| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 32314 |
2017-10-08T14:19:21 Z |
dqhungdl |
Network (BOI15_net) |
C++14 |
|
6 ms |
14380 KB |
#include <bits/stdc++.h>
using namespace std;
int n;
bool Free[500005];
vector<int> V,g[500005];
void DFS(int u)
{
Free[u]=true;
if(g[u].size()==1)
V.push_back(u);
for(int i=0;i<g[u].size();i++)
if(Free[g[u][i]]==false)
DFS(g[u][i]);
}
int main()
{
ios_base::sync_with_stdio(false);
//freopen("NET.INP","r",stdin);
cin>>n;
int u,v;
for(int i=1;i<n;i++)
{
cin>>u>>v;
g[u].push_back(v);
g[v].push_back(u);
}
DFS(1);
int tmp=V.size();
cout<<(tmp+1)/2<<"\n";
for(int i=0;i<=(tmp-1)/2;i++)
cout<<V[i]<<' '<<V[i+tmp/2]<<"\n";
}
Compilation message
net.cpp: In function 'void DFS(int)':
net.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<g[u].size();i++)
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 2 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 3 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 4 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 5 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 6 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 7 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 9 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 10 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 11 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 13 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 14 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 15 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 16 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 17 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 18 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 19 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 20 |
Correct |
0 ms |
14380 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 2 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 3 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 4 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 5 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 6 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 7 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 9 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 10 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 11 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 13 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 14 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 15 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 16 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 17 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 18 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 19 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 20 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 21 |
Correct |
6 ms |
14380 KB |
Output is correct |
| 22 |
Runtime error |
3 ms |
14380 KB |
Execution killed because of forbidden syscall writev (20) |
| 23 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 2 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 3 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 4 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 5 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 6 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 7 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 8 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 9 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 10 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 11 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 12 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 13 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 14 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 15 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 16 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 17 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 18 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 19 |
Correct |
3 ms |
14380 KB |
Output is correct |
| 20 |
Correct |
0 ms |
14380 KB |
Output is correct |
| 21 |
Correct |
6 ms |
14380 KB |
Output is correct |
| 22 |
Runtime error |
3 ms |
14380 KB |
Execution killed because of forbidden syscall writev (20) |
| 23 |
Halted |
0 ms |
0 KB |
- |
