답안 #120012

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
120012	2019-06-23T00:47:44 Z	E869120	Network (BOI15_net)	C++14	100 / 100	951 ms	54892 KB

#include <iostream>
#include <vector>
using namespace std;
#pragma warning (disable: 4996)

int N, A[1 << 19], B[1 << 19]; bool used[1 << 19];
vector<int> G[1 << 19], I;

void dfs(int pos) {
	if (used[pos] == true) return;
	used[pos] = true;
	if (G[pos].size() == 1) I.push_back(pos);
	for (int i = 0; i < G[pos].size(); i++) dfs(G[pos][i]);
}

int main() {
	scanf("%d", &N);
	for (int i = 1; i <= N - 1; i++) {
		scanf("%d%d", &A[i], &B[i]);
		G[A[i]].push_back(B[i]);
		G[B[i]].push_back(A[i]);
	}
	int root = -1;
	for (int i = 1; i <= N; i++) {
		if (G[i].size() >= 2) root = i;
	}
	dfs(root);
	int mid = I.size() / 2;
	cout << I.size() - mid << endl;
	for (int i = 0; i < I.size() - mid; i++) cout << I[i] << " " << I[i + mid] << endl;
	return 0;
}

Compilation message

net.cpp:4:0: warning: ignoring #pragma warning  [-Wunknown-pragmas]
 #pragma warning (disable: 4996)
 
