525\. Contiguous Array

Medium

Given a binary array `nums`, return _the maximum length of a contiguous subarray with an equal number of_ `0` _and_ `1`.

**Example 1:**

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

**Output:** 2

**Explanation:** [0, 1] is the longest contiguous subarray with an equal number of 0 and 1.

**Example 2:**

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

**Output:** 2

**Explanation:** [0, 1] (or [1, 0]) is a longest contiguous subarray with equal number of 0 and 1.

**Constraints:**

*   <code>1 <= nums.length <= 10<sup>5</sup></code>
*   `nums[i]` is either `0` or `1`.