Submission #151206

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
151206	2019-09-02T07:55:10 Z	cfalas	Network (BOI15_net)	C++14	0 / 100	2 ms	380 KB

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();i+=2){
		if(i<ans.size()-1) cout<<ans[i]<<" "<<ans[i+1]<<endl;
		else cout<<ans[0]<<" "<<ans[i]<<endl;
	}

}

Compilation message

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();i+=2){
              ~^~~~~~~~~~~
net.cpp:21:7: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(i<ans.size()-1) cout<<ans[i]<<" "<<ans[i+1]<<endl;
      ~^~~~~~~~~~~~~

Subtask #1

0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	256 KB	Output is correct
2	Correct	2 ms	256 KB	Output is correct
3	Correct	2 ms	376 KB	Output is correct
4	Correct	2 ms	256 KB	Output is correct
5	Correct	2 ms	380 KB	Output is correct
6	Correct	2 ms	376 KB	Output is correct
7	Correct	2 ms	256 KB	Output is correct
8	Correct	2 ms	376 KB	Output is correct
9	Correct	2 ms	256 KB	Output is correct
10	Incorrect	2 ms	256 KB	Breaking single line is causing network to disconnect.
11	Halted	0 ms	0 KB	-

Subtask #2

0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	256 KB	Output is correct
2	Correct	2 ms	256 KB	Output is correct
3	Correct	2 ms	376 KB	Output is correct
4	Correct	2 ms	256 KB	Output is correct
5	Correct	2 ms	380 KB	Output is correct
6	Correct	2 ms	376 KB	Output is correct
7	Correct	2 ms	256 KB	Output is correct
8	Correct	2 ms	376 KB	Output is correct
9	Correct	2 ms	256 KB	Output is correct
10	Incorrect	2 ms	256 KB	Breaking single line is causing network to disconnect.
11	Halted	0 ms	0 KB	-

Subtask #3

0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	2 ms	256 KB	Output is correct
2	Correct	2 ms	256 KB	Output is correct
3	Correct	2 ms	376 KB	Output is correct
4	Correct	2 ms	256 KB	Output is correct
5	Correct	2 ms	380 KB	Output is correct
6	Correct	2 ms	376 KB	Output is correct
7	Correct	2 ms	256 KB	Output is correct
8	Correct	2 ms	376 KB	Output is correct
9	Correct	2 ms	256 KB	Output is correct
10	Incorrect	2 ms	256 KB	Breaking single line is causing network to disconnect.
11	Halted	0 ms	0 KB	-