Revise paste Untitled

#include <iostream>
#include <vector>
#include <queue>
using namespace std;

int main() {
    int k;
    cin >> k;
    vector<int> graph[k + 10];
    for(int i = 0; i < k - 1; i++) {
        int a, b;
        cin >> a >> b;
        graph[a].push_back(b);
        graph[b].push_back(a);
    }
    bool visited[k + 10];
    for(int i = 0; i <= k; i++) {
        visited[i] = false;
    }
    queue<int> q;
    q.push(0);
    visited[0] = true;
    
    while(!q.empty()) {
        int tocka = q.front();
        q.pop();
        cout << tocka << " ";
        for(int i = 0; i < graph[tocka].size(); i++) {
            int sosed = graph[tocka][i];
            if(!visited[sosed]) {
                visited[sosed] = true;
                q.push(sosed);
            }
        }
    }
    
    q.push(k);
    visited[k] = true;
    vector<int> v;
    while(!q.empty()) {
        int tocka = q.front();
        q.pop();
        v.push_back(tocka);
        for(int i = 0; i < graph[tocka].size(); i++) {
            int sosed = graph[tocka][i];
            if(!visited[sosed]) {
                visited[sosed] = true;
                q.push(sosed);
            }
        }
    }
    
    for(int i = v.size() - 1; i >= 0; i--) {
        cout << v[i] << " ";
    }
    return 0;
}