944. Delete Columns to Make Sorted

You are given an array of n strings strs, all of the same length. The strings can be arranged such that there is one on each line, making a grid. - For example, strs = ["abc", "bce", "cae"] can be arranged as follows: abc bce cae You want to delete the columns that are not sorted lexicographically. In the above example (0-indexed), columns 0 ('a', 'b', 'c') and 2 ('c', 'e', 'e') are sorted, wh