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Given a non-negative number represented as a list of digits, add 1 to the number (increment the number represented by the digits). The digits are stored such that the most significant digit is first element of array.

**Example 1:**

**Input**:
N = 3
arr[] = {1, 2, 4}
**Output**:
1 2 5
**Explanation**:
124+1 = 125, and so the Output

**Example 2:**

**Input**:
N = 3
arr[] = {9,9,9}
**Output**:
1 0 0 0
**Explanation**:
999+1 = 1000, and so the output

**Your Task:**

You don't need to read input or print anything. You only need to complete the function** increment() **that takes an integer N, and an array arr of size N as input and returns a list of integers denoting the new number which we get after adding one to the number denoted by the array arr.

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

**Expected Auxilliary Space:** O(1)

**Constraints:**

1 <= N <= 10^{5}

0 <= arr_{i} <= 9

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