| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 751168 |
2023-05-31T07:05:17 Z |
ljuba |
Network (BOI15_net) |
C++17 |
|
495 ms |
47664 KB |
#include <bits/stdc++.h>
using namespace std;
const int mxN = 5e5 + 12;
vector<int> adj[mxN];
vector<int> lisce;
void dfs(int s, int p = -1) {
if(adj[s].size() == 1) lisce.push_back(s);
for(auto e : adj[s]) {
if(e == p) continue;
dfs(e, s);
}
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
for(int i = 1; i < n; ++i) {
int u, v;
cin >> u >> v;
--u, --v;
adj[u].push_back(v);
adj[v].push_back(u);
}
dfs(0);
int vel = lisce.size();
cout << (vel + 1) / 2 << '\n';
for(int i = 0; i < (vel + 1) / 2; ++i) {
int x = lisce[i];
int y = lisce[(i + vel / 2) % vel];
cout << x + 1 << " " << y + 1 << '\n';
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 11 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11988 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 11 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12180 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 25 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12092 KB |
Output is correct |
| 27 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12068 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
9 ms |
12040 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 41 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 47 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 48 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 54 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12116 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12072 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 4 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 11 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12180 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 25 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12092 KB |
Output is correct |
| 27 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12068 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 35 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
9 ms |
12040 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 41 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 47 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 48 |
Correct |
6 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 54 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 59 |
Correct |
316 ms |
36040 KB |
Output is correct |
| 60 |
Correct |
378 ms |
38652 KB |
Output is correct |
| 61 |
Correct |
9 ms |
11988 KB |
Output is correct |
| 62 |
Correct |
6 ms |
11964 KB |
Output is correct |
| 63 |
Correct |
289 ms |
33496 KB |
Output is correct |
| 64 |
Correct |
8 ms |
12372 KB |
Output is correct |
| 65 |
Correct |
20 ms |
13828 KB |
Output is correct |
| 66 |
Correct |
112 ms |
27804 KB |
Output is correct |
| 67 |
Correct |
452 ms |
46900 KB |
Output is correct |
| 68 |
Correct |
495 ms |
47664 KB |
Output is correct |
| 69 |
Correct |
12 ms |
12884 KB |
Output is correct |
| 70 |
Correct |
85 ms |
21224 KB |
Output is correct |
| 71 |
Correct |
246 ms |
41784 KB |
Output is correct |
| 72 |
Correct |
267 ms |
40676 KB |
Output is correct |
| 73 |
Correct |
88 ms |
19064 KB |
Output is correct |
| 74 |
Correct |
359 ms |
37584 KB |
Output is correct |
| 75 |
Correct |
25 ms |
15244 KB |
Output is correct |
| 76 |
Correct |
265 ms |
41496 KB |
Output is correct |
| 77 |
Correct |
238 ms |
41620 KB |
Output is correct |
| 78 |
Correct |
30 ms |
15308 KB |
Output is correct |
| 79 |
Correct |
397 ms |
45144 KB |
Output is correct |
| 80 |
Correct |
9 ms |
12244 KB |
Output is correct |
| 81 |
Correct |
82 ms |
21300 KB |
Output is correct |
| 82 |
Correct |
303 ms |
39564 KB |
Output is correct |
| 83 |
Correct |
392 ms |
37688 KB |
Output is correct |
| 84 |
Correct |
342 ms |
37692 KB |
Output is correct |
| 85 |
Correct |
359 ms |
37716 KB |
Output is correct |
| 86 |
Correct |
358 ms |
38720 KB |
Output is correct |
| 87 |
Correct |
352 ms |
38736 KB |
Output is correct |
