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Given an integer array **Arr[] **of size **N**. The task is to find sum of it.

**Example 1:**

**Input:
**N = 4
Arr[] = {1, 2, 3, 4}
**Output:** 10
**Explanation:** 1 + 2 + 3 + 4 = 10.

**Example 2:**

**Input:
**N = 3
Arr[] = {1, 3, 3}
**Output:** 7
**Explanation:** 1 + 3 + 3 = 7.

**Your Task:**

Complete the function **sum()** which takes array **arr **and single integer **n**, as input parameters and returns an integer denoting the answer. You don't to print answer or take inputs.

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

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

**Constraints:**

1 <= N <= 10^{5}

1 <= Arr[i] <= 10^{4}

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Sum of Array

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