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g3201_3300.s3206_alternating_groups_i.readme.md Maven / Gradle / Ivy

3206\. Alternating Groups I

Easy

There is a circle of red and blue tiles. You are given an array of integers `colors`. The color of tile `i` is represented by `colors[i]`:

*   `colors[i] == 0` means that tile `i` is **red**.
*   `colors[i] == 1` means that tile `i` is **blue**.

Every 3 contiguous tiles in the circle with **alternating** colors (the middle tile has a different color from its **left** and **right** tiles) is called an **alternating** group.

Return the number of **alternating** groups.

**Note** that since `colors` represents a **circle**, the **first** and the **last** tiles are considered to be next to each other.

**Example 1:**

**Input:** colors = [1,1,1]

**Output:** 0

**Explanation:**

![](https://assets.leetcode.com/uploads/2024/05/16/image_2024-05-16_23-53-171.png)

**Example 2:**

**Input:** colors = [0,1,0,0,1]

**Output:** 3

**Explanation:**

![](https://assets.leetcode.com/uploads/2024/05/16/image_2024-05-16_23-47-491.png)

Alternating groups:

**![](https://assets.leetcode.com/uploads/2024/05/16/image_2024-05-16_23-50-441.png)**![](https://assets.leetcode.com/uploads/2024/05/16/image_2024-05-16_23-48-211.png)**![](https://assets.leetcode.com/uploads/2024/05/16/image_2024-05-16_23-49-351.png)**

**Constraints:**

*   `3 <= colors.length <= 100`
*   `0 <= colors[i] <= 1`