Package g1801_1900.s1888_minimum_number_of_flips_to_make_the_binary_string_alternating

Class Solution

java.lang.Object
g1801_1900.s1888_minimum_number_of_flips_to_make_the_binary_string_alternating.Solution
public class Solution extends java.lang.Object
1888 - Minimum Number of Flips to Make the Binary String Alternating.

Medium

You are given a binary string s. You are allowed to perform two types of operations on the string in any sequence:

  • Type-1: Remove the character at the start of the string s and append it to the end of the string.
  • Type-2: Pick any character in s and flip its value, i.e., if its value is '0' it becomes '1' and vice-versa.

Return the minimum number of type-2 operations you need to perform such that s becomes alternating.

The string is called alternating if no two adjacent characters are equal.

  • For example, the strings "010" and "1010" are alternating, while the string "0100" is not.

Example 1:

Input: s = “111000”

Output: 2

Explanation: Use the first operation two times to make s = “100011”.

Then, use the second operation on the third and sixth elements to make s = “101010”.

Example 2:

Input: s = “010”

Output: 0

Explanation: The string is already alternating.

Example 3:

Input: s = “1110”

Output: 1

Explanation: Use the second operation on the second element to make s = “1010”.

Constraints:

  • 1 <= s.length <= 105
  • s[i] is either '0' or '1'.

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    minFlips(java.lang.String s)
     

    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

    • minFlips

      public int minFlips(java.lang.String s)