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Given an array of 0s and 1s. Find the length of the largest subarray with equal number of 0s and 1s.

**Example 1:**

**Input:
**N = 4
A[] = {0,1,0,1}
**Output: **4**
Explanation: **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.

**Example 2:**

**Input:
**N = 5
A[] = {0,0,1,0,0}
**Output: **2

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **maxLen()** which takes the array arr[] and the size of the array as inputs and returns the length of the largest subarray with equal number of 0s and 1s.

**Expected Time Complexity:** O(N).

**Expected Auxiliary Space:** O(N).

**Constraints:**

1 <= N <= 10^{5}

0 <= A[] <= 1

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Largest subarray of 0's and 1's

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