| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 108711 |
2019-05-01T06:34:57 Z |
Mahdi_Jfri |
Network (BOI15_net) |
C++14 |
|
844 ms |
41416 KB |
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int maxn = 5e5 + 20;
vector<int> adj[maxn] , tmp;
void dfs(int v , int p = -1)
{
if((int)adj[v].size() == 1)
tmp.pb(v);
for(auto u : adj[v])
if(u != p)
dfs(u , v);
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
for(int i = 0; i < n - 1; i++)
{
int a , b;
cin >> a >> b;
a-- , b--;
adj[a].pb(b);
adj[b].pb(a);
}
int root = -1;
for(int i = 0; i < n; i++)
if((int)adj[i].size() != 1)
{
root = i;
dfs(i);
break;
}
int k = tmp.size();
cout << (k + 1) / 2 << endl;
for(int i = 0; i < (k + 1) / 2; i++)
cout << tmp[i] + 1 << " " << tmp[i + k / 2] + 1 << endl;
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:39:6: warning: variable 'root' set but not used [-Wunused-but-set-variable]
int root = -1;
^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 12 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
11904 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
15 ms |
12004 KB |
Output is correct |
| 20 |
Correct |
13 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 12 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
11904 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
15 ms |
12004 KB |
Output is correct |
| 20 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 23 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 25 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12068 KB |
Output is correct |
| 27 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 31 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
13 ms |
12100 KB |
Output is correct |
| 36 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 48 |
Correct |
15 ms |
12120 KB |
Output is correct |
| 49 |
Correct |
18 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 56 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 58 |
Correct |
17 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 2 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 3 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 4 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 5 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 6 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 7 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 10 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 12 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 13 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 15 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 17 |
Correct |
14 ms |
11904 KB |
Output is correct |
| 18 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 19 |
Correct |
15 ms |
12004 KB |
Output is correct |
| 20 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 21 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 22 |
Correct |
16 ms |
12160 KB |
Output is correct |
| 23 |
Correct |
12 ms |
12160 KB |
Output is correct |
| 24 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 25 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 26 |
Correct |
15 ms |
12068 KB |
Output is correct |
| 27 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 28 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 30 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 31 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 34 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 35 |
Correct |
13 ms |
12100 KB |
Output is correct |
| 36 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 37 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 38 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 39 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 40 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 42 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 43 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 44 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12032 KB |
Output is correct |
| 46 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 47 |
Correct |
13 ms |
12160 KB |
Output is correct |
| 48 |
Correct |
15 ms |
12120 KB |
Output is correct |
| 49 |
Correct |
18 ms |
12160 KB |
Output is correct |
| 50 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 51 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 52 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 53 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 54 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 55 |
Correct |
14 ms |
12032 KB |
Output is correct |
| 56 |
Correct |
15 ms |
12160 KB |
Output is correct |
| 57 |
Correct |
15 ms |
12032 KB |
Output is correct |
| 58 |
Correct |
17 ms |
12160 KB |
Output is correct |
| 59 |
Correct |
661 ms |
30408 KB |
Output is correct |
| 60 |
Correct |
811 ms |
32364 KB |
Output is correct |
| 61 |
Correct |
13 ms |
12032 KB |
Output is correct |
| 62 |
Correct |
14 ms |
12160 KB |
Output is correct |
| 63 |
Correct |
584 ms |
28556 KB |
Output is correct |
| 64 |
Correct |
17 ms |
12432 KB |
Output is correct |
| 65 |
Correct |
31 ms |
13944 KB |
Output is correct |
| 66 |
Correct |
243 ms |
25976 KB |
Output is correct |
| 67 |
Correct |
686 ms |
40568 KB |
Output is correct |
| 68 |
Correct |
682 ms |
41416 KB |
Output is correct |
| 69 |
Correct |
34 ms |
12928 KB |
Output is correct |
| 70 |
Correct |
273 ms |
19492 KB |
Output is correct |
| 71 |
Correct |
844 ms |
35428 KB |
Output is correct |
| 72 |
Correct |
767 ms |
34680 KB |
Output is correct |
| 73 |
Correct |
212 ms |
17780 KB |
Output is correct |
| 74 |
Correct |
785 ms |
31256 KB |
Output is correct |
| 75 |
Correct |
87 ms |
14968 KB |
Output is correct |
| 76 |
Correct |
740 ms |
35056 KB |
Output is correct |
| 77 |
Correct |
690 ms |
35340 KB |
Output is correct |
| 78 |
Correct |
61 ms |
15096 KB |
Output is correct |
| 79 |
Correct |
661 ms |
38820 KB |
Output is correct |
| 80 |
Correct |
18 ms |
12316 KB |
Output is correct |
| 81 |
Correct |
215 ms |
19412 KB |
Output is correct |
| 82 |
Correct |
730 ms |
33576 KB |
Output is correct |
| 83 |
Correct |
735 ms |
31316 KB |
Output is correct |
| 84 |
Correct |
718 ms |
31244 KB |
Output is correct |
| 85 |
Correct |
740 ms |
31356 KB |
Output is correct |
| 86 |
Correct |
798 ms |
32388 KB |
Output is correct |
| 87 |
Correct |
820 ms |
32484 KB |
Output is correct |
