# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
876012 | 2023-11-21T05:21:55 Z | vjudge1 | Network (BOI15_net) | C++17 | 4 ms | 5212 KB |
#include <bits/stdc++.h> using namespace std; bool seen[100005]={false}; vector<int> links[100005]; vector<int> roots; int last=-1; void dfs(int at){ if(seen[at]){ return; } seen[at]=true; if(links[at].size()==1){ roots.push_back(at); } for(int to:links[at]){ if(!seen[to]) dfs(to); } } int main(){ int n; cin>>n; for(int i=0; i<n-1; i++){ int a,b; cin>>a>>b; links[a].push_back(b); links[b].push_back(a); } dfs(1); int total=roots.size()/2; vector<pair<int,int>> ans; for(int i=0; i<total; i++){ ans.push_back({roots[i],roots[i+total]}); } if(roots.size()%2==1){ ans.push_back({roots[0],roots[roots.size()-1]}); total++; } cout<<total<<endl; for(int i=0; i<ans.size(); i++){ cout<<ans[i].first<<' '<<ans[i].second<<endl; } }
Compilation message
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 1 ms | 2652 KB | Output is correct |
2 | Correct | 1 ms | 2652 KB | Output is correct |
3 | Correct | 1 ms | 2652 KB | Output is correct |
4 | Correct | 1 ms | 2652 KB | Output is correct |
5 | Correct | 1 ms | 2652 KB | Output is correct |
6 | Correct | 1 ms | 2652 KB | Output is correct |
7 | Correct | 1 ms | 2652 KB | Output is correct |
8 | Correct | 1 ms | 2652 KB | Output is correct |
9 | Correct | 1 ms | 2652 KB | Output is correct |
10 | Correct | 1 ms | 2652 KB | Output is correct |
11 | Correct | 1 ms | 2652 KB | Output is correct |
12 | Correct | 1 ms | 2652 KB | Output is correct |
13 | Correct | 1 ms | 2652 KB | Output is correct |
14 | Correct | 1 ms | 2652 KB | Output is correct |
15 | Correct | 1 ms | 2652 KB | Output is correct |
16 | Correct | 1 ms | 2652 KB | Output is correct |
17 | Correct | 1 ms | 2652 KB | Output is correct |
18 | Correct | 1 ms | 2652 KB | Output is correct |
19 | Correct | 1 ms | 2652 KB | Output is correct |
20 | Correct | 1 ms | 2652 KB | Output is correct |
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 1 ms | 2652 KB | Output is correct |
2 | Correct | 1 ms | 2652 KB | Output is correct |
3 | Correct | 1 ms | 2652 KB | Output is correct |
4 | Correct | 1 ms | 2652 KB | Output is correct |
5 | Correct | 1 ms | 2652 KB | Output is correct |
6 | Correct | 1 ms | 2652 KB | Output is correct |
7 | Correct | 1 ms | 2652 KB | Output is correct |
8 | Correct | 1 ms | 2652 KB | Output is correct |
9 | Correct | 1 ms | 2652 KB | Output is correct |
10 | Correct | 1 ms | 2652 KB | Output is correct |
11 | Correct | 1 ms | 2652 KB | Output is correct |
12 | Correct | 1 ms | 2652 KB | Output is correct |
13 | Correct | 1 ms | 2652 KB | Output is correct |
14 | Correct | 1 ms | 2652 KB | Output is correct |
15 | Correct | 1 ms | 2652 KB | Output is correct |
16 | Correct | 1 ms | 2652 KB | Output is correct |
17 | Correct | 1 ms | 2652 KB | Output is correct |
18 | Correct | 1 ms | 2652 KB | Output is correct |
19 | Correct | 1 ms | 2652 KB | Output is correct |
20 | Correct | 1 ms | 2652 KB | Output is correct |
21 | Correct | 1 ms | 2652 KB | Output is correct |
22 | Correct | 3 ms | 2652 KB | Output is correct |
23 | Correct | 4 ms | 2908 KB | Output is correct |
24 | Correct | 3 ms | 2652 KB | Output is correct |
25 | Correct | 2 ms | 2652 KB | Output is correct |
26 | Correct | 2 ms | 2652 KB | Output is correct |
27 | Correct | 2 ms | 2652 KB | Output is correct |
28 | Correct | 2 ms | 2652 KB | Output is correct |
29 | Correct | 2 ms | 2652 KB | Output is correct |
30 | Correct | 1 ms | 2648 KB | Output is correct |
31 | Correct | 2 ms | 2652 KB | Output is correct |
32 | Correct | 1 ms | 2648 KB | Output is correct |
33 | Correct | 1 ms | 2652 KB | Output is correct |
34 | Correct | 1 ms | 2652 KB | Output is correct |
35 | Correct | 1 ms | 2652 KB | Output is correct |
36 | Correct | 1 ms | 2648 KB | Output is correct |
37 | Correct | 1 ms | 2652 KB | Output is correct |
38 | Correct | 1 ms | 2652 KB | Output is correct |
39 | Correct | 1 ms | 2652 KB | Output is correct |
40 | Correct | 1 ms | 2652 KB | Output is correct |
