Chef and Subarrays

Chef is playing a game where he has an array $A$ of $N$ integers, and an integer $K$. He looks at every subarray of length $K$, and writes its sum on a piece of paper. If a number appears as the sum of multiple subarrays of length $K$, then he only writes down that number once. Chef is lazy and doesn't like to write numbers. You, being a friend of Chef, want to modify the array such that Chef w