# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
91040 |
2018-12-25T20:49:41 Z |
sjhuang26 |
Network (BOI15_net) |
C++14 |
|
832 ms |
34832 KB |
#include<iostream>
#include<vector>
using namespace std;
vector<int>s;
vector<vector<int>>t;//1 IDX
bool f[500000]={};
int N;
void dfs(int u){
if(f[u])return;
f[u]=1;
if(t[u].size()==1)s.push_back(u);
for(int&i:t[u])dfs(i);
}
int main(){
cin>>N;
for(int i=0;i<=N;++i)t.push_back(vector<int>());
for(int i=0;i<N-1;++i){
int a,b;cin>>a>>b;
t[a].push_back(b);
t[b].push_back(a);
}
dfs(1);
int k=s.size();
if(k%2){
cout<<k/2+1<<'\n';
for(int i=0;i<k/2;++i){
cout<<s[i]<<' '<<s[i+k/2+1]<<'\n';
}
cout<<s[k/2]<<' '<<1<<'\n';
}else{
cout<<k/2<<'\n';
for(int i=0;i<k/2;++i){
cout<<s[i]<<' '<<s[i+k/2]<<'\n';
}
}
// free memory
vector<vector<int>>().swap(t);
vector<int>().swap(s);
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
480 KB |
Output is correct |
3 |
Correct |
2 ms |
504 KB |
Output is correct |
4 |
Correct |
2 ms |
544 KB |
Output is correct |
5 |
Correct |
2 ms |
544 KB |
Output is correct |
6 |
Correct |
2 ms |
544 KB |
Output is correct |
7 |
Correct |
2 ms |
544 KB |
Output is correct |
8 |
Correct |
2 ms |
544 KB |
Output is correct |
9 |
Correct |
2 ms |
544 KB |
Output is correct |
10 |
Correct |
2 ms |
544 KB |
Output is correct |
11 |
Correct |
2 ms |
600 KB |
Output is correct |
12 |
Correct |
2 ms |
600 KB |
Output is correct |
13 |
Correct |
2 ms |
608 KB |
Output is correct |
14 |
Correct |
2 ms |
608 KB |
Output is correct |
15 |
Correct |
2 ms |
608 KB |
Output is correct |
16 |
Correct |
2 ms |
608 KB |
Output is correct |
17 |
Correct |
2 ms |
608 KB |
Output is correct |
18 |
Correct |
2 ms |
608 KB |
Output is correct |
19 |
Correct |
2 ms |
608 KB |
Output is correct |
20 |
Correct |
2 ms |
608 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
480 KB |
Output is correct |
3 |
Correct |
2 ms |
504 KB |
Output is correct |
4 |
Correct |
2 ms |
544 KB |
Output is correct |
5 |
Correct |
2 ms |
544 KB |
Output is correct |
6 |
Correct |
2 ms |
544 KB |
Output is correct |
7 |
Correct |
2 ms |
544 KB |
Output is correct |
8 |
Correct |
2 ms |
544 KB |
Output is correct |
9 |
Correct |
2 ms |
544 KB |
Output is correct |
10 |
Correct |
2 ms |
544 KB |
Output is correct |
11 |
Correct |
2 ms |
600 KB |
Output is correct |
12 |
Correct |
2 ms |
600 KB |
Output is correct |
13 |
Correct |
2 ms |
608 KB |
Output is correct |
14 |
Correct |
2 ms |
608 KB |
Output is correct |
15 |
Correct |
2 ms |
608 KB |
Output is correct |
16 |
Correct |
2 ms |
608 KB |
Output is correct |
17 |
Correct |
2 ms |
608 KB |
Output is correct |
18 |
Correct |
2 ms |
608 KB |
Output is correct |
19 |
Correct |
2 ms |
608 KB |
Output is correct |
20 |
Correct |
2 ms |
608 KB |
Output is correct |
21 |
Correct |
2 ms |
608 KB |
Output is correct |
22 |
Correct |
3 ms |
736 KB |
Output is correct |
23 |
Correct |
3 ms |
736 KB |
Output is correct |
24 |
Correct |
3 ms |
852 KB |
Output is correct |
25 |
Correct |
3 ms |
852 KB |
Output is correct |
26 |
Correct |
3 ms |
852 KB |
Output is correct |
27 |
Correct |
3 ms |
852 KB |
Output is correct |
28 |
Correct |
3 ms |
852 KB |
Output is correct |
29 |
Correct |
3 ms |
852 KB |
Output is correct |
30 |
Correct |
2 ms |
852 KB |
Output is correct |
31 |
Correct |
3 ms |
852 KB |
Output is correct |
32 |
Correct |
2 ms |
852 KB |
Output is correct |
33 |
Correct |
2 ms |
852 KB |
Output is correct |
34 |
Correct |
2 ms |
852 KB |
Output is correct |
35 |
Correct |
2 ms |
852 KB |
Output is correct |
36 |
Correct |
2 ms |
852 KB |
Output is correct |
37 |
Correct |
2 ms |
852 KB |
Output is correct |
38 |
Correct |
3 ms |
852 KB |
Output is correct |
39 |
Correct |
2 ms |
852 KB |
Output is correct |
40 |
Correct |
2 ms |
852 KB |
Output is correct |
41 |
Correct |
2 ms |
852 KB |
Output is correct |
42 |
Correct |
2 ms |
852 KB |
