# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
30476 |
2017-07-23T14:41:04 Z |
sampriti |
Network (BOI15_net) |
C++14 |
|
516 ms |
32100 KB |
#include <iostream>
#include <algorithm>
#include <vector>
#include <cassert>
using namespace std;
vector<int> G[500001];
vector<int> leaves;
void dfs(int i, int p) {
bool leaf = true;
for(int u: G[i]) {
if(u == p) continue;
leaf = false;
dfs(u, i);
}
if(leaf) leaves.push_back(i);
}
int main() {
ios::sync_with_stdio(false); cin.tie(0);
int N; cin >> N;
for(int i = 0; i < N - 1; i++) {
int a, b; cin >> a >> b;
G[a].push_back(b);
G[b].push_back(a);
}
dfs(1, 0);
if(G[1].size() == 1) leaves.push_back(1);
int ans = (leaves.size() + 1)/2;
cout << ans << endl;
for(int i = 0; i < ans; i++) {
assert((i + leaves.size()/2) < leaves.size());
cout << leaves[i] << " " << leaves[i + leaves.size()/2] << endl;
}
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
13896 KB |
Output is correct |
2 |
Correct |
0 ms |
13896 KB |
Output is correct |
3 |
Correct |
0 ms |
13896 KB |
Output is correct |
4 |
Correct |
3 ms |
13896 KB |
Output is correct |
5 |
Correct |
3 ms |
13896 KB |
Output is correct |
6 |
Correct |
3 ms |
13896 KB |
Output is correct |
7 |
Correct |
0 ms |
13896 KB |
Output is correct |
8 |
Correct |
3 ms |
13896 KB |
Output is correct |
9 |
Correct |
0 ms |
13896 KB |
Output is correct |
10 |
Correct |
3 ms |
13896 KB |
Output is correct |
11 |
Correct |
0 ms |
13896 KB |
Output is correct |
12 |
Correct |
0 ms |
13896 KB |
Output is correct |
13 |
Correct |
3 ms |
13896 KB |
Output is correct |
14 |
Correct |
6 ms |
13896 KB |
Output is correct |
15 |
Correct |
6 ms |
13896 KB |
Output is correct |
16 |
Correct |
6 ms |
13896 KB |
Output is correct |
17 |
Correct |
3 ms |
13896 KB |
Output is correct |
18 |
Correct |
3 ms |
13896 KB |
Output is correct |
19 |
Correct |
3 ms |
13896 KB |
Output is correct |
20 |
Correct |
0 ms |
13896 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
13896 KB |
Output is correct |
2 |
Correct |
0 ms |
13896 KB |
Output is correct |
3 |
Correct |
0 ms |
13896 KB |
Output is correct |
4 |
Correct |
3 ms |
13896 KB |
Output is correct |
5 |
Correct |
3 ms |
13896 KB |
Output is correct |
6 |
Correct |
3 ms |
13896 KB |
Output is correct |
7 |
Correct |
0 ms |
13896 KB |
Output is correct |
8 |
Correct |
3 ms |
13896 KB |
Output is correct |
9 |
Correct |
0 ms |
13896 KB |
Output is correct |
10 |
Correct |
3 ms |
13896 KB |
Output is correct |
11 |
Correct |
0 ms |
13896 KB |
Output is correct |
12 |
Correct |
0 ms |
13896 KB |
Output is correct |
13 |
Correct |
3 ms |
13896 KB |
Output is correct |
14 |
Correct |
6 ms |
13896 KB |
Output is correct |
15 |
Correct |
6 ms |
13896 KB |
Output is correct |
16 |
Correct |
6 ms |
13896 KB |
Output is correct |
17 |
Correct |
3 ms |
13896 KB |
Output is correct |
18 |
Correct |
3 ms |
13896 KB |
Output is correct |
19 |
Correct |
3 ms |
13896 KB |
Output is correct |
20 |
Correct |
0 ms |
13896 KB |
Output is correct |
21 |
Correct |
3 ms |
13896 KB |
Output is correct |
22 |
Correct |
6 ms |
13896 KB |
Output is correct |
23 |
Correct |
6 ms |
13896 KB |
Output is correct |
24 |
Correct |
0 ms |
13896 KB |
Output is correct |
25 |
Correct |
0 ms |
13896 KB |
Output is correct |
26 |
Correct |
0 ms |
13896 KB |
Output is correct |
27 |
Correct |
6 ms |
13896 KB |
Output is correct |
28 |
Correct |
13 ms |
13896 KB |
Output is correct |
29 |
Correct |
3 ms |
13896 KB |
Output is correct |
30 |
Correct |
3 ms |
13896 KB |
Output is correct |
31 |
Correct |
6 ms |
13896 KB |
Output is correct |
32 |
Correct |
3 ms |
13896 KB |
Output is correct |
33 |
Correct |
6 ms |
13896 KB |
Output is correct |
34 |
Correct |
0 ms |
13896 KB |
Output is correct |
35 |
Correct |
0 ms |
13896 KB |
Output is correct |
36 |
Correct |
0 ms |
13896 KB |
Output is correct |
37 |
Correct |
0 ms |
13896 KB |
Output is correct |
38 |
Correct |
0 ms |
13896 KB |
Output is correct |
39 |
Correct |
0 ms |
13896 KB |
Output is correct |
40 |
Correct |
0 ms |
13896 KB |
Output is correct |
41 |
Correct |
3 ms |
13896 KB |
Output is correct |
