| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 76788 |
2018-09-18T03:46:48 Z |
shoemakerjo |
Network (BOI15_net) |
C++14 |
|
749 ms |
72480 KB |
#include <bits/stdc++.h>
using namespace std;
#define maxn 500010
int n;
vector<vector<int>> adj(maxn);
vector<int> leaves;
void dfs(int u, int p) {
if (adj[u].size() == 1) leaves.push_back(u);
for (int v : adj[u]) {
if (v != p) dfs(v, u);
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
int a, b;
for (int i = 0; i < n-1; i++) {
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
for (int i = 1; i <= n; i++) {
if (adj[i].size() != 1 || i == n) {
dfs(i, -1);
break;
}
}
cout << (leaves.size()+1)/2 << endl;
for (int i = 0; i + leaves.size()/2 < leaves.size(); i++) {
cout << leaves[i] << " " << leaves[i + leaves.size()/2] << endl;
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12276 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
31 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12436 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12276 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
31 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12436 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12436 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12472 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12492 KB |
Output is correct |
| 24 |
Correct |
19 ms |
12528 KB |
Output is correct |
| 25 |
Correct |
15 ms |
12564 KB |
Output is correct |
| 26 |
Correct |
14 ms |
12580 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12592 KB |
Output is correct |
| 28 |
Correct |
15 ms |
12652 KB |
Output is correct |
| 29 |
Correct |
15 ms |
12712 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12712 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12712 KB |
Output is correct |
| 32 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 33 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 34 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12712 KB |
Output is correct |
| 36 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12728 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12736 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12756 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12760 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12760 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12772 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12776 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12776 KB |
Output is correct |
| 48 |
Correct |
15 ms |
12788 KB |
Output is correct |
| 49 |
Correct |
15 ms |
12792 KB |
Output is correct |
| 50 |
Correct |
15 ms |
12792 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12792 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12824 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12824 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12824 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12832 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12832 KB |
Output is correct |
| 57 |
Correct |
18 ms |
12840 KB |
Output is correct |
| 58 |
Correct |
15 ms |
12848 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 2 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 3 |
Correct |
13 ms |
12272 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12272 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12276 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 11 |
Correct |
31 ms |
12420 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 17 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12420 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12420 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12436 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12436 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12472 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12492 KB |
Output is correct |
| 24 |
Correct |
19 ms |
12528 KB |
Output is correct |
| 25 |
Correct |
15 ms |
12564 KB |
Output is correct |
| 26 |
Correct |
14 ms |
12580 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12592 KB |
Output is correct |
| 28 |
Correct |
15 ms |
12652 KB |
Output is correct |
| 29 |
Correct |
15 ms |
12712 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12712 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12712 KB |
Output is correct |
| 32 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 33 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 34 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12712 KB |
Output is correct |
| 36 |
Correct |
13 ms |
12712 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12728 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12736 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12736 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12756 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12760 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12760 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12772 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12776 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12776 KB |
Output is correct |
| 48 |
Correct |
15 ms |
12788 KB |
Output is correct |
| 49 |
Correct |
15 ms |
12792 KB |
Output is correct |
| 50 |
Correct |
15 ms |
12792 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12792 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12824 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12824 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12824 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12832 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12832 KB |
Output is correct |
| 57 |
Correct |
18 ms |
12840 KB |
Output is correct |
| 58 |
Correct |
15 ms |
12848 KB |
Output is correct |
| 59 |
Correct |
638 ms |
36276 KB |
Output is correct |
| 60 |
Correct |
731 ms |
45104 KB |
Output is correct |
| 61 |
Correct |
14 ms |
45104 KB |
Output is correct |
| 62 |
Correct |
12 ms |
45104 KB |
Output is correct |
| 63 |
Correct |
616 ms |
46476 KB |
Output is correct |
| 64 |
Correct |
16 ms |
46476 KB |
Output is correct |
| 65 |
Correct |
26 ms |
46476 KB |
Output is correct |
| 66 |
Correct |
192 ms |
46476 KB |
Output is correct |
| 67 |
Correct |
544 ms |
67856 KB |
Output is correct |
| 68 |
Correct |
608 ms |
72480 KB |
Output is correct |
| 69 |
Correct |
32 ms |
72480 KB |
Output is correct |
| 70 |
Correct |
219 ms |
72480 KB |
Output is correct |
| 71 |
Correct |
743 ms |
72480 KB |
Output is correct |
| 72 |
Correct |
729 ms |
72480 KB |
Output is correct |
| 73 |
Correct |
168 ms |
72480 KB |
Output is correct |
| 74 |
Correct |
718 ms |
72480 KB |
Output is correct |
| 75 |
Correct |
79 ms |
72480 KB |
Output is correct |
| 76 |
Correct |
722 ms |
72480 KB |
Output is correct |
| 77 |
Correct |
724 ms |
72480 KB |
Output is correct |
| 78 |
Correct |
51 ms |
72480 KB |
Output is correct |
| 79 |
Correct |
530 ms |
72480 KB |
Output is correct |
| 80 |
Correct |
17 ms |
72480 KB |
Output is correct |
| 81 |
Correct |
210 ms |
72480 KB |
Output is correct |
| 82 |
Correct |
733 ms |
72480 KB |
Output is correct |
| 83 |
Correct |
726 ms |
72480 KB |
Output is correct |
| 84 |
Correct |
715 ms |
72480 KB |
Output is correct |
| 85 |
Correct |
689 ms |
72480 KB |
Output is correct |
| 86 |
Correct |
737 ms |
72480 KB |
Output is correct |
| 87 |
Correct |
749 ms |
72480 KB |
Output is correct |
