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답안 #106891

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
106891 2019-04-20T20:27:50 Z Pajaraja Network (BOI15_net) C++17
100 / 100
 735 ms 47688 KB 
#include <bits/stdc++.h>
using namespace std;
vector<int> g[500007];
int k[500007],cnt;
void dfs(int s,int f)
{
    if(g[s].size()==1) {k[cnt++]=s; return;}
    for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s);
}
int main()
{
    int n,v1,v2,l=0;
    scanf("%d",&n);
    for(int i=0;i<n-1;i++)
    {
        scanf("%d%d",&v1,&v2);
        g[v1].push_back(v2);
        g[v2].push_back(v1);
    }
    for(int i=1;i<=n;i++) if(g[i].size()==1) l++;
    printf("%d\n",(l+1)/2);
    for(int i=1;i<=n;i++) if(g[i].size()>1)
    {
        dfs(i,0);
      	for(int j=0;j<l/2;j++) printf("%d %d\n",k[j],k[j+(l+1)/2]);
      	if(l%2==1) printf("%d %d",i,k[l/2]);
        return 0;
    }
}

Compilation message

net.cpp: In function 'void dfs(int, int)':
net.cpp:8:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<g[s].size();i++) if(g[s][i]!=f) dfs(g[s][i],s);
                 ~^~~~~~~~~~~~
net.cpp: In function 'int main()':
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:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&v1,&v2);
         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 13 ms 12032 KB Output is correct
6 Correct 15 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12004 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 15 ms 12032 KB Output is correct
12 Correct 14 ms 12160 KB Output is correct
13 Correct 14 ms 12160 KB Output is correct
14 Correct 14 ms 12032 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 16 ms 12032 KB Output is correct
17 Correct 12 ms 12032 KB Output is correct
18 Correct 13 ms 12032 KB Output is correct
19 Correct 12 ms 12004 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct

Subtask #2
45.0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 13 ms 12032 KB Output is correct
6 Correct 15 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12004 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 15 ms 12032 KB Output is correct
12 Correct 14 ms 12160 KB Output is correct
13 Correct 14 ms 12160 KB Output is correct
14 Correct 14 ms 12032 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 16 ms 12032 KB Output is correct
17 Correct 12 ms 12032 KB Output is correct
18 Correct 13 ms 12032 KB Output is correct
19 Correct 12 ms 12004 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 14 ms 12156 KB Output is correct
23 Correct 14 ms 12160 KB Output is correct
24 Correct 13 ms 12288 KB Output is correct
25 Correct 14 ms 12160 KB Output is correct
26 Correct 13 ms 12160 KB Output is correct
27 Correct 14 ms 12160 KB Output is correct
28 Correct 14 ms 12160 KB Output is correct
29 Correct 15 ms 12152 KB Output is correct
30 Correct 15 ms 12032 KB Output is correct
31 Correct 14 ms 12160 KB Output is correct
32 Correct 14 ms 12032 KB Output is correct
33 Correct 13 ms 12032 KB Output is correct
34 Correct 13 ms 12032 KB Output is correct
35 Correct 13 ms 12032 KB Output is correct
36 Correct 13 ms 12160 KB Output is correct
37 Correct 14 ms 12160 KB Output is correct
38 Correct 13 ms 12160 KB Output is correct
39 Correct 15 ms 12032 KB Output is correct
40 Correct 12 ms 12032 KB Output is correct
41 Correct 13 ms 12032 KB Output is correct
42 Correct 14 ms 12160 KB Output is correct
43 Correct 13 ms 12160 KB Output is correct
44 Correct 14 ms 12032 KB Output is correct
45 Correct 14 ms 12160 KB Output is correct
46 Correct 14 ms 12152 KB Output is correct
47 Correct 13 ms 12160 KB Output is correct
48 Correct 12 ms 12152 KB Output is correct
49 Correct 14 ms 12160 KB Output is correct
50 Correct 12 ms 12032 KB Output is correct
51 Correct 13 ms 12032 KB Output is correct
52 Correct 13 ms 12152 KB Output is correct
53 Correct 13 ms 12160 KB Output is correct
54 Correct 12 ms 12032 KB Output is correct
55 Correct 15 ms 12024 KB Output is correct
56 Correct 14 ms 12032 KB Output is correct
57 Correct 13 ms 12032 KB Output is correct
58 Correct 15 ms 12160 KB Output is correct

