LeetCode --- 944. Delete Columns to Make Sorted 解题报告

Posted 2021-06-28 杨鑫newlfe

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&#