Submission #1092800

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092800		juicy	Paths (BOI18_paths)	C++17	100 / 100	240 ms	70776 KiB

paths

#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);

  int n, m, k; cin >> n >> m >> k;
  vector<int> c(n);
  for (int i = 0; i < n; ++i) {
    cin >> c[i]; --c[i];
  }
  vector<vector<int>> g(n);
  while (m--) {
    int u, v; cin >> u >> v; --u, --v;
    g[u].push_back(v);
    g[v].push_back(u);
  }
  long long res = 0;
  vector dp(n, vector<long long>(1 << k));
  for (int i = 0; i < n; ++i) {
    dp[i][1 << c[i]] = 1;
  }
  for (int m = 1; m < 1 << k; ++m) {
    for (int i = 0; i < n; ++i) {
      if (dp[i][m]) {
        for (int j : g[i]) {
          if (!(m >> c[j] & 1)) {
            dp[j][m + (1 << c[j])] += dp[i][m];
          }
        }
        if (__builtin_popcount(m) > 1) {
          res += dp[i][m];
        }
      }
    }
  }
  cout << res;
  return 0;
}

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 27 / 27
• Subtask 4: 30 / 30