	int n, m; cin >> n >> m;
	for(int i=0; i<m; ++i){
		cin >> a[i] >> b[i];
		--a[i], --b[i];
	}
	unordered_set<int> ans;
	vector<int> perm(n);
	for(int i=0; i<n; ++i) perm[i] = i; //height of ith start point
	int ret = 0;
	do {
		int x = 0;
		int y = 0;
		for(int i=0; i<m; ++i){
			if(perm[a[i]] < perm[b[i]]) x |= 1ll << i, ++y;
		}
		if(!ans.count(x)){
			ans.insert(x);
			ret += y;
		}
	} while(next_permutation(perm.begin(), perm.end()));
	cout << ret % 998244353 << endl;
}

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 0 / 21
• Subtask 5: 0 / 37