# |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
634779 |
2022-08-25T00:12:22 Z |
tvladm2009 |
Network (BOI15_net) |
C++14 |
|
611 ms |
65464 KB |
#include <iostream>
#include <vector>
using namespace std;
const int MAX_N = 5 * 1e5;
vector<int> g[MAX_N + 1], leaves;
int n;
void dfs(int u, int p = -1) {
for (int v : g[u]) {
if (v != p) {
dfs(v, u);
}
}
if (g[u].size() == 1) {
leaves.push_back(u);
}
}
int main() {
cin >> n;
for (int i = 1; i <= n - 1; i++) {
int u, v;
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
int root = 0;
for (int i = 1; i <= n; i++) {
if (g[i].size() > 1) {
root = i;
}
}
dfs(root);
cout << (leaves.size() + 1) / 2 << "\n";
int cnt = leaves.size() / 2;
for (int i = 0; i < cnt; i++) {
cout << leaves[i] << " " << leaves[i + cnt + leaves.size() % 2] << "\n";
}
if (leaves.size() % 2 == 1) {
cout << root << " " << leaves[cnt] << "\n";
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
12008 KB |
Output is correct |
3 |
Correct |
8 ms |
12024 KB |
Output is correct |
4 |
Correct |
8 ms |
12036 KB |
Output is correct |
5 |
Correct |
7 ms |
11988 KB |
Output is correct |
6 |
Correct |
6 ms |
11920 KB |
Output is correct |
7 |
Correct |
7 ms |
12044 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
8 ms |
12044 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
8 ms |
11988 KB |
Output is correct |
12 |
Correct |
6 ms |
11988 KB |
Output is correct |
13 |
Correct |
7 ms |
12040 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11972 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
7 ms |
11960 KB |
Output is correct |
18 |
Correct |
6 ms |
11988 KB |
Output is correct |
19 |
Correct |
7 ms |
11988 KB |
Output is correct |
20 |
Correct |
7 ms |
12040 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
12008 KB |
Output is correct |
3 |
Correct |
8 ms |
12024 KB |
Output is correct |
4 |
Correct |
8 ms |
12036 KB |
Output is correct |
5 |
Correct |
7 ms |
11988 KB |
Output is correct |
6 |
Correct |
6 ms |
11920 KB |
Output is correct |
7 |
Correct |
7 ms |
12044 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
8 ms |
12044 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
8 ms |
11988 KB |
Output is correct |
12 |
Correct |
6 ms |
11988 KB |
Output is correct |
13 |
Correct |
7 ms |
12040 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11972 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
7 ms |
11960 KB |
Output is correct |
18 |
Correct |
6 ms |
11988 KB |
Output is correct |
19 |
Correct |
7 ms |
11988 KB |
Output is correct |
20 |
Correct |
7 ms |
12040 KB |
Output is correct |
21 |
Correct |
7 ms |
11988 KB |
Output is correct |
22 |
Correct |
8 ms |
12116 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
8 ms |
12052 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
7 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12116 KB |
Output is correct |
28 |
Correct |
8 ms |
12056 KB |
Output is correct |
29 |
Correct |
7 ms |
12056 KB |
Output is correct |
30 |
Correct |
6 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
6 ms |
11988 KB |
Output is correct |
33 |
Correct |
7 ms |
12048 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
7 ms |
12048 KB |
Output is correct |
36 |
Correct |
6 ms |
12044 KB |
Output is correct |
37 |
Correct |
7 ms |
12000 KB |
Output is correct |
38 |
Correct |
7 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
12044 KB |
Output is correct |
40 |
Correct |
7 ms |
11988 KB |
Output is correct |
41 |
Correct |
7 ms |
11988 KB |
Output is correct |
42 |
Correct |
7 ms |
12044 KB |
Output is correct |
43 |
Correct |
7 ms |
11988 KB |
Output is correct |
44 |
Correct |
7 ms |
11988 KB |
Output is correct |
45 |
Correct |
6 ms |
12044 KB |
Output is correct |
46 |
Correct |
7 ms |
12044 KB |
Output is correct |
47 |
Correct |
6 ms |
11988 KB |
Output is correct |
48 |
Correct |
6 ms |
11988 KB |
Output is correct |
49 |
Correct |
7 ms |
12024 KB |
Output is correct |
50 |
Correct |
6 ms |
12044 KB |
Output is correct |
51 |
Correct |
6 ms |
12048 KB |
Output is correct |
52 |
Correct |
7 ms |
12044 KB |
Output is correct |
53 |
Correct |
7 ms |
11988 KB |
Output is correct |
54 |
Correct |
8 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 |
12044 KB |
Output is correct |
58 |
Correct |
9 ms |
12040 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
11988 KB |
Output is correct |
2 |
Correct |
6 ms |
12008 KB |
Output is correct |
