| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 849585 |
2023-09-15T03:47:16 Z |
dungz |
Network (BOI15_net) |
C++17 |
|
358 ms |
47824 KB |
//#pragma GCC optimize ("O2")
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define endl '\n'
#define task "task"
#define task "task"
#define prll pair<ll,ll>
#define pb push_back
#define ld long double
const ll MIN=-1e18,MAX=1e18,MOD=1e9+7;
vector<int> a[500005];
vector<int> leaves;
void dfs(int u,int par)
{
if(a[u].size()==1) leaves.push_back(u);
for(auto i:a[u])
{
if(i!=par)
{
dfs(i,u);
}
}
}
int main(){
//freopen (task".inp", "r", stdin);
//freopen (task".out", "w", stdout);
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n;
cin>>n;
leaves.push_back(0);
for(int i=1;i<n;i++)
{
int x,y;
cin>>x>>y;
a[x].push_back(y);
a[y].push_back(x);
}
dfs(1,0);
// for(auto i:leaves) cout<<i<<" ";
// cout<<endl;
if(leaves.size()%2==1)
{
cout<<leaves.size()/2<<endl;
for(int i=1;i<=leaves.size()/2;i++)
{
cout<<leaves[i]<<" "<<leaves[i+leaves.size()/2]<<endl;
}
// if(leaves.size()%2==01)cout<<leaves[leaves.size()/2]<<" "<<1<<endl;
}
else
{
cout<<leaves.size()/2<<endl;
for(int i=1;i<=leaves.size()/2-1;i++)
{
cout<<leaves[i]<<" "<<leaves[i+leaves.size()/2]<<endl;
}
cout<<leaves[leaves.size()/2]<<" "<<1<<endl;
}
}
/*
*/
Compilation message
net.cpp: In function 'int main()':
net.cpp:47:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
47 | for(int i=1;i<=leaves.size()/2;i++)
| ~^~~~~~~~~~~~~~~~~
net.cpp:56:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
56 | for(int i=1;i<=leaves.size()/2-1;i++)
| ~^~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12276 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12276 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12216 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
4 ms |
12284 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12380 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12376 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12140 KB |
Output is correct |
| 50 |
Correct |
4 ms |
12200 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12380 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 54 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12216 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 58 |
Correct |
3 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
12276 KB |
Output is correct |
| 2 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 3 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 4 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 5 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 6 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 7 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 8 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 10 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 11 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 12 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 13 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 14 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 15 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 17 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 18 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 19 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 20 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 22 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 23 |
Correct |
4 ms |
12120 KB |
Output is correct |
| 24 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 25 |
Correct |
3 ms |
12216 KB |
Output is correct |
| 26 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 27 |
Correct |
4 ms |
12284 KB |
Output is correct |
| 28 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 29 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 30 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 31 |
Correct |
4 ms |
12380 KB |
Output is correct |
| 32 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 33 |
Correct |
4 ms |
12124 KB |
Output is correct |
| 34 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 35 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 36 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 37 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 38 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 39 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 40 |
Correct |
3 ms |
12120 KB |
Output is correct |
| 41 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 42 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 43 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 44 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 45 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 46 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 47 |
Correct |
3 ms |
12376 KB |
Output is correct |
| 48 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 49 |
Correct |
3 ms |
12140 KB |
Output is correct |
| 50 |
Correct |
4 ms |
12200 KB |
Output is correct |
| 51 |
Correct |
3 ms |
12200 KB |
Output is correct |
| 52 |
Correct |
4 ms |
12380 KB |
Output is correct |
| 53 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 54 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 55 |
Correct |
3 ms |
12216 KB |
Output is correct |
| 56 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 57 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 58 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 59 |
Correct |
216 ms |
36084 KB |
Output is correct |
| 60 |
Correct |
279 ms |
38848 KB |
Output is correct |
| 61 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 62 |
Correct |
3 ms |
12124 KB |
Output is correct |
| 63 |
Correct |
183 ms |
33612 KB |
Output is correct |
| 64 |
Correct |
4 ms |
12380 KB |
Output is correct |
| 65 |
Correct |
9 ms |
13916 KB |
Output is correct |
| 66 |
Correct |
81 ms |
27984 KB |
Output is correct |
| 67 |
Correct |
358 ms |
47052 KB |
Output is correct |
| 68 |
Correct |
353 ms |
47824 KB |
Output is correct |
| 69 |
Correct |
7 ms |
12892 KB |
Output is correct |
| 70 |
Correct |
47 ms |
21380 KB |
Output is correct |
| 71 |
Correct |
204 ms |
42012 KB |
Output is correct |
| 72 |
Correct |
195 ms |
40728 KB |
Output is correct |
| 73 |
Correct |
55 ms |
19156 KB |
Output is correct |
| 74 |
Correct |
262 ms |
37780 KB |
Output is correct |
| 75 |
Correct |
17 ms |
15316 KB |
Output is correct |
| 76 |
Correct |
199 ms |
41668 KB |
Output is correct |
| 77 |
Correct |
245 ms |
41644 KB |
Output is correct |
| 78 |
Correct |
25 ms |
15452 KB |
Output is correct |
| 79 |
Correct |
349 ms |
45280 KB |
Output is correct |
| 80 |
Correct |
4 ms |
12376 KB |
Output is correct |
| 81 |
Correct |
55 ms |
21404 KB |
Output is correct |
| 82 |
Correct |
222 ms |
39444 KB |
Output is correct |
| 83 |
Correct |
268 ms |
37828 KB |
Output is correct |
| 84 |
Correct |
262 ms |
37828 KB |
Output is correct |
| 85 |
Correct |
280 ms |
37656 KB |
Output is correct |
| 86 |
Correct |
268 ms |
38824 KB |
Output is correct |
| 87 |
Correct |
282 ms |
38844 KB |
Output is correct |
