Maximal Square

Description

Given a 2D binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area.

Example:

Input: 

1 0 1 0 0
1 0 1 1 1
1 1 1 1 1
1 0 0 1 0
Output: 4

Solution(javascript)

/**
 * @param {character[][]} matrix
 * @return {number}
 */
var maximalSquare = function(matrix) {
    const getValue = (row, column) => {
        if(row < 0 || row >= matrix.length || column < 0 || column >= matrix[row].lenth) {
            return 0
        }
        return matrix[row][column]
    }
    let max = 0
    for(let i = 0; i < matrix.length; i++) {
        for(let j = 0; j < matrix[i].length; j++) {
            if(matrix[i][j] === "1") {
                matrix[i][j] = 1 + Math.min(
                    getValue(i,j - 1),
                    getValue(i-1,j ),
                    getValue(i-1, j-1)
                )

                max = Math.max(max, matrix[i][j])
            }
        }
    }
    return max * max
};