Submission #757783

#	Time	Username	Problem	Language	Result	Execution time	Memory
757783		taher	Senior Postmen (BOI14_postmen)	C++17	100 / 100	484 ms	112264 KiB

postmen

#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<vector<int>> adj(n);
  vector<array<int, 2>> edges;
  for (int i = 0; i < m; i++) {
    int u, v;
    cin >> u >> v;
    --u, --v;
    adj[u].push_back(i);
    adj[v].push_back(i);
    edges.push_back({u, v});
  }
  vector<vector<int>> tours;
  vector<bool> visited(m);
  vector<int> sBefore(n);
  vector<int> v;
  function<void(int)> Euler = [&](int head) {
    while ((int) adj[head].size() > 0) {

      auto u = adj[head].back();
      adj[head].pop_back();

      v.push_back(head);
      sBefore[head] += 1;
      
      if (!visited[u]) {
        visited[u] = true;
        int nxt = head ^ edges[u][0] ^ edges[u][1];
        if (sBefore[nxt]) {
          vector<int> cur;
          int p = -1;
          do {
            cur.push_back(1 + v.back());
            p = v.back();
            sBefore[p] -= 1;
            v.pop_back();
          } while (p != nxt);
          tours.push_back(cur);
        } 
        Euler(nxt);
      }

      if ((int) v.size() > 0 && v.back() == head) {
        v.pop_back();
        sBefore[head] -= 1;
      }
    }
    return ;
  };

  Euler(0);

  for (int i = 0; i < (int) tours.size(); i++) {
    for (int j = 0; j < (int) tours[i].size(); j++) {
      cout << tours[i][j] << " \n"[j == (int) tours[i].size() - 1];
    }
  }
  return 0;
}

• Subtask 1: 38 / 38
• Subtask 2: 17 / 17
• Subtask 3: 45 / 45