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Submission #679583

# Submission time Handle Problem Language Result Execution time Memory
679583 2023-01-08T15:29:17 Z peijar Network (BOI15_net) C++17
100 / 100
 419 ms 46660 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int nbSommet;
  cin >> nbSommet;
  vector<vector<int>> adj(nbSommet);
  for (int i = 1; i < nbSommet; ++i) {
    int u, v;
    cin >> u >> v;
    --u, --v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }

  vector<int> feuilles;

  auto DFS = [&](auto dfs, int u, int p) -> void {
    if (adj[u].size() == 1)
      feuilles.push_back(u);
    for (int v : adj[u])
      if (v != p)
        dfs(dfs, v, u);
  };

  for (int u = 0; u < nbSommet; ++u)
    if (adj[u].size() > 1) {
      DFS(DFS, u, u);
      break;
    }

  int nbFeuilles = feuilles.size();
  int delta = (nbFeuilles + 1) / 2;
  cout << (nbFeuilles + 1) / 2 << endl;
  for (int i = 0; i < (nbFeuilles + 1) / 2; ++i)
    cout << 1 + feuilles[i] << ' ' << feuilles[(i + delta) % nbFeuilles] + 1
         << '\n';
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 220 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 320 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 220 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 320 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 428 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 1 ms 468 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 1 ms 212 KB Output is correct
36 Correct 1 ms 212 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 212 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 1 ms 212 KB Output is correct
48 Correct 1 ms 324 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 0 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 1 ms 324 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 320 KB Output is correct
56 Correct 0 ms 320 KB Output is correct
57 Correct 1 ms 340 KB Output is correct
58 Correct 1 ms 468 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 220 KB Output is correct
12 Correct 0 ms 320 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 1 ms 212 KB Output is correct
17 Correct 1 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 320 KB Output is correct
21 Correct 1 ms 212 KB Output is correct
22 Correct 1 ms 428 KB Output is correct
23 Correct 1 ms 468 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 340 KB Output is correct
27 Correct 1 ms 468 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 1 ms 468 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 1 ms 212 KB Output is correct
36 Correct 1 ms 212 KB Output is correct
37 Correct 1 ms 340 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 0 ms 212 KB Output is correct
40 Correct 0 ms 212 KB Output is correct
41 Correct 0 ms 212 KB Output is correct
42 Correct 1 ms 340 KB Output is correct
43 Correct 1 ms 340 KB Output is correct
44 Correct 1 ms 212 KB Output is correct
45 Correct 1 ms 340 KB Output is correct
46 Correct 1 ms 340 KB Output is correct
47 Correct 1 ms 212 KB Output is correct
48 Correct 1 ms 324 KB Output is correct
49 Correct 1 ms 340 KB Output is correct
50 Correct 0 ms 212 KB Output is correct
51 Correct 0 ms 212 KB Output is correct
52 Correct 0 ms 340 KB Output is correct
53 Correct 1 ms 324 KB Output is correct
54 Correct 0 ms 212 KB Output is correct
55 Correct 1 ms 320 KB Output is correct
56 Correct 0 ms 320 KB Output is correct
57 Correct 1 ms 340 KB Output is correct
58 Correct 1 ms 468 KB Output is correct
59 Correct 305 ms 39348 KB Output is correct
60 Correct 355 ms 43572 KB Output is correct
61 Correct 1 ms 212 KB Output is correct
62 Correct 1 ms 212 KB Output is correct
63 Correct 254 ms 34448 KB Output is correct
64 Correct 2 ms 724 KB Output is correct
65 Correct 9 ms 2644 KB Output is correct
66 Correct 105 ms 19108 KB Output is correct
67 Correct 419 ms 45108 KB Output is correct
68 Correct 402 ms 46660 KB Output is correct
69 Correct 5 ms 1728 KB Output is correct
70 Correct 62 ms 15312 KB Output is correct
71 Correct 242 ms 45824 KB Output is correct
72 Correct 263 ms 44340 KB Output is correct
73 Correct 64 ms 11540 KB Output is correct
74 Correct 367 ms 41112 KB Output is correct
75 Correct 20 ms 5208 KB Output is correct
76 Correct 252 ms 45268 KB Output is correct
77 Correct 276 ms 45496 KB Output is correct
78 Correct 29 ms 5192 KB Output is correct
79 Correct 400 ms 43580 KB Output is correct
80 Correct 2 ms 596 KB Output is correct
81 Correct 88 ms 14704 KB Output is correct
82 Correct 293 ms 43236 KB Output is correct
83 Correct 361 ms 41132 KB Output is correct
84 Correct 349 ms 41104 KB Output is correct
85 Correct 356 ms 41180 KB Output is correct
86 Correct 348 ms 43336 KB Output is correct
87 Correct 346 ms 43416 KB Output is correct