0944. Delete Columns to Make Sorted
https://leetcode.com/problems/delete-columns-to-make-sorted
Description
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.
ac
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