| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 41211 |
2018-02-14T02:54:31 Z |
wzy |
Network (BOI15_net) |
C++14 |
|
12 ms |
12460 KB |
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> adj[500005];
int main(){
cin>>n;
for(int i= 0 ; i < n - 1 ; i++){
int x ,y;
cin>>x>>y;
x-- , y--;
adj[x].push_back(y);
adj[y].push_back(x);
}
vector<int> tocreate;
int lastv = -1;
for(int i = 0 ; i < n; i++){
if(adj[i].size() == 1) tocreate.push_back(i);
}
vector<pair<int,int> > edges;
while(!tocreate.empty()){
if(tocreate.size() == 1){
edges.push_back(pair<int,int>(lastv , tocreate.back()));
break;
}
else{
int u = tocreate.back();
tocreate.pop_back();
int v = tocreate.back();
tocreate.pop_back();
lastv = v;
edges.push_back(pair<int,int>(lastv,u));
}
}
cout<<edges.size()<<endl;
for(int j = 0 ; j < edges.size() ; j++){
pair<int,int> v = edges[j];
cout<<v.first + 1 <<" " << v.second + 1 << endl;
}
}
Compilation message
net.cpp: In function 'int main()':
net.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0 ; j < edges.size() ; j++){
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12140 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12140 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12252 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12304 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12304 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 9 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 10 |
Incorrect |
11 ms |
12460 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12140 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12140 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12252 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12304 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12304 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 9 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 10 |
Incorrect |
11 ms |
12460 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
12 ms |
12024 KB |
Output is correct |
| 2 |
Correct |
11 ms |
12140 KB |
Output is correct |
| 3 |
Correct |
10 ms |
12140 KB |
Output is correct |
| 4 |
Correct |
11 ms |
12252 KB |
Output is correct |
| 5 |
Correct |
11 ms |
12304 KB |
Output is correct |
| 6 |
Correct |
10 ms |
12304 KB |
Output is correct |
| 7 |
Correct |
10 ms |
12432 KB |
Output is correct |
| 8 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 9 |
Correct |
11 ms |
12460 KB |
Output is correct |
| 10 |
Incorrect |
11 ms |
12460 KB |
Breaking single line is causing network to disconnect. |
| 11 |
Halted |
0 ms |
0 KB |
- |
