Submission #118579

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
118579	2019-06-19T09:13:35 Z	dolphingarlic	Network (BOI15_net)	C++14	100 / 100	926 ms	47860 KB

#include <bits/stdc++.h>
using namespace std;

vector<int> graph[500001], leaves;

void dfs(int node = 1, int parent = 0) {
	// cout << node << ' ' << parent << '\n';
	if (graph[node].size() == 1) leaves.push_back(node);
	for (int i : graph[node]) {
		if (i == parent) continue;
		dfs(i, node);
	}
}

int main() {
	int n;
	cin >> n;
	for (int i = 0; i < n - 1; i++) {
		int a, b;
		cin >> a >> b;
		graph[a].push_back(b);
		graph[b].push_back(a);
	}
	// for (int i : graph[4]) cout << i << ' ';
	// cout << '\n';
	dfs();
	// for (int i : leaves) cout << i << ' ';
	// cout << '\n';
	cout << (leaves.size() + 1) / 2 << '\n';
	for (int i = 0; i < (leaves.size() + 1) / 2; i++) cout << leaves[i] << ' ' << leaves[i + leaves.size() / 2] << '\n';
	return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < (leaves.size() + 1) / 2; i++) cout << leaves[i] << ' ' << leaves[i + leaves.size() / 2] << '\n';
                  ~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12160 KB	Output is correct
4	Correct	11 ms	12032 KB	Output is correct
5	Correct	12 ms	12032 KB	Output is correct
6	Correct	11 ms	12032 KB	Output is correct
7	Correct	11 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	15 ms	12060 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	14 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	11992 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12160 KB	Output is correct
4	Correct	11 ms	12032 KB	Output is correct
5	Correct	12 ms	12032 KB	Output is correct
6	Correct	11 ms	12032 KB	Output is correct
7	Correct	11 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	15 ms	12060 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	14 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	11992 KB	Output is correct
21	Correct	13 ms	12032 KB	Output is correct
22	Correct	13 ms	12160 KB	Output is correct
23	Correct	13 ms	12160 KB	Output is correct
24	Correct	14 ms	12160 KB	Output is correct
25	Correct	14 ms	12160 KB	Output is correct
26	Correct	19 ms	12152 KB	Output is correct
27	Correct	15 ms	12152 KB	Output is correct
28	Correct	13 ms	12160 KB	Output is correct
29	Correct	13 ms	12160 KB	Output is correct
30	Correct	13 ms	12032 KB	Output is correct
31	Correct	15 ms	12160 KB	Output is correct
32	Correct	13 ms	12032 KB	Output is correct
33	Correct	13 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	12 ms	12004 KB	Output is correct
36	Correct	13 ms	12032 KB	Output is correct
37	Correct	12 ms	12160 KB	Output is correct
38	Correct	12 ms	12160 KB	Output is correct
39	Correct	12 ms	12032 KB	Output is correct
40	Correct	12 ms	12032 KB	Output is correct
41	Correct	13 ms	12032 KB	Output is correct
42	Correct	12 ms	12032 KB	Output is correct
43	Correct	12 ms	12032 KB	Output is correct
44	Correct	12 ms	12032 KB	Output is correct
45	Correct	13 ms	12032 KB	Output is correct
46	Correct	14 ms	12160 KB	Output is correct
47	Correct	13 ms	12032 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	14 ms	12160 KB	Output is correct
50	Correct	13 ms	12152 KB	Output is correct
51	Correct	13 ms	12032 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	12 ms	12032 KB	Output is correct
55	Correct	12 ms	12160 KB	Output is correct
56	Correct	12 ms	12032 KB	Output is correct
57	Correct	13 ms	12160 KB	Output is correct
58	Correct	13 ms	12160 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12160 KB	Output is correct
4	Correct	11 ms	12032 KB	Output is correct
