| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 911158 |
2024-01-18T13:47:08 Z |
ttamx |
Network (BOI15_net) |
C++14 |
|
653 ms |
47280 KB |
#include<bits/stdc++.h>
using namespace std;
const int N=5e5+5;
int n;
int sz[N];
vector<int> adj[N],comp;
int dfssz(int u,int p=0){
sz[u]=(adj[u].size()<2);
for(auto v:adj[u])if(v!=p)sz[u]+=dfssz(v,u);
return sz[u];
}
int centroid(int u,int cnt,int p=0){
for(auto v:adj[u])if(v!=p&&sz[v]>cnt/2)return centroid(v,cnt,u);
return u;
}
void dfs(int u,int p=0){
if(adj[u].size()==1)comp.emplace_back(u);
for(auto v:adj[u])if(v!=p)dfs(v,u);
}
int main(){
cin.tie(nullptr)->sync_with_stdio(false);
cin >> n;
for(int i=1;i<n;i++){
int u,v;
cin >> u >> v;
adj[u].emplace_back(v);
adj[v].emplace_back(u);
}
int c=centroid(1,dfssz(1));
dfs(c);
comp.emplace_back(c);
int ans=comp.size()/2;
cout << ans << "\n";
for(int i=0;i<ans;i++)cout << comp[i] << " " << comp[i+ans] << "\n";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12900 KB |
Output is correct |
| 8 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
4 ms |
13060 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 16 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
4 ms |
12896 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12900 KB |
Output is correct |
| 8 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
4 ms |
13060 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 16 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
4 ms |
12896 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 23 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 24 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 25 |
Correct |
5 ms |
13032 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
5 ms |
12920 KB |
Output is correct |
| 28 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 29 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 30 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12908 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12916 KB |
Output is correct |
| 33 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
4 ms |
12908 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12944 KB |
Output is correct |
| 36 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 37 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 38 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 42 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12896 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12896 KB |
Output is correct |
| 45 |
Correct |
4 ms |
12900 KB |
Output is correct |
| 46 |
Correct |
6 ms |
12908 KB |
Output is correct |
| 47 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 49 |
Correct |
6 ms |
12896 KB |
Output is correct |
| 50 |
Correct |
4 ms |
12896 KB |
Output is correct |
| 51 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 54 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 56 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 57 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12900 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 3 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 7 |
Correct |
5 ms |
12900 KB |
Output is correct |
| 8 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 9 |
Correct |
4 ms |
13060 KB |
Output is correct |
| 10 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 13 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 14 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 15 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 16 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 17 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
4 ms |
12896 KB |
Output is correct |
| 19 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 23 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 24 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 25 |
Correct |
5 ms |
13032 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
5 ms |
12920 KB |
Output is correct |
| 28 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 29 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 30 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12908 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12916 KB |
Output is correct |
| 33 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
4 ms |
12908 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12944 KB |
Output is correct |
| 36 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 37 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 38 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 40 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 42 |
Correct |
5 ms |
12892 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12896 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12896 KB |
Output is correct |
| 45 |
Correct |
4 ms |
12900 KB |
Output is correct |
| 46 |
Correct |
6 ms |
12908 KB |
Output is correct |
| 47 |
Correct |
4 ms |
12888 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 49 |
Correct |
6 ms |
12896 KB |
Output is correct |
| 50 |
Correct |
4 ms |
12896 KB |
Output is correct |
| 51 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 54 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 56 |
Correct |
4 ms |
12904 KB |
Output is correct |
| 57 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12900 KB |
Output is correct |
| 59 |
Correct |
404 ms |
31816 KB |
Output is correct |
| 60 |
Correct |
511 ms |
34224 KB |
Output is correct |
| 61 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 63 |
Correct |
369 ms |
29840 KB |
Output is correct |
| 64 |
Correct |
6 ms |
13404 KB |
Output is correct |
| 65 |
Correct |
17 ms |
14684 KB |
Output is correct |
| 66 |
Correct |
184 ms |
29124 KB |
Output is correct |
| 67 |
Correct |
650 ms |
46572 KB |
Output is correct |
| 68 |
Correct |
626 ms |
47280 KB |
Output is correct |
| 69 |
Correct |
10 ms |
13660 KB |
Output is correct |
| 70 |
Correct |
63 ms |
20016 KB |
Output is correct |
| 71 |
Correct |
210 ms |
37184 KB |
Output is correct |
| 72 |
Correct |
260 ms |
36348 KB |
Output is correct |
| 73 |
Correct |
59 ms |
18132 KB |
Output is correct |
| 74 |
Correct |
504 ms |
33152 KB |
Output is correct |
| 75 |
Correct |
20 ms |
15320 KB |
Output is correct |
| 76 |
Correct |
320 ms |
36776 KB |
Output is correct |
| 77 |
Correct |
245 ms |
37176 KB |
Output is correct |
| 78 |
Correct |
20 ms |
15708 KB |
Output is correct |
| 79 |
Correct |
653 ms |
44236 KB |
Output is correct |
| 80 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 81 |
Correct |
63 ms |
19960 KB |
Output is correct |
| 82 |
Correct |
357 ms |
35120 KB |
Output is correct |
| 83 |
Correct |
462 ms |
33124 KB |
Output is correct |
| 84 |
Correct |
394 ms |
33104 KB |
Output is correct |
| 85 |
Correct |
435 ms |
32968 KB |
Output is correct |
| 86 |
Correct |
384 ms |
34248 KB |
Output is correct |
| 87 |
Correct |
355 ms |
34240 KB |
Output is correct |
