Submission #151230

#	Time	Username	Problem	Language	Result	Execution time	Memory
151230		cfalas	Network (BOI15_net)	C++14	0 / 100	2 ms	380 KiB

net

#include<bits/stdc++.h>
using namespace std;
 
int main(){
	int n;
	vector<int> ans;
	cin>>n;
	int a[n+1] = {};
	for(int i=0;i<=n;i++) a[i]=0;
	for(int i=0;i<n-1;i++){
		int b, c;
		cin>>b>>c;
		a[b]++;
		a[c]++;
	}
	for(int i=1;i<=n;i++){
		if(a[i]<2) ans.push_back(i);
	}
	cout<<(ans.size()+1)/2<<endl;
	for(int i=0;i<(ans.size()+1)/2;i++){
		cout<<ans[i]<<" "<<ans[(i+(ans.size()+1)/2)%ans.size()]<<endl;
	}
 
}

Compilation message (stderr)

net.cpp: In function 'int main()':
net.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(ans.size()+1)/2;i++){
              ~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 18
• Subtask 2: 0 / 45
• Subtask 3: 0 / 37