Package g0901_1000.s0944_delete_columns_to_make_sorted

Class Solution

  • public class Solution
extends Object
    944 - Delete Columns to Make Sorted.

    Easy

    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:

     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 while column 1 ('b', 'c', 'a') is not, so you would delete column 1.

    Return the number of columns that you will delete.

    Example 1:

    Input: strs = [“cba”,“daf”,“ghi”]

    Output: 1

    Explanation: The grid looks as follows:

     cba 
 daf 
 ghi

    Columns 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: 0

    Explanation: The grid looks as follows:

     a 
 b

    Column 0 is the only column and is sorted, so you will not delete any columns.

    Example 3:

    Input: strs = [“zyx”,“wvu”,“tsr”]

    Output: 3

    Explanation: The grid looks as follows:

     zyx 
 wvu 
 tsr

    All 3 columns are not sorted, so you will delete all 3.

    Constraints:

    • n == strs.length
    • 1 <= n <= 100
    • 1 <= strs[i].length <= 1000
    • strs[i] consists of lowercase English letters.

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • minDeletionSize

        public int minDeletionSize​(String[] strs)