| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 655922 |
2022-11-06T05:38:19 Z |
Farbod |
Network (BOI15_net) |
C++17 |
|
438 ms |
47516 KB |
/*
* In the name of God
*
* Author: Farbod Doost
* Last Modified: Sun, 06 Nov 2022 (09:07:00)
*
*/
#include <iostream>
#include <vector>
using namespace std;
const int N = 5e5 + 1;
int n;
vector <int> adj[N], vec;
void dfs(int v, int p)
{
for (auto u: adj[v])
if (u != p)
dfs(u, v);
if (adj[v].size() == 1)
vec.push_back(v);
return;
}
signed main()
{
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n;
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v, u--, v--;
adj[u].push_back(v),
adj[v].push_back(u);
}
int idx = -1;
for (int i = 0; i < n; i++)
if (adj[i].size() > 1) {
dfs(i, i), idx = i;
break;
}
int tmp = ((int)vec.size() + 1) / 2;
cout << tmp << '\n';
for (int i = 0; i < tmp - (vec.size() % 2); i++)
cout << vec[i] + 1 << ' ' << vec[i + tmp] + 1 << '\n';
if ((int)vec.size() % 2 == 1)
cout << vec[tmp - 1] + 1 << ' ' << idx + 1 << '\n';
return 0;
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:52:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
52 | for (int i = 0; i < tmp - (vec.size() % 2); i++)
| ~~^~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
6 ms |
11988 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12184 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 24 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12092 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
7 ms |
12076 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12076 KB |
Output is correct |
| 30 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12120 KB |
Output is correct |
| 32 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11984 KB |
Output is correct |
| 34 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 35 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 36 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 37 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 40 |
Correct |
6 ms |
12036 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12060 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 46 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 47 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
9 ms |
11940 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12104 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12076 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 2 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 3 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 5 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 6 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 7 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 8 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 9 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 10 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 11 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 12 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 13 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 14 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 15 |
Correct |
6 ms |
12064 KB |
Output is correct |
| 16 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 17 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 18 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 19 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 20 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 21 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 22 |
Correct |
7 ms |
12184 KB |
Output is correct |
| 23 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 24 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 25 |
Correct |
8 ms |
12092 KB |
Output is correct |
| 26 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 27 |
Correct |
7 ms |
12076 KB |
Output is correct |
| 28 |
Correct |
9 ms |
12160 KB |
Output is correct |
| 29 |
Correct |
8 ms |
12076 KB |
Output is correct |
| 30 |
Correct |
6 ms |
12056 KB |
Output is correct |
| 31 |
Correct |
8 ms |
12120 KB |
Output is correct |
| 32 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 33 |
Correct |
7 ms |
11984 KB |
Output is correct |
| 34 |
Correct |
6 ms |
12068 KB |
Output is correct |
| 35 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 36 |
Correct |
8 ms |
12064 KB |
Output is correct |
| 37 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 38 |
Correct |
6 ms |
12116 KB |
Output is correct |
| 39 |
Correct |
7 ms |
12064 KB |
Output is correct |
| 40 |
Correct |
6 ms |
12036 KB |
Output is correct |
| 41 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 42 |
Correct |
9 ms |
12060 KB |
Output is correct |
| 43 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 44 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 45 |
Correct |
7 ms |
12068 KB |
Output is correct |
| 46 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 47 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 48 |
Correct |
7 ms |
12060 KB |
Output is correct |
| 49 |
Correct |
7 ms |
12116 KB |
Output is correct |
| 50 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 51 |
Correct |
9 ms |
11940 KB |
Output is correct |
| 52 |
Correct |
8 ms |
11988 KB |
Output is correct |
| 53 |
Correct |
7 ms |
12104 KB |
Output is correct |
| 54 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 55 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 56 |
Correct |
6 ms |
11988 KB |
Output is correct |
| 57 |
Correct |
7 ms |
11980 KB |
Output is correct |
| 58 |
Correct |
7 ms |
12076 KB |
Output is correct |
| 59 |
Correct |
334 ms |
32180 KB |
Output is correct |
| 60 |
Correct |
425 ms |
34364 KB |
Output is correct |
| 61 |
Correct |
7 ms |
11988 KB |
Output is correct |
| 62 |
Correct |
9 ms |
12112 KB |
Output is correct |
| 63 |
Correct |
260 ms |
30444 KB |
Output is correct |
| 64 |
Correct |
8 ms |
12500 KB |
Output is correct |
| 65 |
Correct |
14 ms |
14124 KB |
Output is correct |
| 66 |
Correct |
131 ms |
30228 KB |
Output is correct |
| 67 |
Correct |
411 ms |
46676 KB |
Output is correct |
| 68 |
Correct |
438 ms |
47516 KB |
Output is correct |
| 69 |
Correct |
11 ms |
12848 KB |
Output is correct |
| 70 |
Correct |
72 ms |
21080 KB |
Output is correct |
| 71 |
Correct |
277 ms |
37356 KB |
Output is correct |
| 72 |
Correct |
314 ms |
36604 KB |
Output is correct |
| 73 |
Correct |
91 ms |
19000 KB |
Output is correct |
| 74 |
Correct |
345 ms |
33220 KB |
Output is correct |
| 75 |
Correct |
24 ms |
15180 KB |
Output is correct |
| 76 |
Correct |
245 ms |
37076 KB |
Output is correct |
| 77 |
Correct |
239 ms |
37124 KB |
Output is correct |
| 78 |
Correct |
26 ms |
15828 KB |
Output is correct |
| 79 |
Correct |
405 ms |
44204 KB |
Output is correct |
| 80 |
Correct |
8 ms |
12244 KB |
Output is correct |
| 81 |
Correct |
78 ms |
20816 KB |
Output is correct |
| 82 |
Correct |
298 ms |
35008 KB |
Output is correct |
| 83 |
Correct |
354 ms |
32956 KB |
Output is correct |
| 84 |
Correct |
358 ms |
33088 KB |
Output is correct |
| 85 |
Correct |
348 ms |
33048 KB |
Output is correct |
| 86 |
Correct |
375 ms |
34188 KB |
Output is correct |
| 87 |
Correct |
353 ms |
33756 KB |
Output is correct |
