Delete Columns To Make Sorted

Given an array of strings strs composed of lowercase letters, where each string is of the same length. You need to delete some columns to make the remaining columns organized lexicographically by rows. Return the minimum number of columns you need to delete. Examples Input: strs = ["cba","daf","ghi"] Output: 1 Explanation: Delete the first column. Input: strs = ["a","b"] Output: 0 Explanation: No need to delete any column. Input: strs = ["zyx","wvu","tsr"] Output: 3 Explanation: All columns need to be deleted. Constraints The length of strs is in the range [1, 1000]. The length of strs[i] is [1, 1000]. strs[i] is composed of lowercase letters only. Example Input cba daf ghi