73. Set Matrix Zeroes | LeetCode | Top Interview 150 | Coding Questions

Problem Link

https://leetcode.com/problems/set-matrix-zeroes/

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Detailed Step-by-Step Explanation

https://leetcode.com/problems/set-matrix-zeroes/solutions/7473296/most-optimal-smartest-solution-o1-space-lmk4w

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Solution

class Solution {
    public void setZeroes(int[][] matrix) {

        boolean firstRow = false;
        boolean firstCol = false;

        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[0].length; j++) {
                if (matrix[i][j] == 0) {
                    if (i == 0) firstRow = true;
                    if (j == 0) firstCol = true;
                    matrix[0][j] = 0;
                    matrix[i][0] = 0;
                }
            }
        }

        for (int i = 1; i < matrix.length; i++) {
            for (int j = 1; j < matrix[0].length; j++) {
                if (matrix[0][j] == 0 || matrix[i][0] == 0) {
                    matrix[i][j] = 0;
                }
            }
        }

        if (firstRow) {
            for (int j = 0; j < matrix[0].length; j++) {
                matrix[0][j] = 0;
            }
        }

        if (firstCol) {
            for (int i = 0; i < matrix.length; i++) {
                matrix[i][0] = 0;
            }
        }
    }
}