Package g0901_1000.s0955_delete_columns_to_make_sorted_ii

Class Solution

java.lang.Object
g0901_1000.s0955_delete_columns_to_make_sorted_ii.Solution
public class Solution extends java.lang.Object
955 - Delete Columns to Make Sorted II.

Medium

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 its elements in lexicographic order (i.e., strs[0] <= strs[1] <= strs[2] <= ... <= strs[n - 1]). Return the minimum possible value of answer.length.

Example 1:

Input: strs = [“ca”,“bb”,“ac”]

Output: 1

Explanation:

After deleting the first column, strs = [“a”, “b”, “c”].

Now strs is in lexicographic order (ie. strs[0] <= strs[1] <= strs[2]).

We require at least 1 deletion since initially strs was not in lexicographic order, so the answer is 1.

Example 2:

Input: strs = [“xc”,“yb”,“za”]

Output: 0

Explanation:

strs is already in lexicographic order, so we do not need to delete anything.

Note that the rows of strs are not necessarily in lexicographic order:

i.e., it is NOT necessarily true that (strs[0][0] <= strs[0][1] <= …)

Example 3:

Input: strs = [“zyx”,“wvu”,“tsr”]

Output: 3

Explanation: We have to delete every column.

Constraints:

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

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    minDeletionSize(java.lang.String[] strs)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • minDeletionSize

      public int minDeletionSize(java.lang.String[] strs)