net.cpp: In function 'void dfs(int)':
net.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < G[pos].size(); i++) dfs(G[pos][i]);
                  ~~^~~~~~~~~~~~~~~
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 < I.size() - mid; i++) cout << I[i] << " " << I[i + mid] << endl;
                  ~~^~~~~~~~~~~~~~~~
net.cpp:17:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ~~~~~^~~~~~~~~~
net.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &A[i], &B[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12672 KB	Output is correct
2	Correct	12 ms	12672 KB	Output is correct
3	Correct	13 ms	12672 KB	Output is correct
4	Correct	14 ms	12800 KB	Output is correct
5	Correct	11 ms	12672 KB	Output is correct
6	Correct	11 ms	12672 KB	Output is correct
7	Correct	12 ms	12672 KB	Output is correct
8	Correct	12 ms	12672 KB	Output is correct
9	Correct	12 ms	12672 KB	Output is correct
10	Correct	12 ms	12672 KB	Output is correct
11	Correct	12 ms	12672 KB	Output is correct
12	Correct	12 ms	12672 KB	Output is correct
13	Correct	26 ms	12664 KB	Output is correct
14	Correct	12 ms	12672 KB	Output is correct
15	Correct	13 ms	12672 KB	Output is correct
16	Correct	12 ms	12672 KB	Output is correct
17	Correct	12 ms	12672 KB	Output is correct
18	Correct	12 ms	12672 KB	Output is correct
19	Correct	11 ms	12672 KB	Output is correct
20	Correct	11 ms	12672 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12672 KB	Output is correct
2	Correct	12 ms	12672 KB	Output is correct
3	Correct	13 ms	12672 KB	Output is correct
4	Correct	14 ms	12800 KB	Output is correct
5	Correct	11 ms	12672 KB	Output is correct
6	Correct	11 ms	12672 KB	Output is correct
7	Correct	12 ms	12672 KB	Output is correct
8	Correct	12 ms	12672 KB	Output is correct
9	Correct	12 ms	12672 KB	Output is correct
10	Correct	12 ms	12672 KB	Output is correct
11	Correct	12 ms	12672 KB	Output is correct
12	Correct	12 ms	12672 KB	Output is correct
13	Correct	26 ms	12664 KB	Output is correct
14	Correct	12 ms	12672 KB	Output is correct
15	Correct	13 ms	12672 KB	Output is correct
16	Correct	12 ms	12672 KB	Output is correct
17	Correct	12 ms	12672 KB	Output is correct
18	Correct	12 ms	12672 KB	Output is correct
19	Correct	11 ms	12672 KB	Output is correct
20	Correct	11 ms	12672 KB	Output is correct
21	Correct	12 ms	12672 KB	Output is correct
22	Correct	14 ms	12800 KB	Output is correct
23	Correct	15 ms	12708 KB	Output is correct
24	Correct	15 ms	12800 KB	Output is correct
25	Correct	14 ms	12672 KB	Output is correct
26	Correct	15 ms	12672 KB	Output is correct
27	Correct	14 ms	12800 KB	Output is correct
28	Correct	14 ms	12800 KB	Output is correct
29	Correct	13 ms	12672 KB	Output is correct
30	Correct	13 ms	12672 KB	Output is correct
31	Correct	14 ms	12800 KB	Output is correct
32	Correct	12 ms	12672 KB	Output is correct
33	Correct	12 ms	12672 KB	Output is correct
34	Correct	12 ms	12672 KB	Output is correct
35	Correct	13 ms	12748 KB	Output is correct
36	Correct	12 ms	12672 KB	Output is correct
37	Correct	12 ms	12672 KB	Output is correct
38	Correct	12 ms	12800 KB	Output is correct
39	Correct	12 ms	12748 KB	Output is correct
40	Correct	12 ms	12672 KB	Output is correct
41	Correct	12 ms	12672 KB	Output is correct
42	Correct	13 ms	12672 KB	Output is correct
43	Correct	13 ms	12672 KB	Output is correct
44	Correct	13 ms	12672 KB	Output is correct
45	Correct	12 ms	12672 KB	Output is correct
46	Correct	13 ms	12672 KB	Output is correct
47	Correct	12 ms	12672 KB	Output is correct
48	Correct	12 ms	12672 KB	Output is correct
49	Correct	13 ms	12672 KB	Output is correct
50	Correct	13 ms	12644 KB	Output is correct
51	Correct	12 ms	12656 KB	Output is correct
52	Correct	13 ms	12672 KB	Output is correct
53	Correct	12 ms	12672 KB	Output is correct
54	Correct	11 ms	12672 KB	Output is correct
55	Correct	12 ms	12672 KB	Output is correct
56	Correct	12 ms	12672 KB	Output is correct
57	Correct	13 ms	12672 KB	Output is correct
58	Correct	14 ms	12716 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	13 ms	12672 KB	Output is correct
2	Correct	12 ms	12672 KB	Output is correct
3	Correct	13 ms	12672 KB	Output is correct
4	Correct	14 ms	12800 KB	Output is correct
5	Correct	11 ms	12672 KB	Output is correct
6	Correct	11 ms	12672 KB	Output is correct
7	Correct	12 ms	12672 KB	Output is correct
8	Correct	12 ms	12672 KB	Output is correct
9	Correct	12 ms	12672 KB	Output is correct
10	Correct	12 ms	12672 KB	Output is correct
11	Correct	12 ms	12672 KB	Output is correct
12	Correct	12 ms	12672 KB	Output is correct
13	Correct	26 ms	12664 KB	Output is correct
14	Correct	12 ms	12672 KB	Output is correct
15	Correct	13 ms	12672 KB	Output is correct
16	Correct	12 ms	12672 KB	Output is correct
17	Correct	12 ms	12672 KB	Output is correct
18	Correct	12 ms	12672 KB	Output is correct
19	Correct	11 ms	12672 KB	Output is correct
20	Correct	11 ms	12672 KB	Output is correct
21	Correct	12 ms	12672 KB	Output is correct
22	Correct	14 ms	12800 KB	Output is correct
23	Correct	15 ms	12708 KB	Output is correct
24	Correct	15 ms	12800 KB	Output is correct
25	Correct	14 ms	12672 KB	Output is correct
26	Correct	15 ms	12672 KB	Output is correct
27	Correct	14 ms	12800 KB	Output is correct
28	Correct	14 ms	12800 KB	Output is correct
29	Correct	13 ms	12672 KB	Output is correct
30	Correct	13 ms	12672 KB	Output is correct
31	Correct	14 ms	12800 KB	Output is correct
32	Correct	12 ms	12672 KB	Output is correct
33	Correct	12 ms	12672 KB	Output is correct
34	Correct	12 ms	12672 KB	Output is correct
35	Correct	13 ms	12748 KB	Output is correct
36	Correct	12 ms	12672 KB	Output is correct
37	Correct	12 ms	12672 KB	Output is correct
38	Correct	12 ms	12800 KB	Output is correct
39	Correct	12 ms	12748 KB	Output is correct
40	Correct	12 ms	12672 KB	Output is correct
41	Correct	12 ms	12672 KB	Output is correct
42	Correct	13 ms	12672 KB	Output is correct
43	Correct	13 ms	12672 KB	Output is correct
44	Correct	13 ms	12672 KB	Output is correct
45	Correct	12 ms	12672 KB	Output is correct
46	Correct	13 ms	12672 KB	Output is correct
47	Correct	12 ms	12672 KB	Output is correct
48	Correct	12 ms	12672 KB	Output is correct
49	Correct	13 ms	12672 KB	Output is correct
50	Correct	13 ms	12644 KB	Output is correct
51	Correct	12 ms	12656 KB	Output is correct
52	Correct	13 ms	12672 KB	Output is correct
53	Correct	12 ms	12672 KB	Output is correct
54	Correct	11 ms	12672 KB	Output is correct
55	Correct	12 ms	12672 KB	Output is correct
56	Correct	12 ms	12672 KB	Output is correct
57	Correct	13 ms	12672 KB	Output is correct
58	Correct	14 ms	12716 KB	Output is correct
59	Correct	654 ms	40668 KB	Output is correct
60	Correct	748 ms	43912 KB	Output is correct
61	Correct	11 ms	12672 KB	Output is correct
62	Correct	11 ms	12672 KB	Output is correct
63	Correct	592 ms	37736 KB	Output is correct
64	Correct	14 ms	12928 KB	Output is correct
65	Correct	29 ms	14336 KB	Output is correct
66	Correct	181 ms	25720 KB	Output is correct
67	Correct	605 ms	54892 KB	Output is correct
68	Correct	613 ms	50432 KB	Output is correct
69	Correct	30 ms	13696 KB	Output is correct
70	Correct	198 ms	23400 KB	Output is correct
71	Correct	673 ms	46976 KB	Output is correct
72	Correct	679 ms	45712 KB	Output is correct
73	Correct	161 ms	20976 KB	Output is correct
74	Correct	731 ms	42820 KB	Output is correct
75	Correct	69 ms	16376 KB	Output is correct
76	Correct	669 ms	46544 KB	Output is correct
77	Correct	712 ms	46676 KB	Output is correct
78	Correct	53 ms	16248 KB	Output is correct
79	Correct	634 ms	46456 KB	Output is correct
80	Correct	16 ms	12928 KB	Output is correct
81	Correct	224 ms	23340 KB	Output is correct
82	Correct	704 ms	44644 KB	Output is correct
83	Correct	718 ms	42608 KB	Output is correct
84	Correct	695 ms	42736 KB	Output is correct
85	Correct	717 ms	42864 KB	Output is correct
86	Correct	951 ms	43876 KB	Output is correct
87	Correct	794 ms	43892 KB	Output is correct

답안 #120012

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