| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 109404 |
2019-05-06T11:54:57 Z |
IVIosab |
Network (BOI15_net) |
C++17 |
|
766 ms |
47708 KB |
#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> adj(500005);
vector<int> leafs;
void dfs(int curn,int prev){
if(adj[curn].size()==1){
leafs.push_back(curn);
}
for(int i=0;i<adj[curn].size();i++){
if(adj[curn][i]!=prev){
dfs(adj[curn][i],curn);
}
}
}
int main()
{
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin>>n;
for(int i=0;i<n-1;i++){
int a,b;
cin>>a>>b;
adj[a].push_back(b);
adj[b].push_back(a);
}
dfs(1,-1);
if(leafs.size()%2==0){
cout<<leafs.size()/2<<"\n";
for(int i=0;i<leafs.size()/2;i++){
cout<<leafs[i]<<" "<<leafs[i+leafs.size()/2]<<"\n";
}
}
else{
cout<<leafs.size()/2+1<<"\n";
for(int i=0;i<leafs.size()/2;i++){
cout<<leafs[i]<<" "<<leafs[i+leafs.size()/2+1]<<"\n";
}
cout<<leafs[leafs.size()/2]<<" 1\n";
}
return 0;
}
Compilation message
net.cpp: In function 'void dfs(int, int)':
net.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<adj[curn].size();i++){
~^~~~~~~~~~~~~~~~~
net.cpp: In function 'int main()':
net.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<leafs.size()/2;i++){
~^~~~~~~~~~~~~~~
net.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<leafs.size()/2;i++){
~^~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 2 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12076 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 2 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12076 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
18 ms |
12132 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 36 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 37 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 40 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 42 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 45 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 51 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
15 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 2 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 4 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 7 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 8 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 9 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 12 |
Correct |
14 ms |
12076 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 18 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 19 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 20 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
18 ms |
12132 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 27 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 31 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
16 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 36 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 37 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 40 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 42 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 43 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 45 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 46 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 48 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 51 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 56 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 58 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 59 |
Correct |
505 ms |
36092 KB |
Output is correct |
| 60 |
Correct |
660 ms |
38948 KB |
Output is correct |
| 61 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 63 |
Correct |
402 ms |
33612 KB |
Output is correct |
| 64 |
Correct |
17 ms |
12544 KB |
Output is correct |
| 65 |
Correct |
35 ms |
13944 KB |
Output is correct |
| 66 |
Correct |
221 ms |
28024 KB |
Output is correct |
| 67 |
Correct |
724 ms |
46968 KB |
Output is correct |
| 68 |
Correct |
766 ms |
47708 KB |
Output is correct |
| 69 |
Correct |
28 ms |
12928 KB |
Output is correct |
| 70 |
Correct |
125 ms |
21328 KB |
Output is correct |
| 71 |
Correct |
458 ms |
41860 KB |
Output is correct |
| 72 |
Correct |
446 ms |
40804 KB |
Output is correct |
| 73 |
Correct |
139 ms |
19064 KB |
Output is correct |
| 74 |
Correct |
597 ms |
37828 KB |
Output is correct |
| 75 |
Correct |
48 ms |
15352 KB |
Output is correct |
| 76 |
Correct |
427 ms |
41784 KB |
Output is correct |
| 77 |
Correct |
493 ms |
41712 KB |
Output is correct |
| 78 |
Correct |
57 ms |
15352 KB |
Output is correct |
| 79 |
Correct |
695 ms |
45180 KB |
Output is correct |
| 80 |
Correct |
17 ms |
12288 KB |
Output is correct |
| 81 |
Correct |
181 ms |
21336 KB |
Output is correct |
| 82 |
Correct |
534 ms |
39688 KB |
Output is correct |
| 83 |
Correct |
603 ms |
37900 KB |
Output is correct |
| 84 |
Correct |
622 ms |
37828 KB |
Output is correct |
| 85 |
Correct |
561 ms |
37744 KB |
Output is correct |
| 86 |
Correct |
588 ms |
38764 KB |
Output is correct |
| 87 |
Correct |
555 ms |
38824 KB |
Output is correct |
