| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 952578 |
2024-03-24T09:58:41 Z |
PM1 |
Network (BOI15_net) |
C++17 |
|
363 ms |
49616 KB |
#include <bits/stdc++.h>
using namespace std;
const int mxn=5e5+5;
int n,k,root,par[mxn];
vector<int>v[mxn],leaf;
void dfs(int z){
bool cnt=0;
for(auto i:v[z]){
if(par[z]!=i){
cnt=1;
par[i]=z;
dfs(i);
}
}
if(!cnt)
leaf.push_back(z);
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin>>n;
for(int i=1;i<n;i++){
int x,y;
cin>>x>>y;
v[x].push_back(y);
v[y].push_back(x);
}
for(int i=1;i<=n;i++){
if(v[i].size()>1){
root=i;
break;
}
}
dfs(root);
k=(leaf.size()+1)/2;
cout<<k<<'\n';
for(int i=1;i<=k;i++){
cout<<leaf[i-1]<<" "<<leaf[min((int)leaf.size()-1,i+k-1)]<<'\n';
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 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 |
12888 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13144 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 |
12892 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12888 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 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 |
12888 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13144 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 |
12892 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12948 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12984 KB |
Output is correct |
| 23 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
4 ms |
13220 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12892 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 |
2 ms |
12892 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 46 |
Correct |
4 ms |
12956 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 54 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12892 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 |
12892 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 4 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12892 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 |
12888 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 11 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 12 |
Correct |
3 ms |
13144 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 |
12892 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12948 KB |
Output is correct |
| 22 |
Correct |
4 ms |
12984 KB |
Output is correct |
| 23 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 27 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 31 |
Correct |
4 ms |
13220 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 33 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12892 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 |
2 ms |
12892 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 46 |
Correct |
4 ms |
12956 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12888 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12900 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12904 KB |
Output is correct |
| 50 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12956 KB |
Output is correct |
| 52 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 54 |
Correct |
3 ms |
13144 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 58 |
Correct |
4 ms |
12892 KB |
Output is correct |
| 59 |
Correct |
201 ms |
37740 KB |
Output is correct |
| 60 |
Correct |
273 ms |
40648 KB |
Output is correct |
| 61 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12892 KB |
Output is correct |
| 63 |
Correct |
191 ms |
35160 KB |
Output is correct |
| 64 |
Correct |
4 ms |
13148 KB |
Output is correct |
| 65 |
Correct |
10 ms |
14836 KB |
Output is correct |
| 66 |
Correct |
80 ms |
28760 KB |
Output is correct |
| 67 |
Correct |
363 ms |
48956 KB |
Output is correct |
| 68 |
Correct |
340 ms |
49616 KB |
Output is correct |
| 69 |
Correct |
7 ms |
13688 KB |
Output is correct |
| 70 |
Correct |
46 ms |
22088 KB |
Output is correct |
| 71 |
Correct |
218 ms |
43840 KB |
Output is correct |
| 72 |
Correct |
188 ms |
42560 KB |
Output is correct |
| 73 |
Correct |
54 ms |
19924 KB |
Output is correct |
| 74 |
Correct |
280 ms |
39636 KB |
Output is correct |
| 75 |
Correct |
17 ms |
16088 KB |
Output is correct |
| 76 |
Correct |
168 ms |
43576 KB |
Output is correct |
| 77 |
Correct |
189 ms |
43640 KB |
Output is correct |
| 78 |
Correct |
17 ms |
16216 KB |
Output is correct |
| 79 |
Correct |
334 ms |
47184 KB |
Output is correct |
| 80 |
Correct |
5 ms |
13144 KB |
Output is correct |
| 81 |
Correct |
58 ms |
21960 KB |
Output is correct |
| 82 |
Correct |
223 ms |
41408 KB |
Output is correct |
| 83 |
Correct |
298 ms |
39608 KB |
Output is correct |
| 84 |
Correct |
278 ms |
39756 KB |
Output is correct |
| 85 |
Correct |
272 ms |
39620 KB |
Output is correct |
| 86 |
Correct |
269 ms |
40648 KB |
Output is correct |
| 87 |
Correct |
263 ms |
40836 KB |
Output is correct |
