| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 95942 |
2019-02-04T15:02:49 Z |
luciocf |
Network (BOI15_net) |
C++14 |
|
677 ms |
60424 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)
{
ios::sync_with_stdio(false); cin.tie(0);
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:43:5: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
dfs(root, 0);
~~~^~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12028 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12020 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12124 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12028 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12020 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12072 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12304 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12252 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12076 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12328 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
12 ms |
12148 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
11 ms |
12080 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12140 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12028 KB |
Output is correct |
| 53 |
Correct |
10 ms |
12156 KB |
Output is correct |
| 54 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12152 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12064 KB |
Output is correct |
| 5 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 7 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 8 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 9 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 10 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 11 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 12 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 13 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 14 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 15 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 16 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 17 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 18 |
Correct |
10 ms |
12028 KB |
Output is correct |
| 19 |
Correct |
12 ms |
12020 KB |
Output is correct |
| 20 |
Correct |
11 ms |
12124 KB |
Output is correct |
| 21 |
Correct |
12 ms |
12072 KB |
Output is correct |
| 22 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 23 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 24 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 25 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 26 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 27 |
Correct |
13 ms |
12304 KB |
Output is correct |
| 28 |
Correct |
13 ms |
12252 KB |
Output is correct |
| 29 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 30 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 31 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 32 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 33 |
Correct |
11 ms |
12024 KB |
Output is correct |
| 34 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 35 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 36 |
Correct |
12 ms |
12076 KB |
Output is correct |
| 37 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 38 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 39 |
Correct |
11 ms |
12152 KB |
Output is correct |
| 40 |
Correct |
13 ms |
12328 KB |
Output is correct |
| 41 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 42 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 43 |
Correct |
12 ms |
12148 KB |
Output is correct |
| 44 |
Correct |
12 ms |
12152 KB |
Output is correct |
| 45 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 46 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 47 |
Correct |
12 ms |
12124 KB |
Output is correct |
| 48 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 49 |
Correct |
13 ms |
12152 KB |
Output is correct |
| 50 |
Correct |
11 ms |
12080 KB |
Output is correct |
| 51 |
Correct |
12 ms |
12140 KB |
Output is correct |
| 52 |
Correct |
12 ms |
12028 KB |
Output is correct |
| 53 |
Correct |
10 ms |
12156 KB |
Output is correct |
| 54 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 55 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 56 |
Correct |
10 ms |
12024 KB |
Output is correct |
| 57 |
Correct |
10 ms |
12152 KB |
Output is correct |
| 58 |
Correct |
14 ms |
12152 KB |
Output is correct |
| 59 |
Correct |
378 ms |
31716 KB |
Output is correct |
| 60 |
Correct |
503 ms |
33564 KB |
Output is correct |
| 61 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 62 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 63 |
Correct |
371 ms |
29984 KB |
Output is correct |
| 64 |
Correct |
15 ms |
12536 KB |
Output is correct |
| 65 |
Correct |
21 ms |
13976 KB |
Output is correct |
| 66 |
Correct |
183 ms |
26140 KB |
Output is correct |
| 67 |
Correct |
673 ms |
60424 KB |
Output is correct |
| 68 |
Correct |
629 ms |
50688 KB |
Output is correct |
| 69 |
Correct |
16 ms |
12888 KB |
Output is correct |
| 70 |
Correct |
93 ms |
20632 KB |
Output is correct |
| 71 |
Correct |
323 ms |
36528 KB |
Output is correct |
| 72 |
Correct |
316 ms |
35768 KB |
Output is correct |
| 73 |
Correct |
90 ms |
18808 KB |
Output is correct |
| 74 |
Correct |
558 ms |
32424 KB |
Output is correct |
| 75 |
Correct |
32 ms |
15224 KB |
Output is correct |
| 76 |
Correct |
376 ms |
36264 KB |
Output is correct |
| 77 |
Correct |
313 ms |
36484 KB |
Output is correct |
| 78 |
Correct |
43 ms |
15688 KB |
Output is correct |
| 79 |
Correct |
677 ms |
43484 KB |
Output is correct |
| 80 |
Correct |
14 ms |
12280 KB |
Output is correct |
| 81 |
Correct |
139 ms |
20676 KB |
Output is correct |
| 82 |
Correct |
403 ms |
34476 KB |
Output is correct |
| 83 |
Correct |
521 ms |
32572 KB |
Output is correct |
| 84 |
Correct |
545 ms |
32508 KB |
Output is correct |
| 85 |
Correct |
437 ms |
32380 KB |
Output is correct |
| 86 |
Correct |
413 ms |
33528 KB |
Output is correct |
| 87 |
Correct |
467 ms |
33548 KB |
Output is correct |
