답안 #209546

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
209546	2020-03-14T14:01:01 Z	DodgeBallMan	Network (BOI15_net)	C++14	100 / 100	580 ms	47732 KB

#include <bits/stdc++.h>

using namespace std;

const int N = 5e5 + 10;
int n;
vector<int> g[N], lf;

void dfs( int u, int p ) { if( g[u].size() == 1 ) lf.emplace_back( u ); for( int v : g[u] ) if( v != p ) dfs( v, u ); }

int main()
{
    scanf("%d",&n);
    for( int i = 1, a, b ; i < n ; i++ ) {
        scanf("%d %d",&a,&b);
        g[a].emplace_back( b ), g[b].emplace_back( a );
    }
    dfs( 1, 0 );
    printf("%d\n",lf.size()/2 + ( lf.size() % 2 ) );
    for( int i = 0 ; i < lf.size()/2 ; i++ ) printf("%d %d\n",lf[i],lf[i+(lf.size()/2)]);
    if( lf.size() % 2 ) printf("%d %d\n",lf[0],lf[lf.size()-1]);
    return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:19:51: 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",lf.size()/2 + ( lf.size() % 2 ) );
                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
net.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for( int i = 0 ; i < lf.size()/2 ; i++ ) printf("%d %d\n",lf[i],lf[i+(lf.size()/2)]);
                      ~~^~~~~~~~~~~~~
net.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
net.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&a,&b);
         ~~~~~^~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	12 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	12 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	12 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	13 ms	12024 KB	Output is correct
16	Correct	12 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	12 ms	12024 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	12 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	12 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	12 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	13 ms	12024 KB	Output is correct
16	Correct	12 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	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	13 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	13 ms	12152 KB	Output is correct
25	Correct	13 ms	12152 KB	Output is correct
26	Correct	13 ms	12152 KB	Output is correct
27	Correct	14 ms	12152 KB	Output is correct
28	Correct	13 ms	12152 KB	Output is correct
29	Correct	13 ms	12156 KB	Output is correct
30	Correct	12 ms	12024 KB	Output is correct
31	Correct	13 ms	12152 KB	Output is correct
32	Correct	12 ms	12024 KB	Output is correct
33	Correct	12 ms	12024 KB	Output is correct
34	Correct	12 ms	12024 KB	Output is correct
35	Correct	12 ms	12024 KB	Output is correct
36	Correct	12 ms	12024 KB	Output is correct
37	Correct	12 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	12 ms	12024 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	12 ms	12024 KB	Output is correct
42	Correct	12 ms	12024 KB	Output is correct
43	Correct	12 ms	12152 KB	Output is correct
44	Correct	12 ms	12024 KB	Output is correct
45	Correct	12 ms	12024 KB	Output is correct
46	Correct	13 ms	12152 KB	Output is correct
47	Correct	12 ms	12024 KB	Output is correct
48	Correct	12 ms	12024 KB	Output is correct
49	Correct	12 ms	12152 KB	Output is correct
50	Correct	13 ms	12024 KB	Output is correct
51	Correct	13 ms	12024 KB	Output is correct
52	Correct	12 ms	12024 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	12 ms	12028 KB	Output is correct
55	Correct	12 ms	12024 KB	Output is correct
56	Correct	12 ms	12024 KB	Output is correct
57	Correct	13 ms	12024 KB	Output is correct
58	Correct	13 ms	12152 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	12 ms	12024 KB	Output is correct
2	Correct	12 ms	12028 KB	Output is correct
3	Correct	12 ms	12024 KB	Output is correct
4	Correct	12 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	12 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	12 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	13 ms	12024 KB	Output is correct
16	Correct	12 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	12 ms	12024 KB	Output is correct
21	Correct	12 ms	12024 KB	Output is correct
22	Correct	13 ms	12152 KB	Output is correct
23	Correct	13 ms	12152 KB	Output is correct
24	Correct	13 ms	12152 KB	Output is correct
25	Correct	13 ms	12152 KB	Output is correct
26	Correct	13 ms	12152 KB	Output is correct
27	Correct	14 ms	12152 KB	Output is correct
28	Correct	13 ms	12152 KB	Output is correct
29	Correct	13 ms	12156 KB	Output is correct
30	Correct	12 ms	12024 KB	Output is correct
31	Correct	13 ms	12152 KB	Output is correct
32	Correct	12 ms	12024 KB	Output is correct
33	Correct	12 ms	12024 KB	Output is correct
34	Correct	12 ms	12024 KB	Output is correct
35	Correct	12 ms	12024 KB	Output is correct
36	Correct	12 ms	12024 KB	Output is correct
37	Correct	12 ms	12024 KB	Output is correct
38	Correct	13 ms	12152 KB	Output is correct
39	Correct	12 ms	12024 KB	Output is correct
40	Correct	12 ms	12024 KB	Output is correct
41	Correct	12 ms	12024 KB	Output is correct
42	Correct	12 ms	12024 KB	Output is correct
43	Correct	12 ms	12152 KB	Output is correct
44	Correct	12 ms	12024 KB	Output is correct
45	Correct	12 ms	12024 KB	Output is correct
46	Correct	13 ms	12152 KB	Output is correct
47	Correct	12 ms	12024 KB	Output is correct
48	Correct	12 ms	12024 KB	Output is correct
49	Correct	12 ms	12152 KB	Output is correct
50	Correct	13 ms	12024 KB	Output is correct
51	Correct	13 ms	12024 KB	Output is correct
52	Correct	12 ms	12024 KB	Output is correct
53	Correct	13 ms	12152 KB	Output is correct
54	Correct	12 ms	12028 KB	Output is correct
55	Correct	12 ms	12024 KB	Output is correct
56	Correct	12 ms	12024 KB	Output is correct
57	Correct	13 ms	12024 KB	Output is correct
58	Correct	13 ms	12152 KB	Output is correct
59	Correct	422 ms	36108 KB	Output is correct
60	Correct	511 ms	38760 KB	Output is correct
61	Correct	12 ms	12024 KB	Output is correct
62	Correct	12 ms	12024 KB	Output is correct
63	Correct	363 ms	33640 KB	Output is correct
64	Correct	14 ms	12408 KB	Output is correct
65	Correct	24 ms	13944 KB	Output is correct
66	Correct	170 ms	27896 KB	Output is correct
67	Correct	559 ms	46972 KB	Output is correct
68	Correct	580 ms	47732 KB	Output is correct
69	Correct	20 ms	12920 KB	Output is correct
70	Correct	110 ms	21224 KB	Output is correct
71	Correct	369 ms	41912 KB	Output is correct
72	Correct	368 ms	40672 KB	Output is correct
73	Correct	116 ms	19052 KB	Output is correct
74	Correct	509 ms	37740 KB	Output is correct
75	Correct	40 ms	15224 KB	Output is correct
76	Correct	354 ms	41556 KB	Output is correct
77	Correct	355 ms	41640 KB	Output is correct
78	Correct	41 ms	15352 KB	Output is correct
79	Correct	567 ms	45176 KB	Output is correct
80	Correct	17 ms	12280 KB	Output is correct
81	Correct	133 ms	21360 KB	Output is correct
82	Correct	438 ms	39524 KB	Output is correct
83	Correct	511 ms	37744 KB	Output is correct
84	Correct	517 ms	37732 KB	Output is correct
85	Correct	513 ms	37744 KB	Output is correct
86	Correct	534 ms	38756 KB	Output is correct
87	Correct	512 ms	38848 KB	Output is correct

답안 #209546

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