oj.uz

답안 #23203

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
23203 2017-05-04T13:27:14 Z iletavcioski Network (BOI15_net) C++14
0 / 100
 0 ms 2024 KB 
#include<iostream>
#include<vector>
using namespace std;
vector<vector<int> > v;
int brojac=0;
vector<int> toc;
void dfs(int x,int prev)
{
	if(v[x].size()==1)
		toc.push_back(x);
	for(int i=0;i<v[x].size();i++)
		if(v[x][i]!=prev)
		dfs(v[x][i],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;
		cin>>a>>b;
		a--;
		b--;
		v[a].push_back(b);
		v[b].push_back(a);
	}
	brojac=0;
	dfs(0,-1);
	if(toc.size()%2)
	{
		for(int i=0;i<n;i++)
		{
			if(v[i].size()>1){
				toc.push_back(i);
			break;}

		}
	}
	cout<<(int)(toc.size())/2<<endl;
	for(int i=0;i<toc.size()-1;i+=2)
	{
		cout<<toc[i]+1<<" "<<toc[i+1]+1<<endl;
	}
	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:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<toc.size()-1;i+=2)
               ^

Subtask #1
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Incorrect 0 ms 2024 KB Breaking single line is causing network to disconnect.
3 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Incorrect 0 ms 2024 KB Breaking single line is causing network to disconnect.
3 Halted 0 ms 0 KB -

Subtask #3
0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 2024 KB Output is correct
2 Incorrect 0 ms 2024 KB Breaking single line is causing network to disconnect.
3 Halted 0 ms 0 KB -