Leetcode Sharad 73

class Solution:
    def setZeroes(self, matrix: 'List[List[int]]') -> 'None':
        """
        Do not return anything, modify matrix in-place instead.
        """

        # Get indexes of everything to be marked as 0

        if not len(matrix):
            return None

        mark_r = []
        mark_c = []
        len_r, len_c = len(matrix), len(matrix[0])
        for i, row in enumerate(matrix):
            for j, col in enumerate(row):
                if col == 0:
                    mark_r.append(i)
                    mark_c.append(j)
        for i in mark_r:
            k = 0
            while k<len_c:
                matrix[i][k] = 0
                k += 1
        for j in mark_c:
            k = 0
            while k<len_r:
                matrix[k][j] = 0
                k += 1
        # print(matrix)
        # return matrix