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q0073.swift
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q0073.swift
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//
// q0073.swift
// LeetcodeSwift
//
// Created by NowOrNever on 05/03/2020.
// Copyright © 2020 DL. All rights reserved.
//
import Foundation
//73. Set Matrix Zeroes
//Medium
//
//1621
//
//271
//
//Add to List
//
//Share
//Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place.
//
//Example 1:
//
//Input:
//[
// [1,1,1],
// [1,0,1],
// [1,1,1]
//]
//Output:
//[
// [1,0,1],
// [0,0,0],
// [1,0,1]
//]
//Example 2:
//
//Input:
//[
// [0,1,2,0],
// [3,4,5,2],
// [1,3,1,5]
//]
//Output:
//[
// [0,0,0,0],
// [0,4,5,0],
// [0,3,1,0]
//]
//Follow up:
//
//A straight forward solution using O(mn) space is probably a bad idea.
//A simple improvement uses O(m + n) space, but still not the best solution.
//Could you devise a constant space solution?
//Accepted
//275,437
//Submissions
//655,629
class q0073Solution {
func setZeroes(_ matrix: inout [[Int]]) {
if matrix.count < 1 {
return
}
let matrixWidth = matrix[0].count
var mArray = [Bool].init(repeating: false, count: matrix.count)
var nArray = [Bool].init(repeating: false, count: matrixWidth)
for i in 0..<matrix.count {
for j in 0..<matrixWidth {
if matrix[i][j] == 0 {
mArray[i] = true
nArray[j] = true
}
}
}
for i in 0..<matrix.count {
for j in 0..<matrixWidth {
if mArray[i] || nArray[j] {
matrix[i][j] = 0
}
}
}
}
}
func q0073(){
let solution = q0073Solution()
var matrix = [[0,0,0,5],[4,3,1,4],[0,1,1,4],[1,2,1,3],[0,0,1,1]]
solution.setZeroes(&matrix)
print(matrix)
}