oj.uz

Submission #23207

# Submission time Handle Problem Language Result Execution time Memory
23207 2017-05-04T13:45:09 Z iletavcioski Network (BOI15_net) C++14
100 / 100
 659 ms 42516 KB 
#include<iostream>
#include<vector>
#include<cstdio>
using namespace std;
vector<vector<int> > v;
int brojac=0;
vector<int> toc;
void dfs(int x,int prev)
{
	
	for(int i=0;i<v[x].size();i++)
		if(v[x][i]!=prev)
		dfs(v[x][i],x);
	if(v[x].size()==1)
		toc.push_back(x);
}
int main()
{
	int n;
	cin>>n;
	vector<int> vec;
	v.insert(v.begin(),n+1,vec);
	if(n==1)
	{
		cout<<0<<endl;
		return 0;
	}
	for(int i=0;i<n-1;i++)
	{
		int a,b;
		scanf("%d %d",&a,&b);
		a--;
		b--;
		v[a].push_back(b);
		v[b].push_back(a);
	}
	brojac=0;
	for(int i=0;i<n;i++)
	{
		if(v[i].size()>1){
			dfs(i,-1);
		break;}
	}
	printf("%d\n",(toc.size()+1)/2);
	for(int i=0;i<(toc.size()+1)/2;i++)
	{
		printf("%d %d\n",toc[i]+1,toc[i+(toc.size())/2]+1);
	}
	return 0;
}

Compilation message

net.cpp: In function 'void dfs(int, int)':
net.cpp:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<v[x].size();i++)
               ^
net.cpp: In function 'int main()':
net.cpp:44:32: 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",(toc.size()+1)/2);
                                ^
net.cpp:45:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(toc.size()+1)/2;i++)
               ^
net.cpp:31:23: 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

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Correct 0 ms 2024 KB Output is correct
3 Correct 0 ms 2024 KB Output is correct
4 Correct 0 ms 2024 KB Output is correct
5 Correct 0 ms 2024 KB Output is correct
6 Correct 0 ms 2024 KB Output is correct
7 Correct 0 ms 2024 KB Output is correct
8 Correct 0 ms 2024 KB Output is correct
9 Correct 0 ms 2024 KB Output is correct
10 Correct 0 ms 2024 KB Output is correct
11 Correct 0 ms 2024 KB Output is correct
12 Correct 0 ms 2024 KB Output is correct
13 Correct 0 ms 2024 KB Output is correct
14 Correct 0 ms 2024 KB Output is correct
15 Correct 0 ms 2024 KB Output is correct
16 Correct 0 ms 2024 KB Output is correct
17 Correct 0 ms 2024 KB Output is correct
18 Correct 0 ms 2024 KB Output is correct
19 Correct 0 ms 2024 KB Output is correct
20 Correct 0 ms 2024 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Correct 0 ms 2024 KB Output is correct
3 Correct 0 ms 2024 KB Output is correct
4 Correct 0 ms 2024 KB Output is correct
5 Correct 0 ms 2024 KB Output is correct
6 Correct 0 ms 2024 KB Output is correct
7 Correct 0 ms 2024 KB Output is correct
8 Correct 0 ms 2024 KB Output is correct
9 Correct 0 ms 2024 KB Output is correct
10 Correct 0 ms 2024 KB Output is correct
11 Correct 0 ms 2024 KB Output is correct
12 Correct 0 ms 2024 KB Output is correct
13 Correct 0 ms 2024 KB Output is correct
14 Correct 0 ms 2024 KB Output is correct
15 Correct 0 ms 2024 KB Output is correct
16 Correct 0 ms 2024 KB Output is correct
17 Correct 0 ms 2024 KB Output is correct
18 Correct 0 ms 2024 KB Output is correct
19 Correct 0 ms 2024 KB Output is correct
20 Correct 0 ms 2024 KB Output is correct
21 Correct 0 ms 2024 KB Output is correct
22 Correct 0 ms 2156 KB Output is correct
23 Correct 0 ms 2156 KB Output is correct
24 Correct 0 ms 2156 KB Output is correct
25 Correct 0 ms 2156 KB Output is correct
26 Correct 0 ms 2156 KB Output is correct
27 Correct 0 ms 2156 KB Output is correct
28 Correct 0 ms 2156 KB Output is correct
29 Correct 0 ms 2156 KB Output is correct
30 Correct 0 ms 2024 KB Output is correct
31 Correct 0 ms 2156 KB Output is correct
32 Correct 0 ms 2024 KB Output is correct
33 Correct 0 ms 2024 KB Output is correct
34 Correct 0 ms 2024 KB Output is correct
35 Correct 0 ms 2024 KB Output is correct
36 Correct 0 ms 2024 KB Output is correct
37 Correct 0 ms 2024 KB Output is correct
38 Correct 0 ms 2156 KB Output is correct
39 Correct 0 ms 2024 KB Output is correct
40 Correct 0 ms 2024 KB Output is correct
41 Correct 0 ms 2024 KB Output is correct
42 Correct 0 ms 2024 KB Output is correct
43 Correct 0 ms 2156 KB Output is correct
44 Correct 0 ms 2024 KB Output is correct
45 Correct 0 ms 2024 KB Output is correct
46 Correct 0 ms 2156 KB Output is correct
47 Correct 0 ms 2024 KB Output is correct
48 Correct 0 ms 2024 KB Output is correct
49 Correct 0 ms 2156 KB Output is correct
50 Correct 0 ms 2024 KB Output is correct
51 Correct 0 ms 2024 KB Output is correct
52 Correct 0 ms 2024 KB Output is correct
53 Correct 0 ms 2156 KB Output is correct
54 Correct 0 ms 2024 KB Output is correct
55 Correct 0 ms 2024 KB Output is correct
56 Correct 0 ms 2024 KB Output is correct
57 Correct 0 ms 2024 KB Output is correct
58 Correct 0 ms 2156 KB Output is correct

