oj.uz

Submission #126212

# Submission time Handle Problem Language Result Execution time Memory
126212 2019-07-07T09:14:50 Z Vardanyan Network (BOI15_net) C++14
0 / 100
 13 ms 12152 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 500*1000+5;
vector<int> g[N];
int main(){
    ios_base::sync_with_stdio(false);
    int n;
    cin>>n;
    for(int i = 1;i<=n-1;i++){
        int x,y;
        cin>>x>>y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    vector<int> lf;
    for(int i = 1;i<=n;i++){
        if(g[i].size() == 1) lf.push_back(i);
    }
    cout<<(lf.size()+1)/2<<endl;
    for(int i = 0;i<lf.size()-1;i+=2){
        cout<<lf[i]<< " "<<lf[i+1]<<endl;
    }
    if(lf.size()%2){
        cout<<lf[lf.size()-1]<<" "<<lf[lf.size()-2]<<endl;
    }
    return 0;
}

Compilation message

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

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 12024 KB Output is correct
2 Correct 13 ms 12152 KB Output is correct
3 Correct 12 ms 12024 KB Output is correct
4 Correct 12 ms 12024 KB Output is correct
5 Correct 12 ms 12024 KB Output is correct
6 Correct 12 ms 12024 KB Output is correct
7 Correct 12 ms 12152 KB Output is correct
8 Correct 12 ms 12152 KB Output is correct
9 Correct 12 ms 12152 KB Output is correct
10 Incorrect 12 ms 12024 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 12 ms 12024 KB Output is correct
2 Correct 13 ms 12152 KB Output is correct
3 Correct 12 ms 12024 KB Output is correct
4 Correct 12 ms 12024 KB Output is correct
5 Correct 12 ms 12024 KB Output is correct
6 Correct 12 ms 12024 KB Output is correct
7 Correct 12 ms 12152 KB Output is correct
8 Correct 12 ms 12152 KB Output is correct
9 Correct 12 ms 12152 KB Output is correct
10 Incorrect 12 ms 12024 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 12 ms 12024 KB Output is correct
2 Correct 13 ms 12152 KB Output is correct
3 Correct 12 ms 12024 KB Output is correct
4 Correct 12 ms 12024 KB Output is correct
5 Correct 12 ms 12024 KB Output is correct
6 Correct 12 ms 12024 KB Output is correct
7 Correct 12 ms 12152 KB Output is correct
8 Correct 12 ms 12152 KB Output is correct
9 Correct 12 ms 12152 KB Output is correct
10 Incorrect 12 ms 12024 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -