| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 476096 |
2021-09-24T18:38:37 Z |
ZaZo_ |
Network (BOI15_net) |
C++14 |
|
660 ms |
43088 KB |
#include <bits/stdc++.h>
#define HID ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long
#define all(v) v.begin(),v.end()
const int N = 500010 , INF = 1e15 , MOD=1000000006;
using namespace std;
int n ;
vector<int>edges[N];
vector<int>leaves;
void dfs(int node , int par)
{
if(edges[node].size()==1) leaves.push_back(node);
for(auto x : edges[node])
if(x!=par)
dfs(x,node);
}
int32_t main() {
HID
cin>>n;
for(int i = 0 ; i < n-1 ; i++)
{
int u , v;
cin >> u >> v;
edges[u].push_back(v);
edges[v].push_back(u);
}
dfs(1,-1);
cout<<(leaves.size()+1)/2<<endl;
if(leaves.size()%2==0)
{
for(int i = 0 ; i < (leaves.size()+1)/2 ; i++)
cout<<leaves[i]<<" "<<leaves[(leaves.size()+1)/2+i]<<endl;
}
else
{
for(int i = 0 ; i < (leaves.size()+1)/2 ; i++)
{
if((leaves.size()+1)/2+i>=leaves.size()) break;
cout<<leaves[i]<<" "<<leaves[(leaves.size()+1)/2+i]<<endl;
}
cout<<leaves[(leaves.size())/2]<<" ";
for(int i = 1 ; i <= n ; i++)
{
if(i!=leaves[(leaves.size()+1)/2]&&i!=edges[leaves[(leaves.size()+1)/2]][0])
{
cout<<i<<endl;
break;
}
}
}
}
Compilation message
net.cpp: In function 'int32_t main()':
net.cpp:31:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
31 | for(int i = 0 ; i < (leaves.size()+1)/2 ; i++)
| ~~^~~~~~~~~~~~~~~~~~~~~
net.cpp:36:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | for(int i = 0 ; i < (leaves.size()+1)/2 ; i++)
| ~~^~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11948 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11940 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12040 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11948 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12008 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11948 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11940 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12040 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11948 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12008 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12172 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
11 ms |
12148 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12144 KB |
Output is correct |
| 28 |
Correct |
11 ms |
12108 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
10 ms |
12236 KB |
Output is correct |
| 32 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11940 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12044 KB |
Output is correct |
| 47 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
6 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
9 ms |
12108 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11948 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11940 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12040 KB |
Output is correct |
| 12 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 16 |
Correct |
6 ms |
11948 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 20 |
Correct |
6 ms |
12008 KB |
Output is correct |
| 21 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12172 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
11 ms |
12148 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12144 KB |
Output is correct |
| 28 |
Correct |
11 ms |
12108 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 30 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 31 |
Correct |
10 ms |
12236 KB |
Output is correct |
| 32 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 33 |
Correct |
6 ms |
11940 KB |
Output is correct |
| 34 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 39 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12108 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 46 |
Correct |
8 ms |
12044 KB |
Output is correct |
| 47 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 50 |
Correct |
7 ms |
12016 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
6 ms |
12108 KB |
Output is correct |
| 54 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 55 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 59 |
Correct |
548 ms |
34564 KB |
Output is correct |
| 60 |
Correct |
614 ms |
36780 KB |
Output is correct |
| 61 |
Correct |
6 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
8 ms |
11964 KB |
Output is correct |
| 63 |
Correct |
506 ms |
31424 KB |
Output is correct |
| 64 |
Correct |
8 ms |
12364 KB |
Output is correct |
| 65 |
Correct |
16 ms |
13660 KB |
Output is correct |
| 66 |
Correct |
122 ms |
25644 KB |
Output is correct |
| 67 |
Correct |
439 ms |
40388 KB |
Output is correct |
| 68 |
Correct |
490 ms |
41900 KB |
Output is correct |
| 69 |
Correct |
21 ms |
12876 KB |
Output is correct |
| 70 |
Correct |
182 ms |
21192 KB |
Output is correct |
| 71 |
Correct |
635 ms |
39148 KB |
Output is correct |
| 72 |
Correct |
654 ms |
37952 KB |
Output is correct |
| 73 |
Correct |
121 ms |
18384 KB |
Output is correct |
| 74 |
Correct |
559 ms |
34448 KB |
Output is correct |
| 75 |
Correct |
63 ms |
15028 KB |
Output is correct |
| 76 |
Correct |
617 ms |
38520 KB |
Output is correct |
| 77 |
Correct |
601 ms |
39076 KB |
Output is correct |
| 78 |
Correct |
38 ms |
15008 KB |
Output is correct |
| 79 |
Correct |
452 ms |
38548 KB |
Output is correct |
| 80 |
Correct |
10 ms |
12236 KB |
Output is correct |
| 81 |
Correct |
218 ms |
22452 KB |
Output is correct |
| 82 |
Correct |
619 ms |
43088 KB |
Output is correct |
| 83 |
Correct |
596 ms |
40756 KB |
Output is correct |
| 84 |
Correct |
601 ms |
40808 KB |
Output is correct |
| 85 |
Correct |
595 ms |
40844 KB |
Output is correct |
| 86 |
Correct |
644 ms |
43004 KB |
Output is correct |
| 87 |
Correct |
660 ms |
43056 KB |
Output is correct |
