| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 95937 |
2019-02-04T14:50:39 Z |
luciocf |
Network (BOI15_net) |
C++14 |
|
857 ms |
65600 KB |
#include <bits/stdc++.h>
using namespace std;
const int maxn = 5e5+10;
typedef pair<int, int> pii;
int leaf[maxn], tt;
vector<int> grafo[maxn];
void dfs(int u, int p)
{
for (auto v: grafo[u])
{
if (v == p) continue;
dfs(v, u);
}
if (grafo[u].size() == 1) leaf[++tt] = u;
}
int main(void)
{
int n;
cin >> n;
for (int i = 1; i < n; i++)
{
int u, v;
cin >> u >> v;
grafo[u].push_back(v);
grafo[v].push_back(u);
}
int root;
for (int i = 1; i <= n; i++)
if (grafo[i].size() > 1) root = i;
dfs(root, 0);
int ans = (tt+1)/2;
cout << ans << "\n";
for (int i = 1; i < ans; i++)
cout << leaf[i] << " " << leaf[i+ans] << "\n";
if (tt&1) cout << leaf[ans] << " " << leaf[1] << "\n";
else cout << leaf[ans] << " " << leaf[tt] << "\n";
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:42:5: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
dfs(root, 0);
~~~^~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12000 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12128 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12040 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12000 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12128 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12040 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 26 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 27 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 29 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 33 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 35 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 40 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 42 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 47 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 56 |
Correct |
12 ms |
11896 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12000 KB |
Output is correct |
| 2 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 4 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 5 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
13 ms |
12124 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 11 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12128 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 14 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 16 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 18 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12040 KB |
Output is correct |
| 20 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12280 KB |
Output is correct |
| 23 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 26 |
Correct |
12 ms |
12280 KB |
Output is correct |
| 27 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 28 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 29 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 33 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 35 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 40 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 41 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 42 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 44 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 45 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 47 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 49 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 52 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 53 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 54 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
13 ms |
12024 KB |
Output is correct |
| 56 |
Correct |
12 ms |
11896 KB |
Output is correct |
| 57 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 59 |
Correct |
642 ms |
35992 KB |
Output is correct |
| 60 |
Correct |
779 ms |
38648 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 63 |
Correct |
555 ms |
33520 KB |
Output is correct |
| 64 |
Correct |
16 ms |
12536 KB |
Output is correct |
| 65 |
Correct |
33 ms |
14072 KB |
Output is correct |
| 66 |
Correct |
278 ms |
26908 KB |
Output is correct |
| 67 |
Correct |
786 ms |
65600 KB |
Output is correct |
| 68 |
Correct |
744 ms |
56024 KB |
Output is correct |
| 69 |
Correct |
25 ms |
12920 KB |
Output is correct |
| 70 |
Correct |
180 ms |
21148 KB |
Output is correct |
| 71 |
Correct |
640 ms |
41700 KB |
Output is correct |
| 72 |
Correct |
595 ms |
40752 KB |
Output is correct |
| 73 |
Correct |
184 ms |
18980 KB |
Output is correct |
| 74 |
Correct |
686 ms |
37624 KB |
Output is correct |
| 75 |
Correct |
62 ms |
15096 KB |
Output is correct |
| 76 |
Correct |
586 ms |
41480 KB |
Output is correct |
| 77 |
Correct |
585 ms |
41456 KB |
Output is correct |
| 78 |
Correct |
70 ms |
15608 KB |
Output is correct |
| 79 |
Correct |
857 ms |
48756 KB |
Output is correct |
| 80 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 81 |
Correct |
178 ms |
21232 KB |
Output is correct |
| 82 |
Correct |
649 ms |
39404 KB |
Output is correct |
| 83 |
Correct |
715 ms |
37608 KB |
Output is correct |
| 84 |
Correct |
662 ms |
37696 KB |
Output is correct |
| 85 |
Correct |
747 ms |
37496 KB |
Output is correct |
| 86 |
Correct |
766 ms |
38640 KB |
Output is correct |
| 87 |
Correct |
770 ms |
38648 KB |
Output is correct |
