답안 #100600

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
100600	2019-03-12T16:18:20 Z	MohamedAhmed0	Network (BOI15_net)	C++14	100 / 100	742 ms	47932 KB

#include <bits/stdc++.h>

using namespace std;

const int MAX = 500005 ;
int n ;

vector< vector<int> >adj(MAX) ;
stack<int>s ;
vector<int>v ;

void dfs(int node , int par)
{
    if(adj[node].size() == 1)
        v.push_back(node) ;
    for(auto &child : adj[node])
    {
        if(child == par)
            continue;
        dfs(child , node) ;
    }
}


int main()
{
    scanf("%d" , &n) ;
    for(int i = 0 ; i < n-1 ; ++i)
    {
        int x , y ;
        scanf("%d %d" , &x , &y) ;
        adj[x].push_back(y) ;
        adj[y].push_back(x) ;
    }
    int leaves = 0 ;
    for(int i = 1 ; i <= n ; ++i)
    {
        if(adj[i].size() == 1)
            leaves++;
    }
    int start = -1 ;
    for(int i = 1 ; i <= n ; ++i)
    {
        if(adj[i].size() > 1)
        {
            start = i ;
            dfs(start , -1) ;
            break;
        }
    }
    int edges = (leaves + 1) / 2 ;
    cout<<edges<<"\n";
    if(leaves & 1)
    {
        cout<<v[edges-1]<<" "<<start<<"\n";
    }
    for(int i = 0 ; v.size()/2 ; ++i)
    {
        if(i + edges >= v.size())
            break;
        cout<<v[i]<<" "<<v[i+edges]<<"\n";
    }
    return 0 ;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(i + edges >= v.size())
            ~~~~~~~~~~^~~~~~~~~~~
net.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d" , &n) ;
     ~~~~~^~~~~~~~~~~
net.cpp:31:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d" , &x , &y) ;
         ~~~~~^~~~~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

#	결과	실행 시간	메모리	Grader output
1	Correct	16 ms	12160 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	16 ms	12032 KB	Output is correct
5	Correct	14 ms	12032 KB	Output is correct
6	Correct	14 ms	12032 KB	Output is correct
7	Correct	14 ms	12032 KB	Output is correct
8	Correct	14 ms	12032 KB	Output is correct
9	Correct	15 ms	12188 KB	Output is correct
10	Correct	16 ms	12032 KB	Output is correct
11	Correct	15 ms	12032 KB	Output is correct
12	Correct	39 ms	12024 KB	Output is correct
13	Correct	14 ms	12160 KB	Output is correct
14	Correct	14 ms	12132 KB	Output is correct
15	Correct	13 ms	12096 KB	Output is correct
16	Correct	15 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	14 ms	12160 KB	Output is correct

Subtask #2
45.0 / 45.0

#	결과	실행 시간	메모리	Grader output
1	Correct	16 ms	12160 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	16 ms	12032 KB	Output is correct
5	Correct	14 ms	12032 KB	Output is correct
6	Correct	14 ms	12032 KB	Output is correct
7	Correct	14 ms	12032 KB	Output is correct
8	Correct	14 ms	12032 KB	Output is correct
9	Correct	15 ms	12188 KB	Output is correct
10	Correct	16 ms	12032 KB	Output is correct
11	Correct	15 ms	12032 KB	Output is correct
12	Correct	39 ms	12024 KB	Output is correct
13	Correct	14 ms	12160 KB	Output is correct
14	Correct	14 ms	12132 KB	Output is correct
15	Correct	13 ms	12096 KB	Output is correct
16	Correct	15 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	14 ms	12160 KB	Output is correct
21	Correct	14 ms	12032 KB	Output is correct
22	Correct	17 ms	12160 KB	Output is correct
23	Correct	15 ms	12160 KB	Output is correct
24	Correct	16 ms	12260 KB	Output is correct
25	Correct	16 ms	12160 KB	Output is correct
26	Correct	16 ms	12152 KB	Output is correct
27	Correct	16 ms	12132 KB	Output is correct
28	Correct	23 ms	12160 KB	Output is correct
29	Correct	15 ms	12160 KB	Output is correct
30	Correct	16 ms	12160 KB	Output is correct
31	Correct	18 ms	12160 KB	Output is correct
32	Correct	15 ms	12160 KB	Output is correct
33	Correct	15 ms	12160 KB	Output is correct
34	Correct	14 ms	12032 KB	Output is correct
35	Correct	14 ms	12032 KB	Output is correct
36	Correct	14 ms	12160 KB	Output is correct
37	Correct	14 ms	12160 KB	Output is correct
38	Correct	14 ms	12160 KB	Output is correct
39	Correct	35 ms	12160 KB	Output is correct
40	Correct	15 ms	12160 KB	Output is correct
41	Correct	15 ms	12160 KB	Output is correct
42	Correct	16 ms	12160 KB	Output is correct
43	Correct	15 ms	12160 KB	Output is correct
44	Correct	14 ms	12032 KB	Output is correct
45	Correct	14 ms	12032 KB	Output is correct
46	Correct	15 ms	12160 KB	Output is correct
47	Correct	13 ms	12160 KB	Output is correct
48	Correct	14 ms	12160 KB	Output is correct
49	Correct	15 ms	12160 KB	Output is correct
50	Correct	13 ms	12160 KB	Output is correct
51	Correct	14 ms	12160 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	15 ms	12132 KB	Output is correct
54	Correct	14 ms	12032 KB	Output is correct
55	Correct	16 ms	12032 KB	Output is correct
56	Correct	14 ms	12160 KB	Output is correct
57	Correct	14 ms	12160 KB	Output is correct
58	Correct	17 ms	12160 KB	Output is correct