Output is correct |
43 |
Correct |
2 ms |
852 KB |
Output is correct |
44 |
Correct |
2 ms |
852 KB |
Output is correct |
45 |
Correct |
2 ms |
852 KB |
Output is correct |
46 |
Correct |
2 ms |
852 KB |
Output is correct |
47 |
Correct |
2 ms |
852 KB |
Output is correct |
48 |
Correct |
2 ms |
852 KB |
Output is correct |
49 |
Correct |
3 ms |
852 KB |
Output is correct |
50 |
Correct |
2 ms |
852 KB |
Output is correct |
51 |
Correct |
2 ms |
852 KB |
Output is correct |
52 |
Correct |
2 ms |
852 KB |
Output is correct |
53 |
Correct |
2 ms |
852 KB |
Output is correct |
54 |
Correct |
2 ms |
852 KB |
Output is correct |
55 |
Correct |
2 ms |
852 KB |
Output is correct |
56 |
Correct |
2 ms |
852 KB |
Output is correct |
57 |
Correct |
2 ms |
852 KB |
Output is correct |
58 |
Correct |
3 ms |
852 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
480 KB |
Output is correct |
3 |
Correct |
2 ms |
504 KB |
Output is correct |
4 |
Correct |
2 ms |
544 KB |
Output is correct |
5 |
Correct |
2 ms |
544 KB |
Output is correct |
6 |
Correct |
2 ms |
544 KB |
Output is correct |
7 |
Correct |
2 ms |
544 KB |
Output is correct |
8 |
Correct |
2 ms |
544 KB |
Output is correct |
9 |
Correct |
2 ms |
544 KB |
Output is correct |
10 |
Correct |
2 ms |
544 KB |
Output is correct |
11 |
Correct |
2 ms |
600 KB |
Output is correct |
12 |
Correct |
2 ms |
600 KB |
Output is correct |
13 |
Correct |
2 ms |
608 KB |
Output is correct |
14 |
Correct |
2 ms |
608 KB |
Output is correct |
15 |
Correct |
2 ms |
608 KB |
Output is correct |
16 |
Correct |
2 ms |
608 KB |
Output is correct |
17 |
Correct |
2 ms |
608 KB |
Output is correct |
18 |
Correct |
2 ms |
608 KB |
Output is correct |
19 |
Correct |
2 ms |
608 KB |
Output is correct |
20 |
Correct |
2 ms |
608 KB |
Output is correct |
21 |
Correct |
2 ms |
608 KB |
Output is correct |
22 |
Correct |
3 ms |
736 KB |
Output is correct |
23 |
Correct |
3 ms |
736 KB |
Output is correct |
24 |
Correct |
3 ms |
852 KB |
Output is correct |
25 |
Correct |
3 ms |
852 KB |
Output is correct |
26 |
Correct |
3 ms |
852 KB |
Output is correct |
27 |
Correct |
3 ms |
852 KB |
Output is correct |
28 |
Correct |
3 ms |
852 KB |
Output is correct |
29 |
Correct |
3 ms |
852 KB |
Output is correct |
30 |
Correct |
2 ms |
852 KB |
Output is correct |
31 |
Correct |
3 ms |
852 KB |
Output is correct |
32 |
Correct |
2 ms |
852 KB |
Output is correct |
33 |
Correct |
2 ms |
852 KB |
Output is correct |
34 |
Correct |
2 ms |
852 KB |
Output is correct |
35 |
Correct |
2 ms |
852 KB |
Output is correct |
36 |
Correct |
2 ms |
852 KB |
Output is correct |
37 |
Correct |
2 ms |
852 KB |
Output is correct |
38 |
Correct |
3 ms |
852 KB |
Output is correct |
39 |
Correct |
2 ms |
852 KB |
Output is correct |
40 |
Correct |
2 ms |
852 KB |
Output is correct |
41 |
Correct |
2 ms |
852 KB |
Output is correct |
42 |
Correct |
2 ms |
852 KB |
Output is correct |
43 |
Correct |
2 ms |
852 KB |
Output is correct |
44 |
Correct |
2 ms |
852 KB |
Output is correct |
45 |
Correct |
2 ms |
852 KB |
Output is correct |
46 |
Correct |
2 ms |
852 KB |
Output is correct |
47 |
Correct |
2 ms |
852 KB |
Output is correct |
48 |
Correct |
2 ms |
852 KB |
Output is correct |
49 |
Correct |
3 ms |
852 KB |
Output is correct |
50 |
Correct |
2 ms |
852 KB |
Output is correct |
51 |
Correct |
2 ms |
852 KB |
Output is correct |
52 |
Correct |
2 ms |
852 KB |
Output is correct |
53 |
Correct |
2 ms |
852 KB |
Output is correct |
54 |
Correct |
2 ms |
852 KB |
Output is correct |
55 |
Correct |
2 ms |
852 KB |
Output is correct |
56 |
Correct |
2 ms |
852 KB |
Output is correct |
57 |
Correct |
2 ms |
852 KB |
Output is correct |
58 |
Correct |
3 ms |
852 KB |
Output is correct |
59 |
Correct |
708 ms |
31688 KB |
Output is correct |
60 |
Incorrect |
832 ms |
34832 KB |
Invalid number of links. |
61 |
Halted |
0 ms |
0 KB |
- |