| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 49590 |
2018-05-31T18:53:40 Z |
rzbt |
Network (BOI15_net) |
C++14 |
|
922 ms |
153276 KB |
#include <bits/stdc++.h>
using namespace std;
int n,in1,in2,tren,prethodni,duz,koren=0;
vector<vector<int> > drvo;
stack<pair<int,int> > dfs;
pair<int,int> vrh;
vector<int> listovi;
int main()
{
ios::sync_with_stdio(false);
cin>>n;
drvo.resize(n+1);
for(int i=1;i<n;i++)
{
cin>>in1>>in2;
drvo[in1].push_back(in2);
drvo[in2].push_back(in1);
}
if(n<=20)
{
if(n==1)
{
cout<<1<<endl<<1<<" "<<1;
}
if(n==2)
{
cout<<1<<endl<<1<<" "<<2;
return 0;
}
for(int i=1;i<=n;i++)
{
if(drvo[i].size()>1)
{
dfs.push(make_pair(i,0));
break;
}
}
while(!dfs.empty())
{
vrh=dfs.top();
dfs.pop();
tren=vrh.first;
prethodni=vrh.second;
duz=drvo[tren].size();
if(duz==1)
{
listovi.push_back(tren);
}
else
{
for(int i=0;i<duz;i++)
{
if(drvo[tren][i]!=prethodni)
{
dfs.push(make_pair(drvo[tren][i],tren));
}
}
}
}
duz=listovi.size();
cout<<(duz+1)/2<<endl;
for(int i=0;i<(duz+1)/2;i++)
{
if(i==duz-i-1)
{
cout<<listovi[0]<<" "<<listovi[i]<<endl;
}
else
{
cout<<listovi[i]<<" "<<listovi[i+(duz+1)/2]<<endl;
}
}
return 0;
}
for(int i=1;i<=n;i++)
{
if(drvo[i].size()>1)
{
dfs.push(make_pair(i,0));
break;
}
}
while(!dfs.empty())
{
vrh=dfs.top();
dfs.pop();
tren=vrh.first;
prethodni=vrh.second;
duz=drvo[tren].size();
if(duz==1)
{
listovi.push_back(tren);
}
else
{
for(int i=0;i<duz;i++)
{
if(drvo[tren][i]!=prethodni)
{
dfs.push(make_pair(drvo[tren][i],tren));
}
}
}
}
duz=listovi.size();
cout<<(duz+1)/2<<endl;
for(int i=0;i<(duz+1)/2;i++)
{
if(i==duz-i-1)
{
cout<<listovi[0]<<" "<<listovi[i]<<endl;
}
else
{
cout<<listovi[i]<<" "<<listovi[(duz+1)/2+i]<<endl;
}
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
412 KB |
Output is correct |
| 4 |
Correct |
2 ms |
488 KB |
Output is correct |
| 5 |
Correct |
2 ms |
548 KB |
Output is correct |
| 6 |
Correct |
2 ms |
548 KB |
Output is correct |
| 7 |
Correct |
2 ms |
620 KB |
Output is correct |
| 8 |
Correct |
2 ms |
620 KB |
Output is correct |
| 9 |
Correct |
2 ms |
740 KB |
Output is correct |
| 10 |
Correct |
2 ms |
740 KB |
Output is correct |
| 11 |
Correct |
3 ms |
740 KB |
Output is correct |
| 12 |
Correct |
2 ms |
740 KB |
Output is correct |
| 13 |
Correct |
2 ms |
740 KB |
Output is correct |
| 14 |
Correct |
2 ms |
740 KB |
Output is correct |
| 15 |
Correct |
2 ms |
740 KB |
Output is correct |
| 16 |
Correct |
2 ms |
740 KB |
Output is correct |
| 17 |
Correct |
2 ms |
740 KB |
Output is correct |
| 18 |
Correct |
2 ms |
740 KB |
Output is correct |
| 19 |
Correct |
2 ms |
860 KB |
Output is correct |
| 20 |
Correct |
2 ms |
860 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
412 KB |
Output is correct |
| 4 |
Correct |
2 ms |
488 KB |
Output is correct |
| 5 |
Correct |
2 ms |
548 KB |
Output is correct |
| 6 |
Correct |
2 ms |
548 KB |
Output is correct |
| 7 |
Correct |
2 ms |
620 KB |
Output is correct |
| 8 |
Correct |
2 ms |
620 KB |
Output is correct |
| 9 |
Correct |
2 ms |
740 KB |
Output is correct |
| 10 |
Correct |
2 ms |
740 KB |
Output is correct |
| 11 |
Correct |
3 ms |
740 KB |
Output is correct |
| 12 |
Correct |
2 ms |
740 KB |
Output is correct |
| 13 |
Correct |
2 ms |
740 KB |
Output is correct |
| 14 |
Correct |
2 ms |
740 KB |
Output is correct |
| 15 |
Correct |
2 ms |
740 KB |
Output is correct |
| 16 |
Correct |
2 ms |
740 KB |
Output is correct |
| 17 |
Correct |
2 ms |
740 KB |
Output is correct |
| 18 |
Correct |
2 ms |
740 KB |
Output is correct |
| 19 |
Correct |
2 ms |
860 KB |
Output is correct |
| 20 |
Correct |
2 ms |
860 KB |
Output is correct |
| 21 |
Correct |
2 ms |
860 KB |
Output is correct |
| 22 |
Correct |
6 ms |
876 KB |
Output is correct |
| 23 |
Correct |
5 ms |
912 KB |
Output is correct |
| 24 |
Correct |
5 ms |
912 KB |
Output is correct |
| 25 |
Correct |
5 ms |
1096 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1096 KB |
Output is correct |
| 27 |
Correct |
6 ms |
1096 KB |
Output is correct |
| 28 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 29 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 30 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 31 |
Correct |
5 ms |
1248 KB |
Output is correct |
| 32 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 33 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 34 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 35 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 36 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 37 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 38 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 39 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 40 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 41 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 42 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 43 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 44 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 45 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 46 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 47 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 48 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 49 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 50 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 51 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 52 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 53 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 54 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 55 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 56 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 57 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 58 |
