| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 170903 |
2019-12-26T16:46:45 Z |
nafis_shifat |
Network (BOI15_net) |
C++14 |
|
1460 ms |
47796 KB |
#include<bits/stdc++.h>
#define pii pair<int,int>
#define ll long long
#define s second
using namespace std;
const int mxn=5e5+6;
vector<int> tree[mxn];
vector<int> lf;
int root=1;
void dfs(int cur,int prev)
{
if(tree[cur].size()==1)lf.push_back(cur);
for(int i:tree[cur])
{
if(i!=prev)
{
dfs(i,cur);
}
}
}
int main()
{
int n;
cin>>n;
for(int i=1;i<n;i++)
{
int u,v;
cin>>u>>v;
tree[u].push_back(v);
tree[v].push_back(u);
}
dfs(root,-1);
int r=lf.size();
cout<<(r+1)/2<<endl;
int md=(r+1)/2;
for(int i=0;i<md;i++)
{
if(i+md<r)
cout<<lf[i]<<" "<<lf[i+md]<<endl;
else
cout<<lf[i]<<" "<<lf[r-1]<<endl;
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
11996 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 9 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
11996 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 9 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
19 ms |
12136 KB |
Output is correct |
| 24 |
Correct |
20 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
18 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 29 |
Correct |
15 ms |
12168 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12028 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12052 KB |
Output is correct |
| 58 |
Correct |
17 ms |
12156 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
12 ms |
11996 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 9 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 22 |
Correct |
17 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
19 ms |
12136 KB |
Output is correct |
| 24 |
Correct |
20 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
18 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 29 |
Correct |
15 ms |
12168 KB |
Output is correct |
| 30 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
16 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 33 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 37 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 40 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12028 KB |
Output is correct |
| 53 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
15 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12052 KB |
Output is correct |
| 58 |
Correct |
17 ms |
12156 KB |
Output is correct |
| 59 |
Correct |
1155 ms |
36100 KB |
Output is correct |
| 60 |
Correct |
1329 ms |
38920 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 63 |
Correct |
1085 ms |
33636 KB |
Output is correct |
| 64 |
Correct |
18 ms |
12444 KB |
Output is correct |
| 65 |
Correct |
45 ms |
13992 KB |
Output is correct |
| 66 |
Correct |
328 ms |
27896 KB |
Output is correct |
| 67 |
Correct |
991 ms |
47028 KB |
Output is correct |
| 68 |
Correct |
1035 ms |
47796 KB |
Output is correct |
| 69 |
Correct |
50 ms |
12920 KB |
Output is correct |
| 70 |
Correct |
429 ms |
21352 KB |
Output is correct |
| 71 |
Correct |
1415 ms |
42056 KB |
Output is correct |
| 72 |
Correct |
1342 ms |
41044 KB |
Output is correct |
| 73 |
Correct |
346 ms |
19144 KB |
Output is correct |
| 74 |
Correct |
1231 ms |
38000 KB |
Output is correct |
| 75 |
Correct |
152 ms |
15252 KB |
Output is correct |
| 76 |
Correct |
1427 ms |
41744 KB |
Output is correct |
| 77 |
Correct |
1460 ms |
41844 KB |
Output is correct |
| 78 |
Correct |
101 ms |
15356 KB |
Output is correct |
| 79 |
Correct |
954 ms |
45212 KB |
Output is correct |
| 80 |
Correct |
24 ms |
12280 KB |
Output is correct |
| 81 |
Correct |
428 ms |
21352 KB |
Output is correct |
| 82 |
Correct |
1321 ms |
39620 KB |
Output is correct |
| 83 |
Correct |
1245 ms |
37736 KB |
Output is correct |
| 84 |
Correct |
1253 ms |
37732 KB |
Output is correct |
| 85 |
Correct |
1235 ms |
37828 KB |
Output is correct |
| 86 |
Correct |
1387 ms |
38848 KB |
Output is correct |
| 87 |
Correct |
1417 ms |
38892 KB |
Output is correct |
