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Submission #940072

# Submission time Handle Problem Language Result Execution time Memory
940072 2024-03-07T05:03:39 Z vjudge1 Network (BOI15_net) C++17
100 / 100
 343 ms 41164 KB 
#include <bits/stdc++.h>
#define file_io freopen("input.txt", "r", stdin);freopen("output.txt", "w", stdout);
#define fast_io ios::sync_with_stdio(false);cin.tie(0);
#define what(x) cerr << #x << " is " << x << '\n';
#define kill(x) {cout << x << endl; return 0;}
#define all(x) (x).begin(), (x).end()
#define pii pair<int, int>
#define pb push_back
#define ll long long
#define F first
#define S second
const ll inf = 1e18, mod = 1e9 + 7, delta = 1e9 + 9, SQ = 450, P = 6065621;
 
using namespace std;
 
const int N = 5e5 + 10, LG = 40;
vector<int> adj[N], l;
 
void dfs (int v, int p = -1) {
  if (adj[v].size() == 1) l.pb(v);
  for (auto u: adj[v])
    if (u - p) dfs(u, v);
}
 
int main () {
  fast_io;
  int n;
  cin >> n;
  for (int i = 1; i < n; i++) {
    int u, v;
    cin >> u >> v;
    adj[u].pb(v);
    adj[v].pb(u);
  }
  dfs(1);
  cout << (l.size() + 1) / 2 << '\n';
  int t = (l.size() + 1) / 2;
  for (int i = 0; i < t; i++)
    cout << l[i] << ' ' << l[i + l.size() / 2] << '\n'; 
  return 0;
}

