Minimum Cost Complete Solution

This article is part of the Scaler Topics Fortnightly Contest - 19

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Solution Approach

We will always select the discount with minimum value. So, that we have to buy minimum number of chocolates to get free chocolates.
Now, we have to sort the cost array and will have to go from end to begin of array A, and use our discount as soon as we can use it. And it is obvious that we will buy all the items like this.
We are going from end to begin of sorted array because the cost of free chocolate should not be greater than the paid one.

Time Complexity - O(|A|) Space Complexity - O(1)