| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 821995 |
2023-08-12T00:43:38 Z |
vjudge1 |
Network (BOI15_net) |
C++17 |
|
754 ms |
41272 KB |
#include<bits/stdc++.h>
#define fi first
#define se second
using namespace std;
const int nmax = 500005;
vector<int>adj[nmax];
vector<int>leaf;
void DFS() {
stack<pair<int,int>>st;
st.push({1,0});
while(!st.empty()) {
int nod = st.top().fi;
int par = st.top().se;
st.pop();
if(adj[nod].size()==1) leaf.push_back(nod);
for(auto nxt:adj[nod]) {
if(nxt != par) st.push({nxt,nod});
}
}
}
int main() {
int n,a,b;
cin >> n;
for(int i=1; i<n; i++) {
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
DFS();
int N = (leaf.size()+1)/2;
cout << N << endl;
for(int i=0; i<N; i++) {
cout << leaf[i] << " " << leaf[i+(leaf.size()/2)] << endl;
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
11952 KB |
Output is correct |
| 5 |
Correct |
5 ms |
12000 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12008 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 16 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11940 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12028 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12104 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
11952 KB |
Output is correct |
| 5 |
Correct |
5 ms |
12000 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12008 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 16 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11940 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12028 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12104 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
9 ms |
12112 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12048 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12096 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12052 KB |
Output is correct |
| 29 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12104 KB |
Output is correct |
| 32 |
Correct |
6 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11996 KB |
Output is correct |
| 35 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 37 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 39 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 40 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 41 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12004 KB |
Output is correct |
| 43 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
6 ms |
12048 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12088 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12020 KB |
Output is correct |
| 48 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 49 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 50 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 56 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
10 ms |
12160 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
11952 KB |
Output is correct |
| 5 |
Correct |
5 ms |
12000 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
7 ms |
12008 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 12 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
12032 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 16 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11940 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
12028 KB |
Output is correct |
| 20 |
Correct |
7 ms |
12104 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
9 ms |
12112 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12048 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12096 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12052 KB |
Output is correct |
| 29 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 30 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12104 KB |
Output is correct |
| 32 |
Correct |
6 ms |
12032 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11996 KB |
Output is correct |
| 35 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 37 |
Correct |
5 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 39 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 40 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 41 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
8 ms |
12004 KB |
Output is correct |
| 43 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
6 ms |
12048 KB |
Output is correct |
| 46 |
Correct |
7 ms |
12088 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12020 KB |
Output is correct |
| 48 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 49 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 50 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
6 ms |
12044 KB |
Output is correct |
| 56 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
10 ms |
12160 KB |
Output is correct |
| 59 |
Correct |
602 ms |
31684 KB |
Output is correct |
| 60 |
Correct |
703 ms |
32464 KB |
Output is correct |
| 61 |
Correct |
6 ms |
11976 KB |
Output is correct |
| 62 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 63 |
Correct |
605 ms |
29376 KB |
Output is correct |
| 64 |
Correct |
9 ms |
12224 KB |
Output is correct |
| 65 |
Correct |
20 ms |
12740 KB |
Output is correct |
| 66 |
Correct |
188 ms |
17800 KB |
Output is correct |
| 67 |
Correct |
616 ms |
28052 KB |
Output is correct |
| 68 |
Correct |
624 ms |
28640 KB |
Output is correct |
| 69 |
Correct |
26 ms |
12868 KB |
Output is correct |
| 70 |
Correct |
221 ms |
20424 KB |
Output is correct |
| 71 |
Correct |
713 ms |
41272 KB |
Output is correct |
| 72 |
Correct |
688 ms |
38400 KB |
Output is correct |
| 73 |
Correct |
146 ms |
17484 KB |
Output is correct |
| 74 |
Correct |
697 ms |
31280 KB |
Output is correct |
| 75 |
Correct |
68 ms |
14972 KB |
Output is correct |
| 76 |
Correct |
679 ms |
38684 KB |
Output is correct |
| 77 |
Correct |
692 ms |
38908 KB |
Output is correct |
| 78 |
Correct |
56 ms |
13952 KB |
Output is correct |
| 79 |
Correct |
643 ms |
27868 KB |
Output is correct |
| 80 |
Correct |
15 ms |
12244 KB |
Output is correct |
| 81 |
Correct |
273 ms |
20420 KB |
Output is correct |
| 82 |
Correct |
754 ms |
36264 KB |
Output is correct |
| 83 |
Correct |
675 ms |
31504 KB |
Output is correct |
| 84 |
Correct |
683 ms |
31560 KB |
Output is correct |
| 85 |
Correct |
693 ms |
31532 KB |
Output is correct |
| 86 |
Correct |
743 ms |
32612 KB |
Output is correct |
| 87 |
Correct |
714 ms |
32588 KB |
Output is correct |