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 3 ms 12120 KB Output is correct
9 Correct 3 ms 12124 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12376 KB Output is correct
12 Correct 3 ms 12120 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12124 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 4 ms 12124 KB Output is correct
19 Correct 3 ms 12376 KB Output is correct
20 Correct 3 ms 12132 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 3 ms 12120 KB Output is correct
9 Correct 3 ms 12124 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12376 KB Output is correct
12 Correct 3 ms 12120 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12124 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 4 ms 12124 KB Output is correct
19 Correct 3 ms 12376 KB Output is correct
20 Correct 3 ms 12132 KB Output is correct
21 Correct 3 ms 12120 KB Output is correct
22 Correct 3 ms 12124 KB Output is correct
23 Correct 3 ms 12120 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 3 ms 12120 KB Output is correct
26 Correct 3 ms 12124 KB Output is correct
27 Correct 4 ms 12120 KB Output is correct
28 Correct 5 ms 12120 KB Output is correct
29 Correct 3 ms 12124 KB Output is correct
30 Correct 3 ms 12124 KB Output is correct
31 Correct 3 ms 12124 KB Output is correct
32 Correct 3 ms 12124 KB Output is correct
33 Correct 4 ms 12280 KB Output is correct
34 Correct 3 ms 12124 KB Output is correct
35 Correct 3 ms 12124 KB Output is correct
36 Correct 3 ms 12124 KB Output is correct
37 Correct 3 ms 12124 KB Output is correct
38 Correct 3 ms 12124 KB Output is correct
39 Correct 3 ms 12124 KB Output is correct
40 Correct 3 ms 12124 KB Output is correct
41 Correct 3 ms 12124 KB Output is correct
42 Correct 3 ms 12120 KB Output is correct
43 Correct 3 ms 12124 KB Output is correct
44 Correct 3 ms 12124 KB Output is correct
45 Correct 3 ms 12120 KB Output is correct
46 Correct 3 ms 12124 KB Output is correct
47 Correct 4 ms 12124 KB Output is correct
48 Correct 3 ms 12124 KB Output is correct
49 Correct 3 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 3 ms 12124 KB Output is correct
53 Correct 4 ms 12124 KB Output is correct
54 Correct 3 ms 12124 KB Output is correct
55 Correct 4 ms 12124 KB Output is correct
56 Correct 3 ms 12124 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 3 ms 12120 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 12120 KB Output is correct
2 Correct 3 ms 12120 KB Output is correct
3 Correct 3 ms 12124 KB Output is correct
4 Correct 3 ms 12124 KB Output is correct
5 Correct 4 ms 12124 KB Output is correct
6 Correct 3 ms 12124 KB Output is correct
7 Correct 3 ms 12120 KB Output is correct
8 Correct 3 ms 12120 KB Output is correct
9 Correct 3 ms 12124 KB Output is correct
10 Correct 3 ms 12124 KB Output is correct
11 Correct 3 ms 12376 KB Output is correct
12 Correct 3 ms 12120 KB Output is correct
13 Correct 3 ms 12124 KB Output is correct
14 Correct 3 ms 12124 KB Output is correct
15 Correct 3 ms 12124 KB Output is correct
16 Correct 3 ms 12124 KB Output is correct
17 Correct 3 ms 12124 KB Output is correct
18 Correct 4 ms 12124 KB Output is correct
19 Correct 3 ms 12376 KB Output is correct
20 Correct 3 ms 12132 KB Output is correct
21 Correct 3 ms 12120 KB Output is correct
22 Correct 3 ms 12124 KB Output is correct
23 Correct 3 ms 12120 KB Output is correct
24 Correct 4 ms 12124 KB Output is correct
25 Correct 3 ms 12120 KB Output is correct
26 Correct 3 ms 12124 KB Output is correct
27 Correct 4 ms 12120 KB Output is correct
28 Correct 5 ms 12120 KB Output is correct
29 Correct 3 ms 12124 KB Output is correct
30 Correct 3 ms 12124 KB Output is correct
31 Correct 3 ms 12124 KB Output is correct
32 Correct 3 ms 12124 KB Output is correct
33 Correct 4 ms 12280 KB Output is correct
34 Correct 3 ms 12124 KB Output is correct
35 Correct 3 ms 12124 KB Output is correct
36 Correct 3 ms 12124 KB Output is correct
37 Correct 3 ms 12124 KB Output is correct
38 Correct 3 ms 12124 KB Output is correct
39 Correct 3 ms 12124 KB Output is correct
40 Correct 3 ms 12124 KB Output is correct
41 Correct 3 ms 12124 KB Output is correct
42 Correct 3 ms 12120 KB Output is correct
43 Correct 3 ms 12124 KB Output is correct
44 Correct 3 ms 12124 KB Output is correct
45 Correct 3 ms 12120 KB Output is correct
46 Correct 3 ms 12124 KB Output is correct
47 Correct 4 ms 12124 KB Output is correct
48 Correct 3 ms 12124 KB Output is correct
49 Correct 3 ms 12124 KB Output is correct
50 Correct 3 ms 12124 KB Output is correct
51 Correct 3 ms 12124 KB Output is correct
52 Correct 3 ms 12124 KB Output is correct
53 Correct 4 ms 12124 KB Output is correct
54 Correct 3 ms 12124 KB Output is correct
55 Correct 4 ms 12124 KB Output is correct
56 Correct 3 ms 12124 KB Output is correct
57 Correct 3 ms 12124 KB Output is correct
58 Correct 3 ms 12120 KB Output is correct
59 Correct 231 ms 29972 KB Output is correct
60 Correct 253 ms 32112 KB Output is correct
61 Correct 3 ms 12124 KB Output is correct
62 Correct 3 ms 12124 KB Output is correct
63 Correct 202 ms 28232 KB Output is correct
64 Correct 5 ms 12632 KB Output is correct
65 Correct 9 ms 13660 KB Output is correct
66 Correct 65 ms 25556 KB Output is correct
67 Correct 333 ms 40220 KB Output is correct
68 Correct 317 ms 41164 KB Output is correct
69 Correct 6 ms 12888 KB Output is correct
70 Correct 48 ms 19288 KB Output is correct
71 Correct 161 ms 35124 KB Output is correct
72 Correct 192 ms 34404 KB Output is correct
73 Correct 43 ms 17364 KB Output is correct
74 Correct 263 ms 30996 KB Output is correct
75 Correct 16 ms 14556 KB Output is correct
76 Correct 230 ms 34776 KB Output is correct
77 Correct 173 ms 35300 KB Output is correct
78 Correct 17 ms 14684 KB Output is correct
79 Correct 343 ms 38672 KB Output is correct
80 Correct 4 ms 12380 KB Output is correct
81 Correct 59 ms 19276 KB Output is correct
82 Correct 211 ms 33228 KB Output is correct
83 Correct 271 ms 31136 KB Output is correct
84 Correct 266 ms 31036 KB Output is correct
85 Correct 287 ms 31300 KB Output is correct
86 Correct 272 ms 32300 KB Output is correct
87 Correct 275 ms 32196 KB Output is correct