## Problem Statement

Given an array of positive numbers and a positive number 'k,' find the **maximum sum of any contiguous subarray of size 'k'**.

**Example 1:**

```
Input: arr = [2, 1, 5, 1, 3, 2], k=3
Output: 9
Explanation: Subarray with maximum sum is [5, 1, 3].
```

**Example 2:**

```
Input: arr = [2, 3, 4, 1, 5], k=2
Output: 7
Explanation: Subarray with maximum sum is [3, 4].
```

## Try it yourself

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Python3

Python3