Submission #1033414

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033414		codefox	Amusement Park (CEOI19_amusementpark)	C++14	7 / 100	1 ms	360 KiB

amusementpark

#include <bits/stdc++.h>

using namespace std;

#pragma GCC target("popcnt")
#pragma GCC optimize("Ofast")

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

const int mod = 998244353;

int32_t main()
{
    int n, m;
    cin >> n >> m;
    vector<bitset<20>> graph(n, 0);
    vector<bitset<20>> dgraph(n, 0);
    for (int i = 0; i < m; i++)
    {
        int a, b;
        cin >> a >> b;
        a--; b--;
        graph[a][b] = 1;
        dgraph[a][b] = 1;
        dgraph[b][a] = 1;
    }
    int N = 1<<n;
    N*=32;
    vector<pii> dp(N, {0,0});
    for(int i = 0; i< n; i++) dp[(1<<i)*32+i] = {1, 0};
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < n; j++)
        {
            int ii = i/32;
            int ij = i%32;
            if (ij >= n) continue;
            if (ii&(1<<j)) continue;
            int d = (graph[j]&(bitset<20>(ii))).count();
            //int dd = (dgraph[j]&(bitset<20>(i))).count();
            int nj = (ii+(1<<j))*32+j;
            if (dgraph[j][ij])
            {
                dp[nj].first += dp[i].first;
                dp[nj].first%=mod;
                dp[nj].second += dp[i].second+dp[i].first*d;
                dp[nj].second%=mod;
            }
            else if (ij<j)
            {
                dp[nj].first += dp[i].first;
                dp[nj].first%=mod;
                dp[nj].second += dp[i].second+dp[i].first*d;
                dp[nj].second%=mod;
            }
        }
    }
    int sol = 0;
    for (int i = N-32; i < N; i++) sol += dp[i].second;
    cout << sol%mod;
    return 0;
}

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