Submission #24995

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
24995	2017-06-19T17:13:03 Z	minimario	Network (BOI15_net)	C++14	100 / 100	703 ms	42508 KB

#include <bits/stdc++.h>

using namespace std;

const int MAX = 500000;
vector<int> g[MAX];
vector<int> order;

void dfs(int u, int p) {
	for (int i : g[u]) {
		if (i == p) { continue; }
		dfs(i, u);
	}
	if (g[u].size() == 1) { order.push_back(u); }
}

int main() {
	/*
	freopen("a.in", "r", stdin);
	freopen("a.out", "w", stdout);
	*/
	int n; scanf("%d", &n);
	for (int i = 0; i < n-1; ++i)
	{
		int u, v; scanf("%d %d", &u, &v);
		u--; v--;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	dfs(0, -1);
	for (int i = 0; i < order.size(); ++i)
	{
		order[i]++;
	}
	printf("%d\n", ((int)order.size()+1)/2);
	for (int i = 0; i < ((int)order.size())/2; ++i) 
	{
		printf("%d %d\n", order[i], order[i+(order.size())/2]);
	}
	if (order.size() % 2 == 1) { printf("%d %d\n", order[0], order.back()); }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:31:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < order.size(); ++i)
                    ^
net.cpp:22:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n; scanf("%d", &n);
                        ^
net.cpp:25:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int u, v; scanf("%d %d", &u, &v);
                                   ^

Subtask #1
18.0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	13736 KB	Output is correct
2	Correct	0 ms	13736 KB	Output is correct
3	Correct	0 ms	13736 KB	Output is correct
4	Correct	0 ms	13736 KB	Output is correct
5	Correct	0 ms	13736 KB	Output is correct
6	Correct	0 ms	13736 KB	Output is correct
7	Correct	3 ms	13736 KB	Output is correct
8	Correct	0 ms	13736 KB	Output is correct
9	Correct	0 ms	13736 KB	Output is correct
10	Correct	3 ms	13736 KB	Output is correct
11	Correct	0 ms	13736 KB	Output is correct
12	Correct	6 ms	13736 KB	Output is correct
13	Correct	0 ms	13736 KB	Output is correct
14	Correct	6 ms	13736 KB	Output is correct
15	Correct	3 ms	13736 KB	Output is correct
16	Correct	0 ms	13736 KB	Output is correct
17	Correct	6 ms	13736 KB	Output is correct
18	Correct	0 ms	13736 KB	Output is correct
19	Correct	6 ms	13736 KB	Output is correct
20	Correct	0 ms	13736 KB	Output is correct

Subtask #2
45.0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	13736 KB	Output is correct
2	Correct	0 ms	13736 KB	Output is correct
3	Correct	0 ms	13736 KB	Output is correct
4	Correct	0 ms	13736 KB	Output is correct
5	Correct	0 ms	13736 KB	Output is correct
6	Correct	0 ms	13736 KB	Output is correct
7	Correct	3 ms	13736 KB	Output is correct
8	Correct	0 ms	13736 KB	Output is correct
9	Correct	0 ms	13736 KB	Output is correct
10	Correct	3 ms	13736 KB	Output is correct
11	Correct	0 ms	13736 KB	Output is correct
12	Correct	6 ms	13736 KB	Output is correct
13	Correct	0 ms	13736 KB	Output is correct
14	Correct	6 ms	13736 KB	Output is correct
15	Correct	3 ms	13736 KB	Output is correct
16	Correct	0 ms	13736 KB	Output is correct
17	Correct	6 ms	13736 KB	Output is correct
18	Correct	0 ms	13736 KB	Output is correct
19	Correct	6 ms	13736 KB	Output is correct
20	Correct	0 ms	13736 KB	Output is correct
21	Correct	0 ms	13736 KB	Output is correct
22	Correct	6 ms	13868 KB	Output is correct
23	Correct	6 ms	13868 KB	Output is correct
24	Correct	9 ms	13868 KB	Output is correct
25	Correct	0 ms	13868 KB	Output is correct
26	Correct	0 ms	13868 KB	Output is correct
27	Correct	3 ms	13868 KB	Output is correct
28	Correct	3 ms	13868 KB	Output is correct
29	Correct	3 ms	13868 KB	Output is correct
30	Correct	6 ms	13736 KB	Output is correct
31	Correct	0 ms	13868 KB	Output is correct
32	Correct	0 ms	13736 KB	Output is correct
33	Correct	3 ms	13736 KB	Output is correct
34	Correct	3 ms	13736 KB	Output is correct
35	Correct	0 ms	13736 KB	Output is correct
36	Correct	0 ms	13736 KB	Output is correct
37	Correct	3 ms	13736 KB	Output is correct
38	Correct	0 ms	13736 KB	Output is correct
39	Correct	0 ms	13736 KB	Output is correct
40	Correct	0 ms	13736 KB	Output is correct
41	Correct	6 ms	13736 KB	Output is correct
42	Correct	3 ms	13736 KB	Output is correct
43	Correct	3 ms	13736 KB	Output is correct
44	Correct	3 ms	13736 KB	Output is correct
45	Correct	0 ms	13736 KB	Output is correct
46	Correct	6 ms	13736 KB	Output is correct
47	Correct	3 ms	13736 KB	Output is correct
48	Correct	0 ms	13736 KB	Output is correct
49	Correct	3 ms	13736 KB	Output is correct
50	Correct	6 ms	13736 KB	Output is correct
51	Correct	6 ms	13736 KB	Output is correct
52	Correct	3 ms	13736 KB	Output is correct
53	Correct	0 ms	13736 KB	Output is correct
54	Correct	0 ms	13736 KB	Output is correct
55	Correct	0 ms	13736 KB	Output is correct
56	Correct	6 ms	13736 KB	Output is correct
57	Correct	3 ms	13736 KB	Output is correct
58	Correct	0 ms	13868 KB	Output is correct

