oj.uz

Submission #85212

# Submission time Handle Problem Language Result Execution time Memory
85212 2018-11-18T23:42:33 Z Mahmoud_Adel Network (BOI15_net) C++14
0 / 100
 14 ms 12464 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
const int N = 5e5+5;
vector<int> adj[N];
int main()
{
    int n;
    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> vec;
    for(int i=0; i<n; i++) if(adj[i].size() == 1) vec.push_back(i);
    if(vec.size()%2)
    {
        cout << vec.size()/2 + 1 << endl;
        cout << vec[0]+1 << " " << vec[1]+1 << endl;
        for(int i=1; i<vec.size()-1; i+=2) cout << vec[i]+1 << " " << vec[i+1]+1 << endl;
    }
    else
    {
        cout << vec.size()/2 << endl;
        for(int i=0; i<vec.size()-1; i+=2) cout << vec[i]+1 << " " << vec[i+1]+1 << endl;
    }
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=1; i<vec.size()-1; i+=2) cout << vec[i]+1 << " " << vec[i+1]+1 << endl;
                      ~^~~~~~~~~~~~~
net.cpp:28:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0; i<vec.size()-1; i+=2) cout << vec[i]+1 << " " << vec[i+1]+1 << endl;
                      ~^~~~~~~~~~~~~

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 13 ms 12024 KB Output is correct
2 Correct 12 ms 12164 KB Output is correct
3 Correct 12 ms 12184 KB Output is correct
4 Correct 12 ms 12296 KB Output is correct
5 Correct 14 ms 12296 KB Output is correct
6 Correct 12 ms 12324 KB Output is correct
7 Correct 12 ms 12372 KB Output is correct
8 Correct 12 ms 12372 KB Output is correct
9 Correct 13 ms 12464 KB Output is correct
10 Incorrect 13 ms 12464 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 13 ms 12024 KB Output is correct
2 Correct 12 ms 12164 KB Output is correct
3 Correct 12 ms 12184 KB Output is correct
4 Correct 12 ms 12296 KB Output is correct
5 Correct 14 ms 12296 KB Output is correct
6 Correct 12 ms 12324 KB Output is correct
7 Correct 12 ms 12372 KB Output is correct
8 Correct 12 ms 12372 KB Output is correct
9 Correct 13 ms 12464 KB Output is correct
10 Incorrect 13 ms 12464 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 13 ms 12024 KB Output is correct
2 Correct 12 ms 12164 KB Output is correct
3 Correct 12 ms 12184 KB Output is correct
4 Correct 12 ms 12296 KB Output is correct
5 Correct 14 ms 12296 KB Output is correct
6 Correct 12 ms 12324 KB Output is correct
7 Correct 12 ms 12372 KB Output is correct
8 Correct 12 ms 12372 KB Output is correct
9 Correct 13 ms 12464 KB Output is correct
10 Incorrect 13 ms 12464 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -