| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 166920 |
2019-12-04T15:12:48 Z |
super_j6 |
Network (BOI15_net) |
C++14 |
|
660 ms |
52184 KB |
#include <iostream>
#include <cstdio>
#include <algorithm>
#include <vector>
using namespace std;
#define endl '\n'
#define pi pair<int, int>
const int maxn = 500000;
int n;
vector<int> graph[maxn];
vector<int> lf;
void dfs(int c, int p){
if(graph[c].size() == 1) lf.push_back(c + 1);
for(int i : graph[c]){
if(i == p) continue;
dfs(i, c);
}
}
int main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
cin >> n;
for(int i = 0; i < n - 1; i++){
int a, b;
cin >> a >> b;
a--, b--;
graph[a].push_back(b);
graph[b].push_back(a);
}
dfs(0, -1);
int k = (lf.size() + 1) / 2;
cout << k << endl;
for(int i = 0; i < k; i++) cout << lf[i] << " " << lf[i + lf.size() / 2] << endl;
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12052 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
17 ms |
12152 KB |
Output is correct |
| 10 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 20 |
Correct |
14 ms |
12024 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12052 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
17 ms |
12152 KB |
Output is correct |
| 10 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 20 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12280 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12156 KB |
Output is correct |
| 29 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12280 KB |
Output is correct |
| 32 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
14 ms |
12020 KB |
Output is correct |
| 35 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 36 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 37 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 43 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 45 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
15 ms |
12212 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 48 |
Correct |
14 ms |
12028 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12156 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12072 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 57 |
Correct |
14 ms |
12124 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12052 KB |
Output is correct |
| 8 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
17 ms |
12152 KB |
Output is correct |
| 10 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 13 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 15 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 16 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 20 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12280 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12156 KB |
Output is correct |
| 29 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12280 KB |
Output is correct |
| 32 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
14 ms |
12020 KB |
Output is correct |
| 35 |
Correct |
13 ms |
12156 KB |
Output is correct |
| 36 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 37 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 43 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 45 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 46 |
Correct |
15 ms |
12212 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 48 |
Correct |
14 ms |
12028 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 51 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12024 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12156 KB |
Output is correct |
| 54 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12072 KB |
Output is correct |
| 56 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 57 |
Correct |
14 ms |
12124 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 59 |
Correct |
448 ms |
36136 KB |
Output is correct |
| 60 |
Correct |
533 ms |
38884 KB |
Output is correct |
| 61 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 62 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 63 |
Correct |
388 ms |
33648 KB |
Output is correct |
| 64 |
Correct |
21 ms |
12664 KB |
Output is correct |
| 65 |
Correct |
30 ms |
14328 KB |
Output is correct |
| 66 |
Correct |
204 ms |
30716 KB |
Output is correct |
| 67 |
Correct |
660 ms |
51200 KB |
Output is correct |
| 68 |
Correct |
646 ms |
52184 KB |
Output is correct |
| 69 |
Correct |
21 ms |
13048 KB |
Output is correct |
| 70 |
Correct |
122 ms |
21348 KB |
Output is correct |
| 71 |
Correct |
373 ms |
42108 KB |
Output is correct |
| 72 |
Correct |
415 ms |
40836 KB |
Output is correct |
| 73 |
Correct |
112 ms |
19064 KB |
Output is correct |
| 74 |
Correct |
562 ms |
37868 KB |
Output is correct |
| 75 |
Correct |
42 ms |
15352 KB |
Output is correct |
| 76 |
Correct |
393 ms |
41832 KB |
Output is correct |
| 77 |
Correct |
374 ms |
41680 KB |
Output is correct |
| 78 |
Correct |
44 ms |
15612 KB |
Output is correct |
| 79 |
Correct |
627 ms |
48908 KB |
Output is correct |
| 80 |
Correct |
16 ms |
12360 KB |
Output is correct |
| 81 |
Correct |
130 ms |
21364 KB |
Output is correct |
| 82 |
Correct |
467 ms |
39604 KB |
Output is correct |
| 83 |
Correct |
543 ms |
37796 KB |
Output is correct |
| 84 |
Correct |
542 ms |
37868 KB |
Output is correct |
| 85 |
Correct |
524 ms |
37912 KB |
Output is correct |
| 86 |
Correct |
500 ms |
38864 KB |
Output is correct |
| 87 |
Correct |
543 ms |
38892 KB |
Output is correct |
