DSAL/7C.cpp at main · shr128/DSAL · GitHub

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#include <iostream>
using namespace std;

int main()
{
    int n, i, j, k, row, col, mincost = 0, min;
    char op;

    cout << "Enter no. of vertices: ";
    cin >> n;

    int cost[n][n];
    int visit[n];

    for (i = 0; i < n; i++)
        visit[i] = 0;

    for (i = 0; i < n; i++)
    {
        for (j = 0; j < n; j++)
        {
            cost[i][j] = -1;
        }
    }

    for (i = 0; i < n; i++)
    {
        for (j = i + 1; j < n; j++)
        {
            cout << "Do you want an edge between " << i + 1 << " and " << j + 1 << ": ";
            // use 'i' & 'j' if your vertices start from 0
            cin >> op;

            if (op == 'y' || op == 'Y')
            {
                cout << "Enter weight: ";
                cin >> cost[i][j];
                cost[j][i] = cost[i][j];
            }
        }
    }

    visit[0] = 1;

    for (k = 0; k < n - 1; k++)
    {
        min = 999;

        for (i = 0; i < n; i++)
        {
            for (j = 0; j < n; j++)
            {
                if (visit[i] == 1 && visit[j] == 0)
                {
                    if (cost[i][j] != -1 && min > cost[i][j])
                    {
                        min = cost[i][j];
                        row = i;
                        col = j;
                    }
                }
            }
        }

        mincost += min;
        visit[col] = 1;
        cost[row][col] = cost[col][row] = -1;

        cout << row + 1 << "->" << col + 1 << endl;
        // use 'row' & 'col' if your vertices start from 0
    }

    cout << "\nMin. Cost: " << mincost;
    return 0;
}