73. Set Matrix Zeroes

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

JavaScript

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var setZeroes = function(matrix) {
  var resetRow = false
  var resetCol = false

  for (let i = 0; i < matrix[0].length; i++) {
    if (matrix[0][i] === 0) {
      resetRow = true
      break
    }
  }

  for (let i = 0; i < matrix.length; i++) {
    if (matrix[i][0] === 0) {
      resetCol = true
      break
    }
  }

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

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

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

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

Python

class Solution(object):

    def setZeroes(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: void Do not return anything, modify matrix in-place instead.
        """
        resetRow = resetCol = False

        for i in range(len(matrix[0])):
            if matrix[0][i] == 0:
                resetRow = True
                break

        for i in range(len(matrix)):
            if matrix[i][0] == 0:
                resetCol = True
                break

        for i in range(1, len(matrix)):
            for j in range(1, len(matrix[i])):
                if matrix[i][j] == 0:
                    matrix[i][0] = matrix[0][j] = 0

        for i in range(1, len(matrix)):
            for j in range(1, len(matrix[i])):
                if matrix[i][0] == 0 or matrix[0][j] == 0:
                    matrix[i][j] = 0

        if resetRow:
            for i in range(len(matrix[0])):
                matrix[0][i] = 0

        if resetCol:
            for i in range(len(matrix)):
                matrix[i][0] = 0