Submission #1350333

#	Time	Username	Problem	Language	Result	Execution time	Memory
1350333		Zone_zonee	Network (BOI15_net)	C++20	0 / 100	0 ms	344 KiB

net

#include <bits/stdc++.h>
using namespace std;
const int N = 5e5+10;

int in[N];
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    for(int i = 1; i < n; ++i){
        int u, v;
        cin >> u >> v;
        in[u]++;
        in[v]++;
    }
    vector<int> leaf;
    for(int i = 1; i <= n; ++i){
        if(in[i] == 1) leaf.push_back(i);
    }
    cout << (int(leaf.size())+1)/2 << '\n';
    if(int(leaf.size())&1) cout << leaf.back() << ' ' << leaf.front() << '\n';
}

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