| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 614159 |
2022-07-30T20:27:03 Z |
sword060 |
Network (BOI15_net) |
C++17 |
|
596 ms |
69416 KB |
#include <bits/stdc++.h>
using namespace std;
int x;
vector<int>v[500005];
vector<pair<int,int>>ans;
vector<int> dfs(int i,int p=-1){
vector<int>ret;
if(v[i].size()==1)ret.push_back(i);
for(auto j:v[i]){
if(j==p)continue;
vector<int>lol=dfs(j,i);
if(lol.size()>ret.size())swap(lol,ret);
while(ret.size()&&ret.size()+lol.size()>2){
int c1=ret.back(),c2=lol.back();
ret.pop_back();lol.pop_back();
ans.push_back({c1,c2});
}
for(auto k:lol)ret.push_back(k);
}
if(p==-1){
for(int j=0;j<ret.size()/2;j++)
ans.push_back({ret[j],ret[ret.size()-j-1]});
if((int)ret.size()%2)ans.push_back({ret[ret.size()/2],i});
}
return ret;
}
int main(){
ios::sync_with_stdio(0); cin.tie(0);
cin>>x;
for(int i=1;i<=x-1;i++){
int l,r;cin>>l>>r;
v[l].push_back(r);
v[r].push_back(l);
}
for(int i=1;i<=x;i++)if(v[i].size()>1){dfs(1);break;}
cout<<ans.size()<<"\n";
for(auto [l,r]:ans)cout<<l<<" "<<r<<endl;
return 0;
}
Compilation message
net.cpp: In function 'std::vector<int> dfs(int, int)':
net.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
21 | for(int j=0;j<ret.size()/2;j++)
| ~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11968 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12008 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11988 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11968 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12008 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12072 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12156 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12076 KB |
Output is correct |
| 25 |
Correct |
9 ms |
12080 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12080 KB |
Output is correct |
| 30 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12144 KB |
Output is correct |
| 32 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 35 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 41 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12044 KB |
Output is correct |
| 46 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 48 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11984 KB |
Output is correct |
| 51 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
9 ms |
12072 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 55 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12116 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
6 ms |
12024 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
7 ms |
11968 KB |
Output is correct |
| 10 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12008 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 15 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12072 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12156 KB |
Output is correct |
| 24 |
Correct |
8 ms |
12076 KB |
Output is correct |
| 25 |
Correct |
9 ms |
12080 KB |
Output is correct |
| 26 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 28 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12080 KB |
Output is correct |
| 30 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12144 KB |
Output is correct |
| 32 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 35 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 36 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 37 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12084 KB |
Output is correct |
| 39 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 40 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 41 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12044 KB |
Output is correct |
| 46 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 47 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 48 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11984 KB |
Output is correct |
| 51 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
9 ms |
12072 KB |
Output is correct |
| 54 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 55 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 58 |
Correct |
8 ms |
12116 KB |
Output is correct |
| 59 |
Correct |
541 ms |
36016 KB |
Output is correct |
| 60 |
Correct |
591 ms |
38756 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 62 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 63 |
Correct |
458 ms |
33492 KB |
Output is correct |
| 64 |
Correct |
9 ms |
12884 KB |
Output is correct |
| 65 |
Correct |
16 ms |
15276 KB |
Output is correct |
| 66 |
Correct |
117 ms |
41148 KB |
Output is correct |
| 67 |
Correct |
429 ms |
67840 KB |
Output is correct |
| 68 |
Correct |
462 ms |
69416 KB |
Output is correct |
| 69 |
Correct |
20 ms |
12884 KB |
Output is correct |
| 70 |
Correct |
203 ms |
21316 KB |
Output is correct |
| 71 |
Correct |
566 ms |
41984 KB |
Output is correct |
| 72 |
Correct |
561 ms |
40772 KB |
Output is correct |
| 73 |
Correct |
115 ms |
19088 KB |
Output is correct |
| 74 |
Correct |
589 ms |
37760 KB |
Output is correct |
| 75 |
Correct |
60 ms |
15196 KB |
Output is correct |
| 76 |
Correct |
593 ms |
41520 KB |
Output is correct |
| 77 |
Correct |
572 ms |
41764 KB |
Output is correct |
| 78 |
Correct |
34 ms |
16632 KB |
Output is correct |
| 79 |
Correct |
433 ms |
63232 KB |
Output is correct |
| 80 |
Correct |
11 ms |
12244 KB |
Output is correct |
| 81 |
Correct |
155 ms |
21416 KB |
Output is correct |
| 82 |
Correct |
562 ms |
39496 KB |
Output is correct |
| 83 |
Correct |
541 ms |
37880 KB |
Output is correct |
| 84 |
Correct |
547 ms |
37736 KB |
Output is correct |
| 85 |
Correct |
574 ms |
37680 KB |
Output is correct |
| 86 |
Correct |
596 ms |
38868 KB |
Output is correct |
| 87 |
Correct |
577 ms |
38804 KB |
Output is correct |
