Convenience Store

Challenge Difficulty: Medium | Estimated completion time: ~20 minutes

Given a total due and an array representing the amount of change in your pocket, determine whether or not you are able to pay for the item.

Change will always be represented in the following order: quarters, dimes, nickels, pennies.

Example: changeEnough([25, 20, 5, 0], 4.25) return true because:

25 quarters, 20 dimes, 5 nickels and 0 pennies gives you 6.25 + 2 + .25 + 0 = 8.50.

This means you can afford the item, so return true.

Examples

changeEnough([2, 100, 0, 0], 14.11) ➞ false
 
changeEnough([0, 0, 20, 5], 0.75) ➞ true
 
changeEnough([30, 40, 20, 5], 12.55) ➞ true
 
changeEnough([10, 0, 0, 50], 3.85) ➞ false
 
changeEnough([1, 0, 5, 219], 19.99) ➞ false

Notes

• quarter = 25 cents / $0.25
• dime= 10 cents / $0.10
• nickel = 5 cents / $0.05
• penny = 1 cent / $0.01

Solution

Python

def change_enough(change: list[int], total: float) -> bool: """Check if you have enough change to pay for an item. Args: change: List of [quarters, dimes, nickels, pennies] total: Total amount due in dollars Returns: True if you can afford the item, False otherwise """ quarters, dimes, nickels, pennies = change total_cents = ( quarters * 25 + dimes * 10 + nickels * 5 + pennies * 1 ) total_due_cents = round(total * 100) return total_cents >= total_due_cents if __name__ == "__main__": print(change_enough([2, 100, 0, 0], 14.11)) # False print(change_enough([0, 0, 20, 5], 0.75)) # True print(change_enough([30, 40, 20, 5], 12.55)) # True print(change_enough([10, 0, 0, 50], 3.85)) # False print(change_enough([1, 0, 5, 219], 19.99)) # False

Output