Lab 6 - Graph Kruskacl

#include <iostream>
#include <fstream>

using namespace std;

class Graph
{
private:
    int nrNodes;
    int matrix[100][100];
    int viz[100];
    int queue[100];

public:
    Graph()
    {
        nrNodes = 100;
        for (int i = 1; i <= nrNodes; i++)
        {
            viz[i] = 0;
            queue[i] = 0;
            for(int j = 1; j <= nrNodes; j++)
                matrix[i][j] = 0;
        }

    }
    void reinit()
    {
        for(int i = 1; i<= nrNodes; i++)
            viz[i] = 0;
    }
    void readGraph();
    void DFS(int current);
    void BFS(int start);
};

void Graph::readGraph()
{
    int firstNode, secondNode;
    ifstream f("input.txt");
    int nrOfEdges;
    f>>nrOfEdges;
    f>>nrNodes;
    for(int i = 1; i <= nrOfEdges; i++)
    {
        f>>firstNode>>secondNode;
        matrix[firstNode][secondNode] = matrix[secondNode][firstNode] = 1;
    }
    f.close();
}

void Graph::DFS(int current)
{
    if (viz[current] == 1)
        return;

    viz[current] = 1;

    cout<<current<<' ';

    for (int i = 1; i <= nrNodes; i++)
        if(matrix[current][i] == 1)
            DFS(i);
}

void Graph::BFS(int start)
{
    queue[1] = start;
    viz[start] = 1;
    int p = 1, u = 1;
    int current;

    while (p <= u)//coada nevida
    {
        current = queue[p];
        p++;
        cout<<current<<' ';
        for (int i = 1; i <= nrNodes; i++)
            if (matrix[current][i] == 1 && viz[i] == 0)
            {
                u++;
                queue[u] = i;
                viz[i] = 1;
            }
    }
}

int main()
{
    Graph g;
    g.readGraph();
    cout<<"DFS: ";
    g.DFS(1);
    cout<<endl;
    g.reinit();
    cout<<"BFS: ";
    g.BFS(1);

    return 0;
}


INPUT:
6 6
1 2
1 5
2 3
2 4
3 4
3 6