Subtask #3
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Correct 0 ms 2024 KB Output is correct
3 Correct 0 ms 2024 KB Output is correct
4 Correct 0 ms 2024 KB Output is correct
5 Correct 0 ms 2024 KB Output is correct
6 Correct 0 ms 2024 KB Output is correct
7 Correct 0 ms 2024 KB Output is correct
8 Correct 0 ms 2024 KB Output is correct
9 Correct 0 ms 2024 KB Output is correct
10 Correct 0 ms 2024 KB Output is correct
11 Correct 0 ms 2024 KB Output is correct
12 Correct 0 ms 2024 KB Output is correct
13 Correct 0 ms 2024 KB Output is correct
14 Correct 0 ms 2024 KB Output is correct
15 Correct 0 ms 2024 KB Output is correct
16 Correct 0 ms 2024 KB Output is correct
17 Correct 0 ms 2024 KB Output is correct
18 Correct 0 ms 2024 KB Output is correct
19 Correct 0 ms 2024 KB Output is correct
20 Correct 0 ms 2024 KB Output is correct
21 Correct 0 ms 2024 KB Output is correct
22 Correct 0 ms 2156 KB Output is correct
23 Correct 0 ms 2156 KB Output is correct
24 Correct 0 ms 2156 KB Output is correct
25 Correct 0 ms 2156 KB Output is correct
26 Correct 0 ms 2156 KB Output is correct
27 Correct 0 ms 2156 KB Output is correct
28 Correct 0 ms 2156 KB Output is correct
29 Correct 0 ms 2156 KB Output is correct
30 Correct 0 ms 2024 KB Output is correct
31 Correct 0 ms 2156 KB Output is correct
32 Correct 0 ms 2024 KB Output is correct
33 Correct 0 ms 2024 KB Output is correct
34 Correct 0 ms 2024 KB Output is correct
35 Correct 0 ms 2024 KB Output is correct
36 Correct 0 ms 2024 KB Output is correct
37 Correct 0 ms 2024 KB Output is correct
38 Correct 0 ms 2156 KB Output is correct
39 Correct 0 ms 2024 KB Output is correct
40 Correct 0 ms 2024 KB Output is correct
41 Correct 0 ms 2024 KB Output is correct
42 Correct 0 ms 2024 KB Output is correct
43 Correct 0 ms 2156 KB Output is correct
44 Correct 0 ms 2024 KB Output is correct
45 Correct 0 ms 2024 KB Output is correct
46 Correct 0 ms 2156 KB Output is correct
47 Correct 0 ms 2024 KB Output is correct
48 Correct 0 ms 2024 KB Output is correct
49 Correct 0 ms 2156 KB Output is correct
50 Correct 0 ms 2024 KB Output is correct
51 Correct 0 ms 2024 KB Output is correct
52 Correct 0 ms 2024 KB Output is correct
53 Correct 0 ms 2156 KB Output is correct
54 Correct 0 ms 2024 KB Output is correct
55 Correct 0 ms 2024 KB Output is correct
56 Correct 0 ms 2024 KB Output is correct
57 Correct 0 ms 2024 KB Output is correct
58 Correct 0 ms 2156 KB Output is correct
59 Correct 419 ms 30820 KB Output is correct
60 Correct 579 ms 33256 KB Output is correct
61 Correct 0 ms 2024 KB Output is correct
62 Correct 0 ms 2024 KB Output is correct
63 Correct 399 ms 27572 KB Output is correct
64 Correct 0 ms 2452 KB Output is correct
65 Correct 13 ms 4108 KB Output is correct
66 Correct 193 ms 19764 KB Output is correct
67 Correct 659 ms 41760 KB Output is correct
68 Correct 656 ms 42516 KB Output is correct
69 Correct 6 ms 3112 KB Output is correct
70 Correct 103 ms 13932 KB Output is correct
71 Correct 379 ms 35596 KB Output is correct
72 Correct 379 ms 35596 KB Output is correct
73 Correct 116 ms 10644 KB Output is correct
74 Correct 579 ms 31540 KB Output is correct
75 Correct 26 ms 5792 KB Output is correct
76 Correct 403 ms 34580 KB Output is correct
77 Correct 373 ms 34580 KB Output is correct
78 Correct 39 ms 6000 KB Output is correct
79 Correct 636 ms 40016 KB Output is correct
80 Correct 0 ms 2332 KB Output is correct
81 Correct 129 ms 13040 KB Output is correct
82 Correct 493 ms 33824 KB Output is correct
83 Correct 546 ms 31540 KB Output is correct
84 Correct 566 ms 31540 KB Output is correct
85 Correct 546 ms 31540 KB Output is correct
86 Correct 399 ms 33260 KB Output is correct
87 Correct 623 ms 33260 KB Output is correct