Submission #160528

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
160528	2019-10-28T10:29:37 Z	dolphingarlic	Network (BOI15_net)	C++14	100 / 100	1018 ms	47860 KB

#include <bits/stdc++.h>
using namespace std;
 
vector<int> graph[500001], leaves;
 
void dfs(int node = 1, int parent = 0) {
	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);
	}
	dfs();

	cout << (leaves.size() + 1) / 2 << '\n';
	for (int i = 0; i + leaves.size() / 2 < leaves.size(); i++) cout << leaves[i] << ' ' << leaves[i + leaves.size() / 2] << '\n';
	return 0;
}

Subtask #1
18.0 / 18.0

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

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	13 ms	12024 KB	Output is correct
3	Correct	14 ms	12024 KB	Output is correct
4	Correct	13 ms	12024 KB	Output is correct
5	Correct	12 ms	12024 KB	Output is correct
6	Correct	12 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	12 ms	12024 KB	Output is correct
9	Correct	12 ms	12024 KB	Output is correct
10	Correct	14 ms	12024 KB	Output is correct
11	Correct	12 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	12 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	12 ms	12024 KB	Output is correct
19	Correct	12 ms	12024 KB	Output is correct
20	Correct	13 ms	12024 KB	Output is correct
21	Correct	13 ms	12024 KB	Output is correct
22	Correct	15 ms	12152 KB	Output is correct
23	Correct	15 ms	12280 KB	Output is correct
24	Correct	16 ms	12152 KB	Output is correct
25	Correct	14 ms	12152 KB	Output is correct
26	Correct	14 ms	12152 KB	Output is correct
27	Correct	16 ms	12152 KB	Output is correct
28	Correct	15 ms	12152 KB	Output is correct
29	Correct	14 ms	12152 KB	Output is correct
30	Correct	13 ms	11996 KB	Output is correct
31	Correct	15 ms	12152 KB	Output is correct
32	Correct	14 ms	12048 KB	Output is correct
33	Correct	13 ms	12024 KB	Output is correct
34	Correct	13 ms	12024 KB	Output is correct
35	Correct	14 ms	12024 KB	Output is correct
36	Correct	13 ms	12024 KB	Output is correct
37	Correct	14 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	12 ms	12028 KB	Output is correct
40	Correct	13 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12152 KB	Output is correct
43	Correct	13 ms	12024 KB	Output is correct
44	Correct	13 ms	11996 KB	Output is correct
45	Correct	12 ms	12152 KB	Output is correct
46	Correct	15 ms	12152 KB	Output is correct
47	Correct	13 ms	12024 KB	Output is correct
48	Correct	12 ms	12024 KB	Output is correct
49	Correct	13 ms	12152 KB	Output is correct
50	Correct	12 ms	12024 KB	Output is correct
51	Correct	12 ms	12024 KB	Output is correct
52	Correct	12 ms	12028 KB	Output is correct
53	Correct	14 ms	12124 KB	Output is correct
54	Correct	12 ms	12024 KB	Output is correct
55	Correct	13 ms	12152 KB	Output is correct
56	Correct	12 ms	11896 KB	Output is correct
57	Correct	13 ms	12152 KB	Output is correct
58	Correct	15 ms	12124 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	13 ms	12024 KB	Output is correct
2	Correct	13 ms	12024 KB	Output is correct
3	Correct	14 ms	12024 KB	Output is correct
4	Correct	13 ms	12024 KB	Output is correct
5	Correct	12 ms	12024 KB	Output is correct
6	Correct	12 ms	12024 KB	Output is correct
7	Correct	13 ms	12024 KB	Output is correct
8	Correct	12 ms	12024 KB	Output is correct
9	Correct	12 ms	12024 KB	Output is correct
10	Correct	14 ms	12024 KB	Output is correct
