답안 #220850

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
220850	2020-04-09T05:12:26 Z	arnold518	Network (BOI15_net)	C++14	100 / 100	548 ms	51956 KB

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 5e5;
const int INF = 987654321;

int N;
vector<int> adj[MAXN+10], V;

void dfs(int now, int bef)
{
	int cnt=0;
	for(int nxt : adj[now])
	{
		if(nxt==bef) continue;
		dfs(nxt, now);
		cnt++;
	}
	if(cnt==0) V.push_back(now);
}

int main()
{
	int i, j;

	scanf("%d", &N);
	for(i=1; i<N; i++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		adj[u].push_back(v);
		adj[v].push_back(u);
	}

	for(i=1; i<=N; i++) if(adj[i].size()>1) break;
	int root=i;
	dfs(root, root);
	
	printf("%d\n", (V.size()+1)/2);
	for(i=0; i<V.size()/2; i++) printf("%d %d\n", V[i], V[i+V.size()/2]);
	if(V.size()%2) printf("%d %d\n", V[0], V.back());
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:43:31: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=]
  printf("%d\n", (V.size()+1)/2);
                 ~~~~~~~~~~~~~~^
net.cpp:44:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0; i<V.size()/2; i++) printf("%d %d\n", V[i], V[i+V.size()/2]);
           ~^~~~~~~~~~~
net.cpp:28:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
net.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ~~~~~^~~~~~~~~~
net.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12032 KB	Output is correct
4	Correct	12 ms	12032 KB	Output is correct
5	Correct	11 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	12 ms	12032 KB	Output is correct
10	Correct	11 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	12 ms	12032 KB	Output is correct
13	Correct	11 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	11 ms	12032 KB	Output is correct
16	Correct	12 ms	12160 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	11 ms	12032 KB	Output is correct
20	Correct	11 ms	12032 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12032 KB	Output is correct
4	Correct	12 ms	12032 KB	Output is correct
5	Correct	11 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	12 ms	12032 KB	Output is correct
10	Correct	11 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	12 ms	12032 KB	Output is correct
13	Correct	11 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	11 ms	12032 KB	Output is correct
16	Correct	12 ms	12160 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	11 ms	12032 KB	Output is correct
20	Correct	11 ms	12032 KB	Output is correct
21	Correct	12 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	13 ms	12160 KB	Output is correct
25	Correct	13 ms	12160 KB	Output is correct
26	Correct	14 ms	12160 KB	Output is correct
27	Correct	13 ms	12160 KB	Output is correct
28	Correct	13 ms	12160 KB	Output is correct
29	Correct	13 ms	12160 KB	Output is correct
30	Correct	12 ms	12032 KB	Output is correct
31	Correct	14 ms	12160 KB	Output is correct
32	Correct	12 ms	12032 KB	Output is correct
33	Correct	12 ms	12032 KB	Output is correct
34	Correct	13 ms	12032 KB	Output is correct
35	Correct	12 ms	12032 KB	Output is correct
36	Correct	12 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	12 ms	12032 KB	Output is correct
42	Correct	12 ms	12032 KB	Output is correct
43	Correct	12 ms	12160 KB	Output is correct
44	Correct	12 ms	12032 KB	Output is correct
45	Correct	12 ms	12032 KB	Output is correct
46	Correct	12 ms	12160 KB	Output is correct
47	Correct	11 ms	12032 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	12 ms	12160 KB	Output is correct
50	Correct	12 ms	12032 KB	Output is correct
51	Correct	11 ms	12032 KB	Output is correct
52	Correct	12 ms	12032 KB	Output is correct
53	Correct	12 ms	12160 KB	Output is correct
54	Correct	12 ms	12032 KB	Output is correct
55	Correct	13 ms	12032 KB	Output is correct
56	Correct	12 ms	12032 KB	Output is correct
