| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 477860 |
2021-10-04T08:37:51 Z |
prvocislo |
Network (BOI15_net) |
C++17 |
|
464 ms |
42328 KB |
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#include <iostream>
#include <vector>
using namespace std;
const int maxn = 5e5 + 5;
vector<int> l, g[maxn];
void dfs(int u, int p = -1)
{
if (g[u].size() == 1) l.push_back(u);
for (int v : g[u]) if (v != p)
dfs(v, u);
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
for (int i = 0, a, b; i < n - 1; i++)
cin >> a >> b, g[a].push_back(b), g[b].push_back(a);
int root = -1;
for (int i = 1; i <= n; i++) if (g[i].size() > 1)
{
root = i;
break;
}
dfs(root);
cout << (l.size() + 1) / 2 << "\n";
for (int i = 0; i < l.size() / 2; i++)
cout << l[i] << " " << l[l.size() / 2 + i] << "\n";
if (l.size() & 1)
cout << l[0] << " " << l.back() << "\n";
return 0;
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:84:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
84 | for (int i = 0; i < l.size() / 2; i++)
| ~~^~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
9 ms |
12052 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 12 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11996 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
9 ms |
12052 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 12 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 21 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12168 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12052 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 35 |
Correct |
8 ms |
12016 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12020 KB |
Output is correct |
| 37 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12096 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 40 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 44 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 46 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12048 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
9 ms |
12004 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 53 |
Correct |
8 ms |
12048 KB |
Output is correct |
| 54 |
Correct |
8 ms |
12052 KB |
Output is correct |
| 55 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 58 |
Correct |
9 ms |
12108 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 2 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 3 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 5 |
Correct |
7 ms |
12056 KB |
Output is correct |
| 6 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 7 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 8 |
Correct |
9 ms |
12052 KB |
Output is correct |
| 9 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 10 |
Correct |
8 ms |
12060 KB |
Output is correct |
| 11 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 12 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 14 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 15 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 16 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 17 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 18 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 19 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 20 |
Correct |
7 ms |
11996 KB |
Output is correct |
| 21 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 22 |
Correct |
8 ms |
12168 KB |
Output is correct |
| 23 |
Correct |
8 ms |
12052 KB |
Output is correct |
| 24 |
Correct |
9 ms |
12068 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12108 KB |
Output is correct |
| 26 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 27 |
Correct |
8 ms |
12056 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 29 |
Correct |
9 ms |
12116 KB |
Output is correct |
| 30 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12160 KB |
Output is correct |
| 32 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 34 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 35 |
Correct |
8 ms |
12016 KB |
Output is correct |
| 36 |
Correct |
7 ms |
12020 KB |
Output is correct |
| 37 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
7 ms |
12096 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12052 KB |
Output is correct |
| 40 |
Correct |
8 ms |
12032 KB |
Output is correct |
| 41 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 42 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 44 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 46 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 47 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12048 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
9 ms |
12004 KB |
Output is correct |
| 51 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 52 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 53 |
Correct |
8 ms |
12048 KB |
Output is correct |
| 54 |
Correct |
8 ms |
12052 KB |
Output is correct |
| 55 |
Correct |
8 ms |
11980 KB |
Output is correct |
| 56 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 57 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 58 |
Correct |
9 ms |
12108 KB |
Output is correct |
| 59 |
Correct |
328 ms |
31212 KB |
Output is correct |
| 60 |
Correct |
401 ms |
33428 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 62 |
Correct |
9 ms |
11980 KB |
Output is correct |
| 63 |
Correct |
277 ms |
29496 KB |
Output is correct |
| 64 |
Correct |
10 ms |
12364 KB |
Output is correct |
| 65 |
Correct |
20 ms |
13928 KB |
Output is correct |
| 66 |
Correct |
127 ms |
26820 KB |
Output is correct |
| 67 |
Correct |
464 ms |
41484 KB |
Output is correct |
| 68 |
Correct |
462 ms |
42328 KB |
Output is correct |
| 69 |
Correct |
13 ms |
12876 KB |
Output is correct |
| 70 |
Correct |
80 ms |
20432 KB |
Output is correct |
| 71 |
Correct |
279 ms |
36292 KB |
Output is correct |
| 72 |
Correct |
292 ms |
35592 KB |
Output is correct |
| 73 |
Correct |
80 ms |
18628 KB |
Output is correct |
| 74 |
Correct |
429 ms |
32248 KB |
Output is correct |
| 75 |
Correct |
33 ms |
15172 KB |
Output is correct |
| 76 |
Correct |
303 ms |
36052 KB |
Output is correct |
| 77 |
Correct |
289 ms |
36384 KB |
Output is correct |
| 78 |
Correct |
34 ms |
15536 KB |
Output is correct |
| 79 |
Correct |
459 ms |
39872 KB |
Output is correct |
| 80 |
Correct |
10 ms |
12236 KB |
Output is correct |
| 81 |
Correct |
97 ms |
20364 KB |
Output is correct |
| 82 |
Correct |
359 ms |
34364 KB |
Output is correct |
| 83 |
Correct |
400 ms |
32180 KB |
Output is correct |
| 84 |
Correct |
398 ms |
32276 KB |
Output is correct |
| 85 |
Correct |
397 ms |
32312 KB |
Output is correct |
| 86 |
Correct |
401 ms |
33436 KB |
Output is correct |
| 87 |
Correct |
405 ms |
33256 KB |
Output is correct |