42 |
Correct |
0 ms |
13896 KB |
Output is correct |
43 |
Correct |
6 ms |
13896 KB |
Output is correct |
44 |
Correct |
0 ms |
13896 KB |
Output is correct |
45 |
Correct |
0 ms |
13896 KB |
Output is correct |
46 |
Correct |
0 ms |
13896 KB |
Output is correct |
47 |
Correct |
3 ms |
13896 KB |
Output is correct |
48 |
Correct |
3 ms |
13896 KB |
Output is correct |
49 |
Correct |
3 ms |
13896 KB |
Output is correct |
50 |
Correct |
0 ms |
13896 KB |
Output is correct |
51 |
Correct |
0 ms |
13896 KB |
Output is correct |
52 |
Correct |
0 ms |
13896 KB |
Output is correct |
53 |
Correct |
0 ms |
13896 KB |
Output is correct |
54 |
Correct |
0 ms |
13896 KB |
Output is correct |
55 |
Correct |
0 ms |
13896 KB |
Output is correct |
56 |
Correct |
3 ms |
13896 KB |
Output is correct |
57 |
Correct |
0 ms |
13896 KB |
Output is correct |
58 |
Correct |
3 ms |
13896 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
13896 KB |
Output is correct |
2 |
Correct |
0 ms |
13896 KB |
Output is correct |
3 |
Correct |
0 ms |
13896 KB |
Output is correct |
4 |
Correct |
3 ms |
13896 KB |
Output is correct |
5 |
Correct |
3 ms |
13896 KB |
Output is correct |
6 |
Correct |
3 ms |
13896 KB |
Output is correct |
7 |
Correct |
0 ms |
13896 KB |
Output is correct |
8 |
Correct |
3 ms |
13896 KB |
Output is correct |
9 |
Correct |
0 ms |
13896 KB |
Output is correct |
10 |
Correct |
3 ms |
13896 KB |
Output is correct |
11 |
Correct |
0 ms |
13896 KB |
Output is correct |
12 |
Correct |
0 ms |
13896 KB |
Output is correct |
13 |
Correct |
3 ms |
13896 KB |
Output is correct |
14 |
Correct |
6 ms |
13896 KB |
Output is correct |
15 |
Correct |
6 ms |
13896 KB |
Output is correct |
16 |
Correct |
6 ms |
13896 KB |
Output is correct |
17 |
Correct |
3 ms |
13896 KB |
Output is correct |
18 |
Correct |
3 ms |
13896 KB |
Output is correct |
19 |
Correct |
3 ms |
13896 KB |
Output is correct |
20 |
Correct |
0 ms |
13896 KB |
Output is correct |
21 |
Correct |
3 ms |
13896 KB |
Output is correct |
22 |
Correct |
6 ms |
13896 KB |
Output is correct |
23 |
Correct |
6 ms |
13896 KB |
Output is correct |
24 |
Correct |
0 ms |
13896 KB |
Output is correct |
25 |
Correct |
0 ms |
13896 KB |
Output is correct |
26 |
Correct |
0 ms |
13896 KB |
Output is correct |
27 |
Correct |
6 ms |
13896 KB |
Output is correct |
28 |
Correct |
13 ms |
13896 KB |
Output is correct |
29 |
Correct |
3 ms |
13896 KB |
Output is correct |
30 |
Correct |
3 ms |
13896 KB |
Output is correct |
31 |
Correct |
6 ms |
13896 KB |
Output is correct |
32 |
Correct |
3 ms |
13896 KB |
Output is correct |
33 |
Correct |
6 ms |
13896 KB |
Output is correct |
34 |
Correct |
0 ms |
13896 KB |
Output is correct |
35 |
Correct |
0 ms |
13896 KB |
Output is correct |
36 |
Correct |
0 ms |
13896 KB |
Output is correct |
37 |
Correct |
0 ms |
13896 KB |
Output is correct |
38 |
Correct |
0 ms |
13896 KB |
Output is correct |
39 |
Correct |
0 ms |
13896 KB |
Output is correct |
40 |
Correct |
0 ms |
13896 KB |
Output is correct |
41 |
Correct |
3 ms |
13896 KB |
Output is correct |
42 |
Correct |
0 ms |
13896 KB |
Output is correct |
43 |
Correct |
6 ms |
13896 KB |
Output is correct |
44 |
Correct |
0 ms |
13896 KB |
Output is correct |
45 |
Correct |
0 ms |
13896 KB |
Output is correct |
46 |
Correct |
0 ms |
13896 KB |
Output is correct |
47 |
Correct |
3 ms |
13896 KB |
Output is correct |
48 |
Correct |
3 ms |
13896 KB |
Output is correct |
49 |
Correct |
3 ms |
13896 KB |
Output is correct |
50 |
Correct |
0 ms |
13896 KB |
Output is correct |
51 |
Correct |
0 ms |
13896 KB |
Output is correct |
52 |
Correct |
0 ms |
13896 KB |
Output is correct |
53 |
Correct |
0 ms |
13896 KB |
Output is correct |
54 |
Correct |
0 ms |
13896 KB |
Output is correct |
55 |
Correct |
0 ms |
13896 KB |
Output is correct |
56 |
Correct |
3 ms |
13896 KB |
Output is correct |
57 |
Correct |
0 ms |
13896 KB |
Output is correct |
58 |
Correct |
3 ms |
13896 KB |
Output is correct |
59 |
Runtime error |
516 ms |
32100 KB |
Execution timed out (wall clock limit exceeded) |
60 |
Halted |
0 ms |
0 KB |
- |