Submission #1089738

#	Time	Username	Problem	Language	Result	Execution time	Memory
1089738		juicy	Amusement Park (CEOI19_amusementpark)	C++17	0 / 100	0 ms	348 KiB

amusementpark

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  const int M = 998244353;

  auto add = [&](int &x, int y) {
    if ((x += y) >= M) {
      x -= M;
    }
  };

  int n, m; cin >> n >> m;
  vector<vector<array<int, 2>>> g(n);
  while (m--) {
    int u, v; cin >> u >> v; --u, --v;
    g[u].push_back({v, 1});
    g[v].push_back({u, 0});
  }
  vector<int> dp(1 << n), cnt(1 << n);
  dp[0] = 0;
  cnt[0] = 1;
  for (int i = 0; i < 1 << n; ++i) {
    for (int j = 0; j < n; ++j) {
      if (!(i >> j & 1)) {
        int c = 0;
        for (auto [k, x] : g[j]) {
          if (i >> k & 1) {
            c += x;
          }
        }
        int l = i | 1 << j;
        add(dp[l], dp[i]);
        add(dp[l], (long long) cnt[i] * c % M);
        add(cnt[l], cnt[i]);
      }
    }
  }
  cout << dp.back();
  return 0;
}

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