| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 405213 |
2021-05-16T00:23:18 Z |
soba |
Network (BOI15_net) |
C++14 |
|
725 ms |
47776 KB |
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<int>v[500001] , leafs;
void dfs(int node , int p )
{
if(v[node].size()==1)
{
leafs.push_back(node);
}
for(int u : v[node])
{
if(u!=p)
{
dfs(u , node);
}
}
return;
}
int main()
{
int n , x, y ;
cin >>n ;
for(int i = 0 ; i < n-1; i++)
{
cin >> x >>y ;
v[x].push_back(y);
v[y].push_back(x);
}
dfs(1 , -1);
int sz= leafs.size();
if(sz&1)
{
cout << sz/2 +1 << "\n";
}
else cout << sz/2 << "\n";
for(int i = 0 ; i < (sz/2) ; i++)
{
cout << leafs[i] << " " << leafs[i+((sz+1)/2)] << "\n";
}
if(sz&1)
{
cout << leafs[sz/2] << " " <<1 << "\n";
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 3 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11976 KB |
Output is correct |
| 5 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 12 |
Correct |
8 ms |
12044 KB |
Output is correct |
| 13 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
9 ms |
12044 KB |
Output is correct |
| 15 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 17 |
Correct |
8 ms |
12040 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
11924 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11980 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 3 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11976 KB |
Output is correct |
| 5 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 12 |
Correct |
8 ms |
12044 KB |
Output is correct |
| 13 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
9 ms |
12044 KB |
Output is correct |
| 15 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 17 |
Correct |
8 ms |
12040 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
11924 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 22 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
10 ms |
12060 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
10 ms |
12088 KB |
Output is correct |
| 28 |
Correct |
10 ms |
12044 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11936 KB |
Output is correct |
| 31 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 33 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 34 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
9 ms |
12076 KB |
Output is correct |
| 38 |
Correct |
9 ms |
12044 KB |
Output is correct |
| 39 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
10 ms |
12040 KB |
Output is correct |
| 41 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12040 KB |
Output is correct |
| 43 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 44 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
9 ms |
11992 KB |
Output is correct |
| 46 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 47 |
Correct |
8 ms |
11984 KB |
Output is correct |
| 48 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 50 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
9 ms |
12036 KB |
Output is correct |
| 54 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
9 ms |
12036 KB |
Output is correct |
| 58 |
Correct |
10 ms |
12052 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 3 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11976 KB |
Output is correct |
| 5 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 6 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 9 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 11 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 12 |
Correct |
8 ms |
12044 KB |
Output is correct |
| 13 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
9 ms |
12044 KB |
Output is correct |
| 15 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 16 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 17 |
Correct |
8 ms |
12040 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
11924 KB |
Output is correct |
| 20 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 21 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 22 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 23 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 24 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 25 |
Correct |
10 ms |
12060 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
10 ms |
12088 KB |
Output is correct |
| 28 |
Correct |
10 ms |
12044 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11936 KB |
Output is correct |
| 31 |
Correct |
10 ms |
12108 KB |
Output is correct |
| 32 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 33 |
Correct |
8 ms |
12036 KB |
Output is correct |
| 34 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 35 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 36 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 37 |
Correct |
9 ms |
12076 KB |
Output is correct |
| 38 |
Correct |
9 ms |
12044 KB |
Output is correct |
| 39 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 40 |
Correct |
10 ms |
12040 KB |
Output is correct |
| 41 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12040 KB |
Output is correct |
| 43 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 44 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 45 |
Correct |
9 ms |
11992 KB |
Output is correct |
| 46 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 47 |
Correct |
8 ms |
11984 KB |
Output is correct |
| 48 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 49 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 50 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 52 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 53 |
Correct |
9 ms |
12036 KB |
Output is correct |
| 54 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
9 ms |
12036 KB |
Output is correct |
| 58 |
Correct |
10 ms |
12052 KB |
Output is correct |
| 59 |
Correct |
595 ms |
36024 KB |
Output is correct |
| 60 |
Correct |
679 ms |
38832 KB |
Output is correct |
| 61 |
Correct |
10 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 63 |
Correct |
535 ms |
33480 KB |
Output is correct |
| 64 |
Correct |
12 ms |
12456 KB |
Output is correct |
| 65 |
Correct |
29 ms |
13872 KB |
Output is correct |
| 66 |
Correct |
225 ms |
27768 KB |
Output is correct |
| 67 |
Correct |
725 ms |
46892 KB |
Output is correct |
| 68 |
Correct |
720 ms |
47776 KB |
Output is correct |
| 69 |
Correct |
21 ms |
12788 KB |
Output is correct |
| 70 |
Correct |
176 ms |
21168 KB |
Output is correct |
| 71 |
Correct |
566 ms |
41800 KB |
Output is correct |
| 72 |
Correct |
583 ms |
40564 KB |
Output is correct |
| 73 |
Correct |
152 ms |
19000 KB |
Output is correct |
| 74 |
Correct |
688 ms |
37836 KB |
Output is correct |
| 75 |
Correct |
58 ms |
15172 KB |
Output is correct |
| 76 |
Correct |
570 ms |
41496 KB |
Output is correct |
| 77 |
Correct |
557 ms |
41608 KB |
Output is correct |
| 78 |
Correct |
57 ms |
15316 KB |
Output is correct |
| 79 |
Correct |
713 ms |
45252 KB |
Output is correct |
| 80 |
Correct |
11 ms |
12236 KB |
Output is correct |
| 81 |
Correct |
184 ms |
21244 KB |
Output is correct |
| 82 |
Correct |
624 ms |
39552 KB |
Output is correct |
| 83 |
Correct |
682 ms |
37644 KB |
Output is correct |
| 84 |
Correct |
675 ms |
37824 KB |
Output is correct |
| 85 |
Correct |
701 ms |
37564 KB |
Output is correct |
| 86 |
Correct |
677 ms |
38732 KB |
Output is correct |
| 87 |
Correct |
680 ms |
38652 KB |
Output is correct |
