oj.uz

Submission #151236

# Submission time Handle Problem Language Result Execution time Memory
151236 2019-09-02T09:42:35 Z cfalas Network (BOI15_net) C++14
0 / 100
 237 ms 262148 KB 
#include<bits/stdc++.h>
using namespace std;
vector<vector<int> > adj;
vector<int> ans;

void dfs(int s, int p=-1){
	if(adj[s].size()==1){
		ans.push_back(s);
	}
	for(auto v : adj[s] ){
		if(v!=p) dfs(v, s);
	}
}
 
int main(){
	int n;
	adj.assign(n+100000000, vector<int>());
	cin>>n;
	for(int i=0;i<n-1;i++){
		int b, c;
		cin>>b>>c;
		adj[b].push_back(c);
		adj[c].push_back(b);
	}
	dfs(1);
	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

net.cpp: In function 'int main()':
net.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(ans.size()+1)/2;i++){
              ~^~~~~~~~~~~~~~~~~
net.cpp:17:14: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  adj.assign(n+100000000, vector<int>());
             ~^~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 237 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Runtime error 237 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Runtime error 237 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -