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Given an array **cost[]** of positive integers of size **N** and an integer **W**, cost[i] represents the cost of **‘i’** kg packet of oranges, the task is to find the minimum cost to buy **W** kgs of oranges. If it is not possible to buy exactly **W** kg oranges then the output will be -1

**Note:**

1. cost[i] = -1 means that ‘i’ kg packet of orange is unavailable

2. It may be assumed that there is infinite supply of all available packet types.

**Example 1:**

**Input**: N = 5, arr[] = {20, 10, 4, 50, 100}
W = 5
**Output:** 14
**Explanation**: choose two oranges to minimize
cost. First orange of 2Kg and cost 10.
Second orange of 3Kg and cost 4.

**Example 2:**

**Input**: N = 5, arr[] = {-1, -1, 4, 3, -1}
W = 5
**Output:** -1
**Explanation**: It is not possible to buy 5
kgs of oranges

**Your Task: **

You don't need to read input or print anything. Complete the function ** minimumCost() **which takes

1 ≤ N, W ≤ 2*10

-1 ≤ cost[i] ≤ 10

cost[i] ≠ 0

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Minimum cost to fill given weight in a bag

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