The challenge has mentioned that "The next N lines contains a string of N length". This one is a miss match in practice and lead to my submission failure due to the number of column is smaller than the number of row.

One of the test cases are wrong, the N value isn't the number of elements on the list and the lenght of each string?

3

3

abc

lmp

qrt

3

mpxz

abcd

wlmf

4

abc

hjk

mpq

rtv

Yeah kinda annoying for them to say square grid which implies elements in input have the same length as the number of inputs.

Problem and tests are not consistent, the problem states square grids but the test have non square grids.

Scala Solution

def gridChallenge(grid: Array[String]): String = {
    // Write your code here
    val sortedGrid = grid.map(row => row.sorted)
    val n = sortedGrid.length
    val m = sortedGrid(0).length
    for (col <- 0 until m) {
    for (row <- 0 until n - 1) {
      if (sortedGrid(row)(col) > sortedGrid(row + 1)(col)) {
        return "NO"
      }
    }
  }

  "YES"


    }