11	Correct	12 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	12 ms	12024 KB	Output is correct
15	Correct	12 ms	12024 KB	Output is correct
16	Correct	13 ms	12024 KB	Output is correct
17	Correct	12 ms	12024 KB	Output is correct
18	Correct	12 ms	12024 KB	Output is correct
19	Correct	12 ms	12024 KB	Output is correct
20	Correct	13 ms	12024 KB	Output is correct
21	Correct	13 ms	12024 KB	Output is correct
22	Correct	15 ms	12152 KB	Output is correct
23	Correct	15 ms	12280 KB	Output is correct
24	Correct	16 ms	12152 KB	Output is correct
25	Correct	14 ms	12152 KB	Output is correct
26	Correct	14 ms	12152 KB	Output is correct
27	Correct	16 ms	12152 KB	Output is correct
28	Correct	15 ms	12152 KB	Output is correct
29	Correct	14 ms	12152 KB	Output is correct
30	Correct	13 ms	11996 KB	Output is correct
31	Correct	15 ms	12152 KB	Output is correct
32	Correct	14 ms	12048 KB	Output is correct
33	Correct	13 ms	12024 KB	Output is correct
34	Correct	13 ms	12024 KB	Output is correct
35	Correct	14 ms	12024 KB	Output is correct
36	Correct	13 ms	12024 KB	Output is correct
37	Correct	14 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	12 ms	12028 KB	Output is correct
40	Correct	13 ms	12024 KB	Output is correct
41	Correct	13 ms	12024 KB	Output is correct
42	Correct	13 ms	12152 KB	Output is correct
43	Correct	13 ms	12024 KB	Output is correct
44	Correct	13 ms	11996 KB	Output is correct
45	Correct	12 ms	12152 KB	Output is correct
46	Correct	15 ms	12152 KB	Output is correct
47	Correct	13 ms	12024 KB	Output is correct
48	Correct	12 ms	12024 KB	Output is correct
49	Correct	13 ms	12152 KB	Output is correct
50	Correct	12 ms	12024 KB	Output is correct
51	Correct	12 ms	12024 KB	Output is correct
52	Correct	12 ms	12028 KB	Output is correct
53	Correct	14 ms	12124 KB	Output is correct
54	Correct	12 ms	12024 KB	Output is correct
55	Correct	13 ms	12152 KB	Output is correct
56	Correct	12 ms	11896 KB	Output is correct
57	Correct	13 ms	12152 KB	Output is correct
58	Correct	15 ms	12124 KB	Output is correct
59	Correct	818 ms	36288 KB	Output is correct
60	Correct	940 ms	38888 KB	Output is correct
61	Correct	12 ms	12024 KB	Output is correct
62	Correct	14 ms	12028 KB	Output is correct
63	Correct	725 ms	33772 KB	Output is correct
64	Correct	18 ms	12536 KB	Output is correct
65	Correct	44 ms	14072 KB	Output is correct
66	Correct	330 ms	28068 KB	Output is correct
67	Correct	1012 ms	47096 KB	Output is correct
68	Correct	1012 ms	47860 KB	Output is correct
69	Correct	32 ms	12920 KB	Output is correct
70	Correct	253 ms	21464 KB	Output is correct
71	Correct	805 ms	41980 KB	Output is correct
72	Correct	788 ms	40928 KB	Output is correct
73	Correct	237 ms	19184 KB	Output is correct
74	Correct	969 ms	38044 KB	Output is correct
75	Correct	95 ms	15352 KB	Output is correct
76	Correct	948 ms	41700 KB	Output is correct
77	Correct	818 ms	41888 KB	Output is correct
78	Correct	95 ms	15352 KB	Output is correct
79	Correct	1018 ms	45364 KB	Output is correct
80	Correct	18 ms	12280 KB	Output is correct
81	Correct	289 ms	21460 KB	Output is correct
82	Correct	868 ms	39696 KB	Output is correct
83	Correct	954 ms	37844 KB	Output is correct
84	Correct	934 ms	37832 KB	Output is correct
85	Correct	948 ms	37820 KB	Output is correct
86	Correct	942 ms	38944 KB	Output is correct
87	Correct	945 ms	38880 KB	Output is correct

Submission #160528

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