| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 564326 |
2022-05-19T00:50:55 Z |
SSRS |
Network (BOI15_net) |
C++14 |
|
867 ms |
56264 KB |
#include <bits/stdc++.h>
using namespace std;
void dfs(vector<vector<int>> &E , vector<bool> &used, vector<int> &L, int v = 0){
if (E[v].size() == 1){
L.push_back(v);
}
for (int w : E[v]){
if (!used[w]){
used[w] = true;
dfs(E, used, L, w);
}
}
}
int main(){
int n;
cin >> n;
vector<vector<int>> E(n);
for (int i = 0; i < n - 1; i++){
int a, b;
cin >> a >> b;
a--;
b--;
E[a].push_back(b);
E[b].push_back(a);
}
vector<bool> used(n, false);
used[0] = true;
vector<int> L;
dfs(E, used, L);
int cnt = L.size();
int k = (cnt + 1) / 2;
cout << k << endl;
for (int i = 0; i < k; i++){
cout << L[i] + 1 << ' ' << L[(i + k) % cnt] + 1 << endl;
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
304 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
300 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
300 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 |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
300 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
304 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
300 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
300 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 |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
300 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
212 KB |
Output is correct |
| 22 |
Correct |
3 ms |
340 KB |
Output is correct |
| 23 |
Correct |
3 ms |
340 KB |
Output is correct |
| 24 |
Correct |
3 ms |
340 KB |
Output is correct |
| 25 |
Correct |
4 ms |
436 KB |
Output is correct |
| 26 |
Correct |
2 ms |
340 KB |
Output is correct |
| 27 |
Correct |
2 ms |
340 KB |
Output is correct |
| 28 |
Correct |
3 ms |
440 KB |
Output is correct |
| 29 |
Correct |
2 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
300 KB |
Output is correct |
| 31 |
Correct |
3 ms |
340 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 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 |
1 ms |
296 KB |
Output is correct |
| 40 |
Correct |
1 ms |
212 KB |
Output is correct |
| 41 |
Correct |
1 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
212 KB |
Output is correct |
| 43 |
Correct |
2 ms |
340 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
1 ms |
212 KB |
Output is correct |
| 46 |
Correct |
2 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
212 KB |
Output is correct |
| 49 |
Correct |
2 ms |
340 KB |
Output is correct |
| 50 |
Correct |
1 ms |
212 KB |
Output is correct |
| 51 |
Correct |
0 ms |
212 KB |
Output is correct |
| 52 |
Correct |
1 ms |
212 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
1 ms |
300 KB |
Output is correct |
| 55 |
Correct |
1 ms |
212 KB |
Output is correct |
| 56 |
Correct |
1 ms |
300 KB |
Output is correct |
| 57 |
Correct |
1 ms |
304 KB |
Output is correct |
| 58 |
Correct |
4 ms |
340 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
304 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
300 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
300 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 |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
0 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
296 KB |
Output is correct |
| 16 |
Correct |
1 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
300 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
212 KB |
Output is correct |
| 22 |
Correct |
3 ms |
340 KB |
Output is correct |
| 23 |
Correct |
3 ms |
340 KB |
Output is correct |
| 24 |
Correct |
3 ms |
340 KB |
Output is correct |
| 25 |
Correct |
4 ms |
436 KB |
Output is correct |
| 26 |
Correct |
2 ms |
340 KB |
Output is correct |
| 27 |
Correct |
2 ms |
340 KB |
Output is correct |
| 28 |
Correct |
3 ms |
440 KB |
Output is correct |
| 29 |
Correct |
2 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
300 KB |
Output is correct |
| 31 |
Correct |
3 ms |
340 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 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 |
1 ms |
296 KB |
Output is correct |
| 40 |
Correct |
1 ms |
212 KB |
Output is correct |
| 41 |
Correct |
1 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
212 KB |
Output is correct |
| 43 |
Correct |
2 ms |
340 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
1 ms |
212 KB |
Output is correct |
| 46 |
Correct |
2 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
212 KB |
Output is correct |
| 49 |
Correct |
2 ms |
340 KB |
Output is correct |
| 50 |
Correct |
1 ms |
212 KB |
Output is correct |
| 51 |
Correct |
0 ms |
212 KB |
Output is correct |
| 52 |
Correct |
1 ms |
212 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
1 ms |
300 KB |
Output is correct |
| 55 |
Correct |
1 ms |
212 KB |
Output is correct |
| 56 |
Correct |
1 ms |
300 KB |
Output is correct |
| 57 |
Correct |
1 ms |
304 KB |
Output is correct |
| 58 |
Correct |
4 ms |
340 KB |
Output is correct |
| 59 |
Correct |
670 ms |
34824 KB |
Output is correct |
| 60 |
Correct |
788 ms |
38784 KB |
Output is correct |
| 61 |
Correct |
1 ms |
212 KB |
Output is correct |
| 62 |
Correct |
1 ms |
212 KB |
Output is correct |
| 63 |
Correct |
635 ms |
31264 KB |
Output is correct |
| 64 |
Correct |
4 ms |
980 KB |
Output is correct |
| 65 |
Correct |
19 ms |
3276 KB |
Output is correct |
| 66 |
Correct |
180 ms |
25708 KB |
Output is correct |
| 67 |
Correct |
640 ms |
55268 KB |
Output is correct |
| 68 |
Correct |
700 ms |
56264 KB |
Output is correct |
| 69 |
Correct |
20 ms |
1460 KB |
Output is correct |
| 70 |
Correct |
221 ms |
13360 KB |
Output is correct |
| 71 |
Correct |
785 ms |
41856 KB |
Output is correct |
| 72 |
Correct |
811 ms |
40720 KB |
Output is correct |
| 73 |
Correct |
191 ms |
10496 KB |
Output is correct |
| 74 |
Correct |
867 ms |
37668 KB |
Output is correct |
| 75 |
Correct |
91 ms |
4812 KB |
Output is correct |
| 76 |
Correct |
828 ms |
41624 KB |
Output is correct |
| 77 |
Correct |
756 ms |
41608 KB |
Output is correct |
| 78 |
Correct |
50 ms |
5376 KB |
Output is correct |
| 79 |
Correct |
632 ms |
52428 KB |
Output is correct |
| 80 |
Correct |
5 ms |
596 KB |
Output is correct |
| 81 |
Correct |
215 ms |
13568 KB |
Output is correct |
| 82 |
Correct |
745 ms |
39536 KB |
Output is correct |
| 83 |
Correct |
732 ms |
37788 KB |
Output is correct |
| 84 |
Correct |
726 ms |
37664 KB |
Output is correct |
| 85 |
Correct |
750 ms |
37624 KB |
Output is correct |
| 86 |
Correct |
775 ms |
38904 KB |
Output is correct |
| 87 |
Correct |
842 ms |
38768 KB |
Output is correct |
