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.
You want to delete the columns that are not sorted lexicographically. A column is sorted if its characters from top to bottom are in nondecreasing lexicographic order.
Return the number of columns that you will delete.
Example 1
Input
strs = ["cba","daf","ghi"]Output
1Columns 0 and 2 are sorted, but column 1 is not, so you only need to delete 1 column.
Example 2
Input
strs = ["a","b"]Output
0Column 0 is the only column and is sorted, so you will not delete any columns.
Constraints
- n == strs.length
- 1 <= n <= 100
- 1 <= strs[i].length <= 1000
- strs[i] consists of lowercase English letters.