Correct |
5 ms |
1376 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
412 KB |
Output is correct |
| 4 |
Correct |
2 ms |
488 KB |
Output is correct |
| 5 |
Correct |
2 ms |
548 KB |
Output is correct |
| 6 |
Correct |
2 ms |
548 KB |
Output is correct |
| 7 |
Correct |
2 ms |
620 KB |
Output is correct |
| 8 |
Correct |
2 ms |
620 KB |
Output is correct |
| 9 |
Correct |
2 ms |
740 KB |
Output is correct |
| 10 |
Correct |
2 ms |
740 KB |
Output is correct |
| 11 |
Correct |
3 ms |
740 KB |
Output is correct |
| 12 |
Correct |
2 ms |
740 KB |
Output is correct |
| 13 |
Correct |
2 ms |
740 KB |
Output is correct |
| 14 |
Correct |
2 ms |
740 KB |
Output is correct |
| 15 |
Correct |
2 ms |
740 KB |
Output is correct |
| 16 |
Correct |
2 ms |
740 KB |
Output is correct |
| 17 |
Correct |
2 ms |
740 KB |
Output is correct |
| 18 |
Correct |
2 ms |
740 KB |
Output is correct |
| 19 |
Correct |
2 ms |
860 KB |
Output is correct |
| 20 |
Correct |
2 ms |
860 KB |
Output is correct |
| 21 |
Correct |
2 ms |
860 KB |
Output is correct |
| 22 |
Correct |
6 ms |
876 KB |
Output is correct |
| 23 |
Correct |
5 ms |
912 KB |
Output is correct |
| 24 |
Correct |
5 ms |
912 KB |
Output is correct |
| 25 |
Correct |
5 ms |
1096 KB |
Output is correct |
| 26 |
Correct |
4 ms |
1096 KB |
Output is correct |
| 27 |
Correct |
6 ms |
1096 KB |
Output is correct |
| 28 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 29 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 30 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 31 |
Correct |
5 ms |
1248 KB |
Output is correct |
| 32 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 33 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 34 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 35 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 36 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 37 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 38 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 39 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 40 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 41 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 42 |
Correct |
3 ms |
1248 KB |
Output is correct |
| 43 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 44 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 45 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 46 |
Correct |
4 ms |
1248 KB |
Output is correct |
| 47 |
Correct |
2 ms |
1248 KB |
Output is correct |
| 48 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 49 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 50 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 51 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 52 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 53 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 54 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 55 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 56 |
Correct |
3 ms |
1292 KB |
Output is correct |
| 57 |
Correct |
2 ms |
1292 KB |
Output is correct |
| 58 |
Correct |
5 ms |
1376 KB |
Output is correct |
| 59 |
Correct |
678 ms |
36624 KB |
Output is correct |
| 60 |
Correct |
718 ms |
45800 KB |
Output is correct |
| 61 |
Correct |
2 ms |
45800 KB |
Output is correct |
| 62 |
Correct |
2 ms |
45800 KB |
Output is correct |
| 63 |
Correct |
559 ms |
45800 KB |
Output is correct |
| 64 |
Correct |
5 ms |
45800 KB |
Output is correct |
| 65 |
Correct |
16 ms |
45800 KB |
Output is correct |
| 66 |
Correct |
186 ms |
45800 KB |
Output is correct |
| 67 |
Correct |
654 ms |
55736 KB |
Output is correct |
| 68 |
Correct |
588 ms |
63240 KB |
Output is correct |
| 69 |
Correct |
28 ms |
63240 KB |
Output is correct |
| 70 |
Correct |
226 ms |
63240 KB |
Output is correct |
| 71 |
Correct |
733 ms |
82524 KB |
Output is correct |
| 72 |
Correct |
692 ms |
86244 KB |
Output is correct |
| 73 |
Correct |
169 ms |
86244 KB |
Output is correct |
| 74 |
Correct |
742 ms |
89420 KB |
Output is correct |
| 75 |
Correct |
70 ms |
89420 KB |
Output is correct |
| 76 |
Correct |
922 ms |
103508 KB |
Output is correct |
| 77 |
Correct |
790 ms |
109752 KB |
Output is correct |
| 78 |
Correct |
40 ms |
109752 KB |
Output is correct |
| 79 |
Correct |
602 ms |
109752 KB |
Output is correct |
| 80 |
Correct |
6 ms |
109752 KB |
Output is correct |
| 81 |
Correct |
225 ms |
109752 KB |
Output is correct |
| 82 |
Correct |
734 ms |
123716 KB |
Output is correct |
| 83 |
Correct |
679 ms |
125744 KB |
Output is correct |
| 84 |
Correct |
716 ms |
132264 KB |
Output is correct |
| 85 |
Correct |
701 ms |
138944 KB |
Output is correct |
| 86 |
Correct |
742 ms |
146760 KB |
Output is correct |
| 87 |
Correct |
782 ms |
153276 KB |
Output is correct |
