# LeetCode challenge – Set Matrix Zeroes – Java Solution

This is a solution for the LeetCode challenge – Set Matrix Zeroes written in Java ( Source )

Given a m x n matrix, if an element is 0, set its entire row and column to 0.

public class SetMatrixZeroes { public static void main(String[] args) throws Exception { int[][] matrix = {{0, 8, 7}, {9, 0, 8}, {9, 9, 0}}; new SetMatrixZeroes().setZeroes(matrix); } public void setZeroes(int[][] matrix) { Set<Integer> row = new HashSet<>(); Set<Integer> col = new HashSet<>(); int m = matrix.length; int n = matrix[0].length; for (int i = 0; i < m; i++) { for (int j = 0; j < n; j++) { if (matrix[i][j] == 0) { row.add(i); col.add(j); } } } for (int r : row) { for (int j = 0; j < n; j++) { matrix[r][j] = 0; } } for (int c : col) { for (int i = 0; i < m; i++) { matrix[i][c] = 0; } } } }