960. Delete Columns to Make Sorted III
Description
You are given an array of n
strings strs
, all of the same length.
We may choose any deletion indices, and we delete all the characters in those indices for each string.
For example, if we have strs = ["abcdef","uvwxyz"]
and deletion indices {0, 2, 3}
, then the final array after deletions is ["bef", "vyz"]
.
Suppose we chose a set of deletion indices answer
such that after deletions, the final array has every string (row) in lexicographic order. (i.e., (strs[0][0] <= strs[0][1] <= ... <= strs[0][strs[0].length - 1])
, and (strs[1][0] <= strs[1][1] <= ... <= strs[1][strs[1].length - 1])
, and so on). Return the minimum possible value of answer.length
.
Example 1:
Input: strs = ["babca","bbazb"] Output: 3 Explanation: After deleting columns 0, 1, and 4, the final array is strs = ["bc", "az"]. Both these rows are individually in lexicographic order (ie. strs[0][0] <= strs[0][1] and strs[1][0] <= strs[1][1]). Note that strs[0] > strs[1] - the array strs is not necessarily in lexicographic order.
Example 2:
Input: strs = ["edcba"] Output: 4 Explanation: If we delete less than 4 columns, the only row will not be lexicographically sorted.
Example 3:
Input: strs = ["ghi","def","abc"] Output: 0 Explanation: All rows are already lexicographically sorted.
Constraints:
n == strs.length
1 <= n <= 100
1 <= strs[i].length <= 100
strs[i]
consists of lowercase English letters.
Solutions
Solution 1
1 2 3 4 5 6 7 8 9 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 |
|