57	Correct	12 ms	12032 KB	Output is correct
58	Correct	14 ms	12160 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	12032 KB	Output is correct
2	Correct	11 ms	12032 KB	Output is correct
3	Correct	12 ms	12032 KB	Output is correct
4	Correct	12 ms	12032 KB	Output is correct
5	Correct	11 ms	12032 KB	Output is correct
6	Correct	12 ms	12032 KB	Output is correct
7	Correct	12 ms	12032 KB	Output is correct
8	Correct	12 ms	12032 KB	Output is correct
9	Correct	12 ms	12032 KB	Output is correct
10	Correct	11 ms	12032 KB	Output is correct
11	Correct	12 ms	12032 KB	Output is correct
12	Correct	12 ms	12032 KB	Output is correct
13	Correct	11 ms	12032 KB	Output is correct
14	Correct	12 ms	12032 KB	Output is correct
15	Correct	11 ms	12032 KB	Output is correct
16	Correct	12 ms	12160 KB	Output is correct
17	Correct	12 ms	12032 KB	Output is correct
18	Correct	12 ms	12032 KB	Output is correct
19	Correct	11 ms	12032 KB	Output is correct
20	Correct	11 ms	12032 KB	Output is correct
21	Correct	12 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	13 ms	12160 KB	Output is correct
25	Correct	13 ms	12160 KB	Output is correct
26	Correct	14 ms	12160 KB	Output is correct
27	Correct	13 ms	12160 KB	Output is correct
28	Correct	13 ms	12160 KB	Output is correct
29	Correct	13 ms	12160 KB	Output is correct
30	Correct	12 ms	12032 KB	Output is correct
31	Correct	14 ms	12160 KB	Output is correct
32	Correct	12 ms	12032 KB	Output is correct
33	Correct	12 ms	12032 KB	Output is correct
34	Correct	13 ms	12032 KB	Output is correct
35	Correct	12 ms	12032 KB	Output is correct
36	Correct	12 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	12 ms	12032 KB	Output is correct
42	Correct	12 ms	12032 KB	Output is correct
43	Correct	12 ms	12160 KB	Output is correct
44	Correct	12 ms	12032 KB	Output is correct
45	Correct	12 ms	12032 KB	Output is correct
46	Correct	12 ms	12160 KB	Output is correct
47	Correct	11 ms	12032 KB	Output is correct
48	Correct	12 ms	12160 KB	Output is correct
49	Correct	12 ms	12160 KB	Output is correct
50	Correct	12 ms	12032 KB	Output is correct
51	Correct	11 ms	12032 KB	Output is correct
52	Correct	12 ms	12032 KB	Output is correct
53	Correct	12 ms	12160 KB	Output is correct
54	Correct	12 ms	12032 KB	Output is correct
55	Correct	13 ms	12032 KB	Output is correct
56	Correct	12 ms	12032 KB	Output is correct
57	Correct	12 ms	12032 KB	Output is correct
58	Correct	14 ms	12160 KB	Output is correct
59	Correct	411 ms	36124 KB	Output is correct
60	Correct	485 ms	38760 KB	Output is correct
61	Correct	12 ms	12032 KB	Output is correct
62	Correct	12 ms	12032 KB	Output is correct
63	Correct	357 ms	33768 KB	Output is correct
64	Correct	16 ms	12544 KB	Output is correct
65	Correct	24 ms	14208 KB	Output is correct
66	Correct	167 ms	30584 KB	Output is correct
67	Correct	548 ms	51320 KB	Output is correct
68	Correct	543 ms	51956 KB	Output is correct
69	Correct	19 ms	12928 KB	Output is correct
70	Correct	104 ms	21228 KB	Output is correct
71	Correct	342 ms	42164 KB	Output is correct
72	Correct	381 ms	40816 KB	Output is correct
73	Correct	107 ms	19188 KB	Output is correct
74	Correct	493 ms	37740 KB	Output is correct
75	Correct	39 ms	15224 KB	Output is correct
76	Correct	359 ms	41812 KB	Output is correct
77	Correct	343 ms	41804 KB	Output is correct
78	Correct	42 ms	15864 KB	Output is correct
79	Correct	544 ms	48760 KB	Output is correct
80	Correct	14 ms	12288 KB	Output is correct
81	Correct	123 ms	21360 KB	Output is correct
82	Correct	413 ms	39632 KB	Output is correct
83	Correct	494 ms	37744 KB	Output is correct
84	Correct	517 ms	37996 KB	Output is correct
85	Correct	540 ms	37744 KB	Output is correct
86	Correct	488 ms	38756 KB	Output is correct
87	Correct	496 ms	38828 KB	Output is correct

답안 #220850

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