работает, принты

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

struct edge
{
    int idx;
    int a;
    int b;
    int cost;
};

struct vertex
{
    bool visited = false;
    std::vector<struct edge> adj_list = {};
    int count_edges = 0;
};

void addEdge(int i, int j, int cost, vector<vertex>& vertexes)
{
    edge buff;

    buff.idx = j;
    buff.cost = cost;
    buff.a = i;
    buff.b = j;

    vertexes[i].adj_list.push_back(buff);

    buff.idx = i;
    vertexes[j].adj_list.push_back(buff);

    vertexes[i].count_edges++;
    vertexes[j].count_edges++;
}


struct Compare
{
    bool operator()(edge& o1, edge& o2) const
    {
        return o1.cost > o2.cost;
    }
};

void showpq(priority_queue<struct edge, vector<struct edge>, Compare> gq)
{
    priority_queue<struct edge, vector<struct edge>, Compare> g = gq;
    while (!g.empty())
    {
        cout << '\t' << g.top().cost;
        g.pop();
    }
    cout << '\n';
}

int main()
{
    priority_queue<struct edge, vector<struct edge>, Compare> heap;

    int n, m;
    cin >> n >> m;

    int a, b, c;
    vector<struct vertex> vertexes(n);
    struct edge EDG2;

    for (int i = 0; i < m; ++i)
    {
        cin >> a >> b >> c;

        addEdge(a - 1, b - 1, c, vertexes);

        if (a == 1 | b == 1)
        {
            EDG2.a = a - 1;
            EDG2.b = b - 1;
            EDG2.cost = c;
            heap.push(EDG2);
        }
    }

    showpq(heap);


    cout << "\n print:" << endl;
    for (int i = 0; i < n; i++)
    {
        int size = vertexes[i].adj_list.size();

        cout << "idx =: ";
        for (int j = 0; j < size; ++j)
        {
            cout << vertexes[i].adj_list[j].a << " " << vertexes[i].adj_list[j].b << " ;";
        }


        cout << ";   edge_value =: ";
        for (int j = 0; j < size; ++j)
        {
            cout << vertexes[i].adj_list[j].cost << " ";
        }
        cout << endl;
    }

    vertexes[0].visited = true;
    struct edge EDG;
    int new_vertex;
    int max = 0;


    for (int i = 0; i < n - 1; ++i)
    {

        EDG = heap.top();

        heap.pop();
        cout << "Взял очередное мин ребро  " << EDG.a + 1 << " " << EDG.b + 1 << " " << EDG.cost
             << endl;
        if (max < EDG.cost)
        {
            max = EDG.cost;
            cout << "new max = " << max << endl;
        }


        if (vertexes[EDG.a].visited)
        {
            new_vertex = EDG.b;
            cout << EDG.a + 1 << " уже посещено поэтому новая вершина - " << EDG.b + 1 << endl;
            vertexes[new_vertex].visited = true;
        }
        else
        {
            new_vertex = EDG.a;
            cout << EDG.b + 1 << " уже посещено поэтому новая вершина - " << EDG.a + 1 << endl;
            vertexes[new_vertex].visited = true;
        }

        cout << "new vert = " << new_vertex + 1 << endl;

        cout << " у new vert " << vertexes[new_vertex].count_edges
             << " рёбер, щас буду их добавлять " << endl;
        for (int j = 0; j < vertexes[new_vertex].count_edges; ++j)
        {

            EDG = vertexes[new_vertex].adj_list[j];
            cout << "Добавляю ребро " << EDG.a + 1 << " " << EDG.b + 1 << " " << EDG.cost
                 << " ... ";
            if (not vertexes[EDG.idx].visited)
            {
                // EDG.a = new_vertex;
                // EDG.b = EDG.idx;
                heap.push(EDG);
                cout << "ребро с концом в не посещенной вершиной - добавлено" << endl;
                showpq(heap);
            }
            else
                cout << "ребро не подходит " << endl;
        }
        cout << " Закончил, на данный момент max = " << max << endl;
    }

    cout << "max = " << max << endl;


    return 0;
}