Coin choices with repeats
Return unordered ways to choose r coin denominations when repetition is allowed.
What you’ll practice
This Level 4 exercise focuses on combinations_with_replacement in the Itertools curriculum. Solve the challenge prompt above using clear, idiomatic Python and the relevant language or standard-library tools.
Relevant Python reference: re — Regular expression operations, itertools.combinations.
Sample Test Cases
coin_choices([1,2], r=2)[(1,1),(1,2),(2,2)]Further Reading
Reference Solution
Reveal Reference Solution
def coin_choices(coins: list[int], r: int): from itertools import combinations_with_replacement return list(combinations_with_replacement(coins, r))Pro Tips & Keyboard Shortcuts
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