Submission #1248565

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248565		KindaGoodGames	Amusement Park (CEOI19_amusementpark)	C++20	42 / 100	3092 ms	227664 KiB

amusementpark

#include<bits/stdc++.h>

using namespace std;

#define int long long
#define pii pair<int,int>

int n,m;
int mod = 998244353; 
 

int32_t main(){
    cin >> n >> m;
    vector<pii> edges(m); 

    for(int i = 0; i < m; i++){
        int a,b;
        cin >> a >> b;
        a--;b--;
        edges[i] = {a,b};
    }
    int sum = 0;
    vector<int> perm(n);
    iota(perm.begin(),perm.end(), 0);

    map<int,int> val;
    do{
        vector<int> pos(n);
        int cur = 0;
        int v = 0;

        for(int i = 0; i < n; i++){
            pos[perm[i]] = i; 
        }

        for(int i = 0; i < m; i++){
            int a,b;
            tie(a,b) = edges[i];

            if(pos[a] > pos[b]){
                cur += (1LL << i);
                v++;
            }
        }
        val[cur] = v;
        
    }while(next_permutation(perm.begin(),perm.end()));
    

    for(auto p : val){
        sum += p.second;
    }

    cout << sum << endl; 
}

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