3 |
Correct |
8 ms |
12024 KB |
Output is correct |
4 |
Correct |
8 ms |
12036 KB |
Output is correct |
5 |
Correct |
7 ms |
11988 KB |
Output is correct |
6 |
Correct |
6 ms |
11920 KB |
Output is correct |
7 |
Correct |
7 ms |
12044 KB |
Output is correct |
8 |
Correct |
7 ms |
11988 KB |
Output is correct |
9 |
Correct |
8 ms |
12044 KB |
Output is correct |
10 |
Correct |
7 ms |
11988 KB |
Output is correct |
11 |
Correct |
8 ms |
11988 KB |
Output is correct |
12 |
Correct |
6 ms |
11988 KB |
Output is correct |
13 |
Correct |
7 ms |
12040 KB |
Output is correct |
14 |
Correct |
6 ms |
11988 KB |
Output is correct |
15 |
Correct |
6 ms |
11972 KB |
Output is correct |
16 |
Correct |
6 ms |
11988 KB |
Output is correct |
17 |
Correct |
7 ms |
11960 KB |
Output is correct |
18 |
Correct |
6 ms |
11988 KB |
Output is correct |
19 |
Correct |
7 ms |
11988 KB |
Output is correct |
20 |
Correct |
7 ms |
12040 KB |
Output is correct |
21 |
Correct |
7 ms |
11988 KB |
Output is correct |
22 |
Correct |
8 ms |
12116 KB |
Output is correct |
23 |
Correct |
7 ms |
12116 KB |
Output is correct |
24 |
Correct |
8 ms |
12052 KB |
Output is correct |
25 |
Correct |
7 ms |
12116 KB |
Output is correct |
26 |
Correct |
7 ms |
12116 KB |
Output is correct |
27 |
Correct |
7 ms |
12116 KB |
Output is correct |
28 |
Correct |
8 ms |
12056 KB |
Output is correct |
29 |
Correct |
7 ms |
12056 KB |
Output is correct |
30 |
Correct |
6 ms |
11988 KB |
Output is correct |
31 |
Correct |
7 ms |
12116 KB |
Output is correct |
32 |
Correct |
6 ms |
11988 KB |
Output is correct |
33 |
Correct |
7 ms |
12048 KB |
Output is correct |
34 |
Correct |
6 ms |
11988 KB |
Output is correct |
35 |
Correct |
7 ms |
12048 KB |
Output is correct |
36 |
Correct |
6 ms |
12044 KB |
Output is correct |
37 |
Correct |
7 ms |
12000 KB |
Output is correct |
38 |
Correct |
7 ms |
12116 KB |
Output is correct |
39 |
Correct |
7 ms |
12044 KB |
Output is correct |
40 |
Correct |
7 ms |
11988 KB |
Output is correct |
41 |
Correct |
7 ms |
11988 KB |
Output is correct |
42 |
Correct |
7 ms |
12044 KB |
Output is correct |
43 |
Correct |
7 ms |
11988 KB |
Output is correct |
44 |
Correct |
7 ms |
11988 KB |
Output is correct |
45 |
Correct |
6 ms |
12044 KB |
Output is correct |
46 |
Correct |
7 ms |
12044 KB |
Output is correct |
47 |
Correct |
6 ms |
11988 KB |
Output is correct |
48 |
Correct |
6 ms |
11988 KB |
Output is correct |
49 |
Correct |
7 ms |
12024 KB |
Output is correct |
50 |
Correct |
6 ms |
12044 KB |
Output is correct |
51 |
Correct |
6 ms |
12048 KB |
Output is correct |
52 |
Correct |
7 ms |
12044 KB |
Output is correct |
53 |
Correct |
7 ms |
11988 KB |
Output is correct |
54 |
Correct |
8 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 |
12044 KB |
Output is correct |
58 |
Correct |
9 ms |
12040 KB |
Output is correct |
59 |
Correct |
458 ms |
35936 KB |
Output is correct |
60 |
Correct |
546 ms |
38744 KB |
Output is correct |
61 |
Correct |
6 ms |
11988 KB |
Output is correct |
62 |
Correct |
8 ms |
12048 KB |
Output is correct |
63 |
Correct |
414 ms |
33612 KB |
Output is correct |
64 |
Correct |
10 ms |
12436 KB |
Output is correct |
65 |
Correct |
23 ms |
13876 KB |
Output is correct |
66 |
Correct |
177 ms |
26756 KB |
Output is correct |
67 |
Correct |
611 ms |
65464 KB |
Output is correct |
68 |
Correct |
608 ms |
55756 KB |
Output is correct |
69 |
Correct |
16 ms |
12884 KB |
Output is correct |
70 |
Correct |
169 ms |
21208 KB |
Output is correct |
71 |
Correct |
434 ms |
41756 KB |
Output is correct |
72 |
Correct |
434 ms |
40600 KB |
Output is correct |
73 |
Correct |
113 ms |
19012 KB |
Output is correct |
74 |
Correct |
591 ms |
37648 KB |
Output is correct |
75 |
Correct |
44 ms |
15124 KB |
Output is correct |
76 |
Correct |
454 ms |
41516 KB |
Output is correct |
77 |
Correct |
442 ms |
41636 KB |
Output is correct |
78 |
Correct |
66 ms |
15628 KB |
Output is correct |
79 |
Correct |
599 ms |
48660 KB |
Output is correct |
80 |
Correct |
10 ms |
12244 KB |
Output is correct |
81 |
Correct |
152 ms |
21224 KB |
Output is correct |
82 |
Correct |
487 ms |
39512 KB |
Output is correct |
83 |
Correct |
558 ms |
37712 KB |
Output is correct |
84 |
Correct |
554 ms |
37576 KB |
Output is correct |
85 |
Correct |
538 ms |
37628 KB |
Output is correct |
86 |
Correct |
551 ms |
38696 KB |
Output is correct |
87 |
Correct |
542 ms |
38700 KB |
Output is correct |