41 | Correct | 1 ms | 2652 KB | Output is correct |
42 | Correct | 2 ms | 2652 KB | Output is correct |
43 | Correct | 2 ms | 2648 KB | Output is correct |
44 | Correct | 1 ms | 2848 KB | Output is correct |
45 | Correct | 1 ms | 2652 KB | Output is correct |
46 | Correct | 1 ms | 2648 KB | Output is correct |
47 | Correct | 1 ms | 2648 KB | Output is correct |
48 | Correct | 1 ms | 2648 KB | Output is correct |
49 | Correct | 2 ms | 2652 KB | Output is correct |
50 | Correct | 1 ms | 2648 KB | Output is correct |
51 | Correct | 1 ms | 2652 KB | Output is correct |
52 | Correct | 1 ms | 2652 KB | Output is correct |
53 | Correct | 1 ms | 2652 KB | Output is correct |
54 | Correct | 1 ms | 2652 KB | Output is correct |
55 | Correct | 1 ms | 2648 KB | Output is correct |
56 | Correct | 1 ms | 2668 KB | Output is correct |
57 | Correct | 1 ms | 2660 KB | Output is correct |
58 | Correct | 3 ms | 2904 KB | Output is correct |
# | 결과 | 실행 시간 | 메모리 | Grader output |
---|---|---|---|---|
1 | Correct | 1 ms | 2652 KB | Output is correct |
2 | Correct | 1 ms | 2652 KB | Output is correct |
3 | Correct | 1 ms | 2652 KB | Output is correct |
4 | Correct | 1 ms | 2652 KB | Output is correct |
5 | Correct | 1 ms | 2652 KB | Output is correct |
6 | Correct | 1 ms | 2652 KB | Output is correct |
7 | Correct | 1 ms | 2652 KB | Output is correct |
8 | Correct | 1 ms | 2652 KB | Output is correct |
9 | Correct | 1 ms | 2652 KB | Output is correct |
10 | Correct | 1 ms | 2652 KB | Output is correct |
11 | Correct | 1 ms | 2652 KB | Output is correct |
12 | Correct | 1 ms | 2652 KB | Output is correct |
13 | Correct | 1 ms | 2652 KB | Output is correct |
14 | Correct | 1 ms | 2652 KB | Output is correct |
15 | Correct | 1 ms | 2652 KB | Output is correct |
16 | Correct | 1 ms | 2652 KB | Output is correct |
17 | Correct | 1 ms | 2652 KB | Output is correct |
18 | Correct | 1 ms | 2652 KB | Output is correct |
19 | Correct | 1 ms | 2652 KB | Output is correct |
20 | Correct | 1 ms | 2652 KB | Output is correct |
21 | Correct | 1 ms | 2652 KB | Output is correct |
22 | Correct | 3 ms | 2652 KB | Output is correct |
23 | Correct | 4 ms | 2908 KB | Output is correct |
24 | Correct | 3 ms | 2652 KB | Output is correct |
25 | Correct | 2 ms | 2652 KB | Output is correct |
26 | Correct | 2 ms | 2652 KB | Output is correct |
27 | Correct | 2 ms | 2652 KB | Output is correct |
28 | Correct | 2 ms | 2652 KB | Output is correct |
29 | Correct | 2 ms | 2652 KB | Output is correct |
30 | Correct | 1 ms | 2648 KB | Output is correct |
31 | Correct | 2 ms | 2652 KB | Output is correct |
32 | Correct | 1 ms | 2648 KB | Output is correct |
33 | Correct | 1 ms | 2652 KB | Output is correct |
34 | Correct | 1 ms | 2652 KB | Output is correct |
35 | Correct | 1 ms | 2652 KB | Output is correct |
36 | Correct | 1 ms | 2648 KB | Output is correct |
37 | Correct | 1 ms | 2652 KB | Output is correct |
38 | Correct | 1 ms | 2652 KB | Output is correct |
39 | Correct | 1 ms | 2652 KB | Output is correct |
40 | Correct | 1 ms | 2652 KB | Output is correct |
41 | Correct | 1 ms | 2652 KB | Output is correct |
42 | Correct | 2 ms | 2652 KB | Output is correct |
43 | Correct | 2 ms | 2648 KB | Output is correct |
44 | Correct | 1 ms | 2848 KB | Output is correct |
45 | Correct | 1 ms | 2652 KB | Output is correct |
46 | Correct | 1 ms | 2648 KB | Output is correct |
47 | Correct | 1 ms | 2648 KB | Output is correct |
48 | Correct | 1 ms | 2648 KB | Output is correct |
49 | Correct | 2 ms | 2652 KB | Output is correct |
50 | Correct | 1 ms | 2648 KB | Output is correct |
51 | Correct | 1 ms | 2652 KB | Output is correct |
52 | Correct | 1 ms | 2652 KB | Output is correct |
53 | Correct | 1 ms | 2652 KB | Output is correct |
54 | Correct | 1 ms | 2652 KB | Output is correct |
55 | Correct | 1 ms | 2648 KB | Output is correct |
56 | Correct | 1 ms | 2668 KB | Output is correct |
57 | Correct | 1 ms | 2660 KB | Output is correct |
58 | Correct | 3 ms | 2904 KB | Output is correct |
59 | Runtime error | 2 ms | 5212 KB | Execution killed with signal 11 |
60 | Halted | 0 ms | 0 KB | - |