import java.util.Scanner;
import java.io.File;

class Graph {
    public int size;
    public int[][] matrix;

    public Graph(int size, int[][] matrix) {
        this.size = size;
        this.matrix = matrix;
    }

    public Graph(int size) {
        this.size = size;
        this.matrix = new int[size][size];
    }

    public void addEdge(int fromIndex, int toIndex) {
        matrix[fromIndex][toIndex] = 1;
        matrix[toIndex][fromIndex] = 1;
    }

    public void removeEdge(int fromIndex, int toIndex) {
        matrix[fromIndex][toIndex] = 0;
        matrix[toIndex][fromIndex] = 0;
    }

    public void printGraph() {
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}