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# 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'`.

## ac

```java
```