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Given an array of 0's and 1's your task is to complete the function **maxLen** which returns size of the largest sub array with equal number of 0's and 1's. The function** maxLen** takes 2 arguments. The first argument is the array **A[]** and second argument is the size** 'N'** of the array **A[]**.

**Input:**

The first line of the input is** T** denoting the number of test cases. Then **T** test cases follow . Each test case contains two lines. The first line of each test case is a number **N** denoting the size of the array and in the next line are **N** space separated values of **A []**.

**Output:**

For each test case output in a new line the max length of the subarray.

**Constraints:**

1 <= T <= 100

1 <= N <= 100

0 <= A[] <= 1

**Example:
Input **

2

4

0 1 0 1

5

0 0 1 0 0

**Output**

4

2

**Explanation:
Testacase 1:** The array from index [0...3] contains equal number of 0's and 1's. Thus maximum length of subarray having equal number of 0's and 1's is 4.

Author: Shubham Joshi 1

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