1888. Minimum Number of Flips to Make the Binary String Alternating

https://leetcode.com/problems/minimum-number-of-flips-to-make-the-binary-string-alternating

Description

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'.

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