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Given an array and a number k, find the largest sum of the subarray containing at least k numbers. It may be assumed that the size of array is at-least k.

**Example 1:**

**Input :
**n = 4
arr[] = {-4, -2, 1, -3}
k = 2
**Output : **
-1
**Explanation :**
The sub array is {-2, 1}

**Input :
**n = 6** **
arr[] = {1, 1, 1, 1, 1, 1}
k = 2
**Output : **
6
**Explanation :**
The sub array is {1, 1, 1, 1, 1, 1}

**Your Task: **

You don't need to read input or print anything. Your task is to complete the function **maxSumWithK()** which takes the array **A[]**, its size **N **and an integer **K **as inputs and returns the value of the largest sum of the subarray containing at least k numbers.

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

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

**Constraints:**

1<=n<=10^{5}

1<=a[i]<=10^{5}

1<=k<=n

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Largest Sum Subarray of Size at least K

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