Subtask #3
37.0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	13736 KB	Output is correct
2	Correct	0 ms	13736 KB	Output is correct
3	Correct	0 ms	13736 KB	Output is correct
4	Correct	0 ms	13736 KB	Output is correct
5	Correct	0 ms	13736 KB	Output is correct
6	Correct	0 ms	13736 KB	Output is correct
7	Correct	3 ms	13736 KB	Output is correct
8	Correct	0 ms	13736 KB	Output is correct
9	Correct	0 ms	13736 KB	Output is correct
10	Correct	3 ms	13736 KB	Output is correct
11	Correct	0 ms	13736 KB	Output is correct
12	Correct	6 ms	13736 KB	Output is correct
13	Correct	0 ms	13736 KB	Output is correct
14	Correct	6 ms	13736 KB	Output is correct
15	Correct	3 ms	13736 KB	Output is correct
16	Correct	0 ms	13736 KB	Output is correct
17	Correct	6 ms	13736 KB	Output is correct
18	Correct	0 ms	13736 KB	Output is correct
19	Correct	6 ms	13736 KB	Output is correct
20	Correct	0 ms	13736 KB	Output is correct
21	Correct	0 ms	13736 KB	Output is correct
22	Correct	6 ms	13868 KB	Output is correct
23	Correct	6 ms	13868 KB	Output is correct
24	Correct	9 ms	13868 KB	Output is correct
25	Correct	0 ms	13868 KB	Output is correct
26	Correct	0 ms	13868 KB	Output is correct
27	Correct	3 ms	13868 KB	Output is correct
28	Correct	3 ms	13868 KB	Output is correct
29	Correct	3 ms	13868 KB	Output is correct
30	Correct	6 ms	13736 KB	Output is correct
31	Correct	0 ms	13868 KB	Output is correct
32	Correct	0 ms	13736 KB	Output is correct
33	Correct	3 ms	13736 KB	Output is correct
34	Correct	3 ms	13736 KB	Output is correct
35	Correct	0 ms	13736 KB	Output is correct
36	Correct	0 ms	13736 KB	Output is correct
37	Correct	3 ms	13736 KB	Output is correct
38	Correct	0 ms	13736 KB	Output is correct
39	Correct	0 ms	13736 KB	Output is correct
40	Correct	0 ms	13736 KB	Output is correct
41	Correct	6 ms	13736 KB	Output is correct
42	Correct	3 ms	13736 KB	Output is correct
43	Correct	3 ms	13736 KB	Output is correct
44	Correct	3 ms	13736 KB	Output is correct
45	Correct	0 ms	13736 KB	Output is correct
46	Correct	6 ms	13736 KB	Output is correct
47	Correct	3 ms	13736 KB	Output is correct
48	Correct	0 ms	13736 KB	Output is correct
49	Correct	3 ms	13736 KB	Output is correct
50	Correct	6 ms	13736 KB	Output is correct
51	Correct	6 ms	13736 KB	Output is correct
52	Correct	3 ms	13736 KB	Output is correct
53	Correct	0 ms	13736 KB	Output is correct
54	Correct	0 ms	13736 KB	Output is correct
55	Correct	0 ms	13736 KB	Output is correct
56	Correct	6 ms	13736 KB	Output is correct
57	Correct	3 ms	13736 KB	Output is correct
58	Correct	0 ms	13868 KB	Output is correct
59	Correct	579 ms	31984 KB	Output is correct
60	Correct	623 ms	33248 KB	Output is correct
61	Correct	0 ms	13736 KB	Output is correct
62	Correct	0 ms	13736 KB	Output is correct
63	Correct	403 ms	29908 KB	Output is correct
64	Correct	9 ms	13976 KB	Output is correct
65	Correct	23 ms	15252 KB	Output is correct
66	Correct	239 ms	27248 KB	Output is correct
67	Correct	703 ms	41752 KB	Output is correct
68	Correct	629 ms	42508 KB	Output is correct
69	Correct	9 ms	14472 KB	Output is correct
70	Correct	116 ms	21892 KB	Output is correct
71	Correct	386 ms	35588 KB	Output is correct
72	Correct	429 ms	35588 KB	Output is correct
73	Correct	139 ms	19092 KB	Output is correct
74	Correct	619 ms	31532 KB	Output is correct
75	Correct	36 ms	16200 KB	Output is correct
76	Correct	419 ms	34572 KB	Output is correct
77	Correct	413 ms	34572 KB	Output is correct
78	Correct	39 ms	16212 KB	Output is correct
79	Correct	643 ms	40012 KB	Output is correct
80	Correct	9 ms	13868 KB	Output is correct
81	Correct	149 ms	20764 KB	Output is correct
82	Correct	516 ms	33816 KB	Output is correct
83	Correct	596 ms	31532 KB	Output is correct
84	Correct	569 ms	31532 KB	Output is correct
85	Correct	573 ms	31532 KB	Output is correct
86	Correct	583 ms	33252 KB	Output is correct
87	Correct	569 ms	33252 KB	Output is correct

Submission #24995

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