Submission #410595

#	Time	Username	Problem	Language	Result	Execution time	Memory
410595		iulia13	Network (BOI15_net)	C++14	0 / 100	9 ms	12044 KiB

net

#include <iostream>
#include <vector>
using namespace std;
const int N = 500005;
vector <int> g[N];
int v[N];
int main()
{
    int n, i, nr = 0, a, b;
    cin >> n;
    for (i = 1; i < n; i++)
    {
        cin >> a >> b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    for (i = 1; i <= n; i++)
        if (g[i].size() == 1)
            v[++nr] = i;
    if (nr % 2)
        v[++nr] = v[1];
    cout << nr / 2;
    for (i = 1; i <= nr; i += 2)
        cout << endl << v[i] << " " << v[i + 1];
    return 0;
}

• Subtask 1: 0 / 18
• Subtask 2: 0 / 45
• Subtask 3: 0 / 37