5	Correct	12 ms	12032 KB	Output is correct
6	Correct	11 ms	12032 KB	Output is correct
7	Correct	11 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	15 ms	12060 KB	Output is correct
10	Correct	12 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	13 ms	12032 KB	Output is correct
13	Correct	14 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	12 ms	12032 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	12 ms	12032 KB	Output is correct
20	Correct	13 ms	11992 KB	Output is correct
21	Correct	13 ms	12032 KB	Output is correct
22	Correct	13 ms	12160 KB	Output is correct
23	Correct	13 ms	12160 KB	Output is correct
24	Correct	14 ms	12160 KB	Output is correct
25	Correct	14 ms	12160 KB	Output is correct
26	Correct	19 ms	12152 KB	Output is correct
27	Correct	15 ms	12152 KB	Output is correct
28	Correct	13 ms	12160 KB	Output is correct
29	Correct	13 ms	12160 KB	Output is correct
30	Correct	13 ms	12032 KB	Output is correct
31	Correct	15 ms	12160 KB	Output is correct
32	Correct	13 ms	12032 KB	Output is correct
33	Correct	13 ms	12032 KB	Output is correct
34	Correct	12 ms	12032 KB	Output is correct
35	Correct	12 ms	12004 KB	Output is correct
36	Correct	13 ms	12032 KB	Output is correct
37	Correct	12 ms	12160 KB	Output is correct
38	Correct	12 ms	12160 KB	Output is correct
39	Correct	12 ms	12032 KB	Output is correct
40	Correct	12 ms	12032 KB	Output is correct
41	Correct	13 ms	12032 KB	Output is correct
42	Correct	12 ms	12032 KB	Output is correct
43	Correct	12 ms	12032 KB	Output is correct
44	Correct	12 ms	12032 KB	Output is correct
45	Correct	13 ms	12032 KB	Output is correct
46	Correct	14 ms	12160 KB	Output is correct
47	Correct	13 ms	12032 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	14 ms	12160 KB	Output is correct
50	Correct	13 ms	12152 KB	Output is correct
51	Correct	13 ms	12032 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	13 ms	12160 KB	Output is correct
54	Correct	12 ms	12032 KB	Output is correct
55	Correct	12 ms	12160 KB	Output is correct
56	Correct	12 ms	12032 KB	Output is correct
57	Correct	13 ms	12160 KB	Output is correct
58	Correct	13 ms	12160 KB	Output is correct
59	Correct	611 ms	36144 KB	Output is correct
60	Correct	729 ms	39016 KB	Output is correct
61	Correct	13 ms	12032 KB	Output is correct
62	Correct	12 ms	12032 KB	Output is correct
63	Correct	531 ms	33588 KB	Output is correct
64	Correct	15 ms	12544 KB	Output is correct
65	Correct	36 ms	14032 KB	Output is correct
66	Correct	274 ms	27896 KB	Output is correct
67	Correct	839 ms	47080 KB	Output is correct
68	Correct	892 ms	47860 KB	Output is correct
69	Correct	27 ms	12920 KB	Output is correct
70	Correct	181 ms	21460 KB	Output is correct
71	Correct	578 ms	41844 KB	Output is correct
72	Correct	583 ms	40800 KB	Output is correct
73	Correct	180 ms	19056 KB	Output is correct
74	Correct	767 ms	37884 KB	Output is correct
75	Correct	67 ms	15352 KB	Output is correct
76	Correct	607 ms	41492 KB	Output is correct
77	Correct	603 ms	41680 KB	Output is correct
78	Correct	80 ms	15352 KB	Output is correct
79	Correct	926 ms	45432 KB	Output is correct
80	Correct	16 ms	12288 KB	Output is correct
81	Correct	226 ms	21340 KB	Output is correct
82	Correct	709 ms	39528 KB	Output is correct
83	Correct	750 ms	37796 KB	Output is correct
84	Correct	746 ms	37744 KB	Output is correct
85	Correct	785 ms	37780 KB	Output is correct
86	Correct	760 ms	38884 KB	Output is correct
87	Correct	744 ms	38888 KB	Output is correct

Submission #118579

Compilation message

Subtask #1 18.0 / 18.0

Subtask #2 45.0 / 45.0

Subtask #3 37.0 / 37.0

Subtask #1
18.0 / 18.0

Subtask #2
45.0 / 45.0

Subtask #3
37.0 / 37.0