Submission #446198

#	Time	Username	Problem	Language	Result	Execution time	Memory
446198		Haruto810198	Amusement Park (CEOI19_amusementpark)	C++17	0 / 100	1 ms	204 KiB

amusementpark

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define double long double

#define FOR(i,l,r,d) for(int i=(l);i<=(r);i+=(d))
#define szof(x) ((int)(x).size())

#define vi vector<int>
#define pii pair<int,int>

#define F first
#define S second

#define pb push_back
#define eb emplace_back
#define mkp make_pair

const int INF = 2147483647;
const int LNF = INF*INF;
const int MOD = 1000000007;
const int mod = 998244353;
const double eps = 1e-12;

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")

int n, m;

int edge[20][20];

vector<vi> per; /// permutations

int solve(vi arr){

    int ret = 0;
    int H[20];

    FOR(i, 1, n, 1){
        H[i] = arr[i-1];
    }

    FOR(i, 1, n, 1){
        FOR(j, 1, n, 1){
            if(edge[i][j] == 1 and H[i] > H[j]){
                ret++;
            }
        }
    }

    return ret;

}

signed main(){

    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>m;

    FOR(i, 1, n, 1){
        FOR(j, 1, n, 1){
            edge[i][j] = -1;
        }
    }

    FOR(i, 1, m, 1){
        int u, v;
        cin>>u>>v;
        edge[u][v] = 0;
        edge[v][u] = 1;
    }

    vi arr;
    FOR(i, 1, n, 1){
        arr.pb(i);
    }

    do{
        per.pb(arr);
    }while( next_permutation(arr.begin(), arr.end()) );

    int res = 0;
    for(vi arr : per){
        res += solve(arr);
    }

    cout<<res<<'\n';

    return 0;

}

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