| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 978022 |
2024-05-08T16:41:25 Z |
AlphaMale06 |
Network (BOI15_net) |
C++17 |
|
374 ms |
59632 KB |
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
const int N = 5e5+3;
int deg[N];
vector<int> g[N];
vector<int> ls;
void dfs(int v, int p){
if(g[v].size()==1)ls.pb(v);
for(int to : g[v]){
if(to!=p)dfs(to, v);
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
for(int i=1; i<n; i++){
int a, b;
cin >> a >> b;
g[a].pb(b);
g[b].pb(a);
deg[a]++;
deg[b]++;
}
int root=1;
for(int i=2; i<=n; i++){
if(deg[i]>1)root=i;
}
dfs(root, root);
int cnt=ls.size();
cout << (cnt+1)/2 << '\n';
for(int i=0; i<cnt/2; i++){
cout << ls[i] << " " << ls[i+cnt/2] << '\n';
}
if(cnt&1)cout << ls[0] << " " << ls.back() << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12908 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13140 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12960 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12908 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13140 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12960 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 23 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 26 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
3 ms |
12968 KB |
Output is correct |
| 28 |
Correct |
4 ms |
13004 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 32 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
3 ms |
13088 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 39 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 49 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 54 |
Correct |
2 ms |
12892 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12892 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12908 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 16 |
Correct |
3 ms |
13140 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12960 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 23 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 26 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
3 ms |
12968 KB |
Output is correct |
| 28 |
Correct |
4 ms |
13004 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 32 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
3 ms |
13088 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 39 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 49 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 54 |
Correct |
2 ms |
12892 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 59 |
Correct |
228 ms |
37764 KB |
Output is correct |
| 60 |
Correct |
320 ms |
40844 KB |
Output is correct |
| 61 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 63 |
Correct |
207 ms |
35144 KB |
Output is correct |
| 64 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 65 |
Correct |
9 ms |
14680 KB |
Output is correct |
| 66 |
Correct |
62 ms |
26008 KB |
Output is correct |
| 67 |
Correct |
313 ms |
59632 KB |
Output is correct |
| 68 |
Correct |
311 ms |
52696 KB |
Output is correct |
| 69 |
Correct |
6 ms |
13660 KB |
Output is correct |
| 70 |
Correct |
50 ms |
22056 KB |
Output is correct |
| 71 |
Correct |
187 ms |
43836 KB |
Output is correct |
| 72 |
Correct |
202 ms |
42644 KB |
Output is correct |
| 73 |
Correct |
46 ms |
19924 KB |
Output is correct |
| 74 |
Correct |
278 ms |
39572 KB |
Output is correct |
| 75 |
Correct |
22 ms |
16336 KB |
Output is correct |
| 76 |
Correct |
183 ms |
43568 KB |
Output is correct |
| 77 |
Correct |
207 ms |
43704 KB |
Output is correct |
| 78 |
Correct |
17 ms |
16220 KB |
Output is correct |
| 79 |
Correct |
374 ms |
46960 KB |
Output is correct |
| 80 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 81 |
Correct |
63 ms |
22348 KB |
Output is correct |
| 82 |
Correct |
312 ms |
41420 KB |
Output is correct |
| 83 |
Correct |
294 ms |
39692 KB |
Output is correct |
| 84 |
Correct |
292 ms |
39616 KB |
Output is correct |
| 85 |
Correct |
300 ms |
39784 KB |
Output is correct |
| 86 |
Correct |
332 ms |
40724 KB |
Output is correct |
| 87 |
Correct |
300 ms |
40716 KB |
Output is correct |
