| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 637470 |
2022-09-02T02:01:44 Z |
bonk |
Network (BOI15_net) |
C++14 |
|
1 ms |
328 KB |
#include <bits/stdc++.h>
using namespace std;
const int N = 5e5;
int d[N + 2];
int main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n; cin >> n;
for(int i = 0; i < n - 1; i++){
int u, v; cin >> u >> v;
d[u]++;
d[v]++;
}
vector<int>leaf;
for(int i = 1; i <= n; i++){
if(d[i] == 1) leaf.push_back(i);
}
int sz = leaf.size();
cout << (sz + 1)/2 << '\n';
if(sz&1) cout << leaf[0] << " " << leaf.back() << '\n';
for(int i = 0; i < sz - 1; i += 2) cout << leaf[i] << " " << leaf[i + 1] << '\n';
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
328 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
324 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
212 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
328 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
324 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
212 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
328 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
324 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
324 KB |
Output is correct |
| 10 |
Incorrect |
1 ms |
212 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
