input_matrix.java

import java.util.Scanner;

public class input_matrix {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        // Input number of vertices
        System.out.print("Enter the number of vertices: ");
        int numberOfVertices = scanner.nextInt();

        // Initialize the adjacency matrix
        int[][] adjacencyMatrix = new int[numberOfVertices][numberOfVertices];

        // Input edges
        System.out.println("Enter the adjacency matrix:");
        for (int i = 0; i < numberOfVertices; i++) {
            for (int j = 0; j < numberOfVertices; j++) {
                System.out.print("Edge from " + i + " to " + j + " (0 if no edge, weight otherwise): ");
                adjacencyMatrix[i][j] = scanner.nextInt();
            }
        }

        // Print the adjacency matrix
        System.out.println("\nAdjacency Matrix:");
        for (int i = 0; i < numberOfVertices; i++) {
            for (int j = 0; j < numberOfVertices; j++) {
                System.out.print(adjacencyMatrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}