Subtask #3
37.0 / 37.0

#	결과	실행 시간	메모리	Grader output
1	Correct	16 ms	12160 KB	Output is correct
2	Correct	14 ms	12032 KB	Output is correct
3	Correct	14 ms	12032 KB	Output is correct
4	Correct	16 ms	12032 KB	Output is correct
5	Correct	14 ms	12032 KB	Output is correct
6	Correct	14 ms	12032 KB	Output is correct
7	Correct	14 ms	12032 KB	Output is correct
8	Correct	14 ms	12032 KB	Output is correct
9	Correct	15 ms	12188 KB	Output is correct
10	Correct	16 ms	12032 KB	Output is correct
11	Correct	15 ms	12032 KB	Output is correct
12	Correct	39 ms	12024 KB	Output is correct
13	Correct	14 ms	12160 KB	Output is correct
14	Correct	14 ms	12132 KB	Output is correct
15	Correct	13 ms	12096 KB	Output is correct
16	Correct	15 ms	12032 KB	Output is correct
17	Correct	13 ms	12032 KB	Output is correct
18	Correct	13 ms	12032 KB	Output is correct
19	Correct	15 ms	12032 KB	Output is correct
20	Correct	14 ms	12160 KB	Output is correct
21	Correct	14 ms	12032 KB	Output is correct
22	Correct	17 ms	12160 KB	Output is correct
23	Correct	15 ms	12160 KB	Output is correct
24	Correct	16 ms	12260 KB	Output is correct
25	Correct	16 ms	12160 KB	Output is correct
26	Correct	16 ms	12152 KB	Output is correct
27	Correct	16 ms	12132 KB	Output is correct
28	Correct	23 ms	12160 KB	Output is correct
29	Correct	15 ms	12160 KB	Output is correct
30	Correct	16 ms	12160 KB	Output is correct
31	Correct	18 ms	12160 KB	Output is correct
32	Correct	15 ms	12160 KB	Output is correct
33	Correct	15 ms	12160 KB	Output is correct
34	Correct	14 ms	12032 KB	Output is correct
35	Correct	14 ms	12032 KB	Output is correct
36	Correct	14 ms	12160 KB	Output is correct
37	Correct	14 ms	12160 KB	Output is correct
38	Correct	14 ms	12160 KB	Output is correct
39	Correct	35 ms	12160 KB	Output is correct
40	Correct	15 ms	12160 KB	Output is correct
41	Correct	15 ms	12160 KB	Output is correct
42	Correct	16 ms	12160 KB	Output is correct
43	Correct	15 ms	12160 KB	Output is correct
44	Correct	14 ms	12032 KB	Output is correct
45	Correct	14 ms	12032 KB	Output is correct
46	Correct	15 ms	12160 KB	Output is correct
47	Correct	13 ms	12160 KB	Output is correct
48	Correct	14 ms	12160 KB	Output is correct
49	Correct	15 ms	12160 KB	Output is correct
50	Correct	13 ms	12160 KB	Output is correct
51	Correct	14 ms	12160 KB	Output is correct
52	Correct	13 ms	12032 KB	Output is correct
53	Correct	15 ms	12132 KB	Output is correct
54	Correct	14 ms	12032 KB	Output is correct
55	Correct	16 ms	12032 KB	Output is correct
56	Correct	14 ms	12160 KB	Output is correct
57	Correct	14 ms	12160 KB	Output is correct
58	Correct	17 ms	12160 KB	Output is correct
59	Correct	455 ms	36072 KB	Output is correct
60	Correct	571 ms	38760 KB	Output is correct
61	Correct	15 ms	12160 KB	Output is correct
62	Correct	14 ms	12132 KB	Output is correct
63	Correct	454 ms	33608 KB	Output is correct
64	Correct	17 ms	12544 KB	Output is correct
65	Correct	30 ms	13928 KB	Output is correct
66	Correct	245 ms	28024 KB	Output is correct
67	Correct	710 ms	47080 KB	Output is correct
68	Correct	742 ms	47932 KB	Output is correct
69	Correct	20 ms	12928 KB	Output is correct
70	Correct	151 ms	21200 KB	Output is correct
71	Correct	476 ms	41824 KB	Output is correct
72	Correct	394 ms	40660 KB	Output is correct
73	Correct	149 ms	19056 KB	Output is correct
74	Correct	625 ms	37760 KB	Output is correct
75	Correct	51 ms	15224 KB	Output is correct
76	Correct	493 ms	41556 KB	Output is correct
77	Correct	468 ms	41812 KB	Output is correct
78	Correct	74 ms	15608 KB	Output is correct
79	Correct	644 ms	45356 KB	Output is correct
80	Correct	15 ms	12288 KB	Output is correct
81	Correct	170 ms	21320 KB	Output is correct
82	Correct	526 ms	39656 KB	Output is correct
83	Correct	615 ms	37748 KB	Output is correct
84	Correct	525 ms	37820 KB	Output is correct
85	Correct	568 ms	37940 KB	Output is correct
86	Correct	690 ms	39016 KB	Output is correct
87	Correct	613 ms	38888 KB	Output is correct

답안 #100600

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