Subtask #3
37.0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 12032 KB Output is correct
2 Correct 12 ms 12032 KB Output is correct
3 Correct 11 ms 12032 KB Output is correct
4 Correct 11 ms 12032 KB Output is correct
5 Correct 13 ms 12032 KB Output is correct
6 Correct 15 ms 12032 KB Output is correct
7 Correct 12 ms 12032 KB Output is correct
8 Correct 16 ms 12160 KB Output is correct
9 Correct 13 ms 12004 KB Output is correct
10 Correct 14 ms 12160 KB Output is correct
11 Correct 15 ms 12032 KB Output is correct
12 Correct 14 ms 12160 KB Output is correct
13 Correct 14 ms 12160 KB Output is correct
14 Correct 14 ms 12032 KB Output is correct
15 Correct 14 ms 12160 KB Output is correct
16 Correct 16 ms 12032 KB Output is correct
17 Correct 12 ms 12032 KB Output is correct
18 Correct 13 ms 12032 KB Output is correct
19 Correct 12 ms 12004 KB Output is correct
20 Correct 12 ms 12032 KB Output is correct
21 Correct 13 ms 12032 KB Output is correct
22 Correct 14 ms 12156 KB Output is correct
23 Correct 14 ms 12160 KB Output is correct
24 Correct 13 ms 12288 KB Output is correct
25 Correct 14 ms 12160 KB Output is correct
26 Correct 13 ms 12160 KB Output is correct
27 Correct 14 ms 12160 KB Output is correct
28 Correct 14 ms 12160 KB Output is correct
29 Correct 15 ms 12152 KB Output is correct
30 Correct 15 ms 12032 KB Output is correct
31 Correct 14 ms 12160 KB Output is correct
32 Correct 14 ms 12032 KB Output is correct
33 Correct 13 ms 12032 KB Output is correct
34 Correct 13 ms 12032 KB Output is correct
35 Correct 13 ms 12032 KB Output is correct
36 Correct 13 ms 12160 KB Output is correct
37 Correct 14 ms 12160 KB Output is correct
38 Correct 13 ms 12160 KB Output is correct
39 Correct 15 ms 12032 KB Output is correct
40 Correct 12 ms 12032 KB Output is correct
41 Correct 13 ms 12032 KB Output is correct
42 Correct 14 ms 12160 KB Output is correct
43 Correct 13 ms 12160 KB Output is correct
44 Correct 14 ms 12032 KB Output is correct
45 Correct 14 ms 12160 KB Output is correct
46 Correct 14 ms 12152 KB Output is correct
47 Correct 13 ms 12160 KB Output is correct
48 Correct 12 ms 12152 KB Output is correct
49 Correct 14 ms 12160 KB Output is correct
50 Correct 12 ms 12032 KB Output is correct
51 Correct 13 ms 12032 KB Output is correct
52 Correct 13 ms 12152 KB Output is correct
53 Correct 13 ms 12160 KB Output is correct
54 Correct 12 ms 12032 KB Output is correct
55 Correct 15 ms 12024 KB Output is correct
56 Correct 14 ms 12032 KB Output is correct
57 Correct 13 ms 12032 KB Output is correct
58 Correct 15 ms 12160 KB Output is correct
59 Correct 541 ms 35952 KB Output is correct
60 Correct 580 ms 38584 KB Output is correct
61 Correct 11 ms 12032 KB Output is correct
62 Correct 13 ms 12060 KB Output is correct
63 Correct 534 ms 33416 KB Output is correct
64 Correct 20 ms 12672 KB Output is correct
65 Correct 27 ms 14044 KB Output is correct
66 Correct 213 ms 27896 KB Output is correct
67 Correct 646 ms 47096 KB Output is correct
68 Correct 735 ms 47688 KB Output is correct
69 Correct 19 ms 12976 KB Output is correct
70 Correct 137 ms 21148 KB Output is correct
71 Correct 396 ms 41716 KB Output is correct
72 Correct 374 ms 40596 KB Output is correct
73 Correct 181 ms 19044 KB Output is correct
74 Correct 562 ms 37496 KB Output is correct
75 Correct 51 ms 15100 KB Output is correct
76 Correct 358 ms 41412 KB Output is correct
77 Correct 367 ms 41392 KB Output is correct
78 Correct 59 ms 15480 KB Output is correct
79 Correct 629 ms 45180 KB Output is correct
80 Correct 15 ms 12288 KB Output is correct
81 Correct 140 ms 21232 KB Output is correct
82 Correct 531 ms 39388 KB Output is correct
83 Correct 538 ms 37624 KB Output is correct
84 Correct 569 ms 37800 KB Output is correct
85 Correct 544 ms 37552 KB Output is correct
86 Correct 499 ms 38736 KB Output is correct
87 Correct 574 ms 38776 KB Output is correct