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https://github.com/TheAlgorithms/Python.git
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ff961fa04a
Fix: Improve minimum coin change logic & add doctest - Removed unnecessary int() conversions to improve efficiency. - Updated function parameter type (value: str → value: int) to avoid redundant type casting. - Added try-except handling to prevent ValueError when user input is not a number. - Implemented testmod() to enable automated doctest verification. - Fixed issue where input denominations were not sorted in descending order, which previously led to incorrect results.
117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
from doctest import testmod
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"""
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Test cases:
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Do you want to enter your denominations ? (Y/N) :N
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Enter the change you want to make in Indian Currency: 987
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Following is minimal change for 987 :
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500 100 100 100 100 50 20 10 5 2
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Do you want to enter your denominations ? (Y/N) :Y
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Enter number of denomination:10
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1
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5
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10
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20
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50
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100
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200
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500
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1000
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2000
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Enter the change you want to make: 18745
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Following is minimal change for 18745 :
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2000 2000 2000 2000 2000 2000 2000 2000 2000 500 200 20 20 5
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Do you want to enter your denominations ? (Y/N) :N
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Enter the change you want to make: 0
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The total value cannot be zero or negative.
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Do you want to enter your denominations ? (Y/N) :N
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Enter the change you want to make: -98
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The total value cannot be zero or negative.
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Do you want to enter your denominations ? (Y/N) :Y
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Enter number of denomination:5
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1
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5
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100
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500
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1000
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Enter the change you want to make: 456
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Following is minimal change for 456 :
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100 100 100 100 5 5 5 5 5 5 5 5 5 5 5 1
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"""
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def find_minimum_change(denominations: list[int], value: int) -> list[int]:
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"""
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Find the minimum change from the given denominations and value.
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Args:
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denominations (list[int]): List of available denominations.
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value (int): The amount of money to be changed.
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Returns:
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list[int]: List of denominations representing the minimal change.
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Examples:
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>>> find_minimum_change([1, 5, 10, 20, 50, 100, 200, 500, 1000, 2000], 18745)
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[2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000, 2000, 500, 200, 20, 20, 5]
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>>> find_minimum_change([1, 2, 5, 10, 20, 50, 100, 500, 2000], 987)
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[500, 100, 100, 100, 100, 50, 20, 10, 5, 2]
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>>> find_minimum_change([1, 2, 5, 10, 20, 50, 100, 500, 2000], 0)
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[]
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>>> find_minimum_change([1, 2, 5, 10, 20, 50, 100, 500, 2000], -98)
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[]
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>>> find_minimum_change([1, 5, 100, 500, 1000], 456)
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[100, 100, 100, 100, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1]
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"""
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# Sort denominations in descending order (biggest first)
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denominations.sort(reverse=True)
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# Initialize Result
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answer = []
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# Find minimal change using largest denominations first
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for denomination in denominations:
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while value >= denomination:
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value -= denomination
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answer.append(denomination)
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return answer
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# Driver Code
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if __name__ == "__main__":
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# Run doctest
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testmod()
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denominations = []
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value = 0
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if input("Do you want to enter your denominations ? (y/n): ").strip().lower() == "y":
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try:
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n = int(input("Enter the number of denominations you want to add: ").strip())
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for i in range(n):
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denominations.append(int(input(f"Denomination {i+1}: ").strip()))
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value = int(input("Enter the change you want to make in Indian Currency: ").strip())
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except ValueError:
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print("Invalid input. Please enter valid numbers.")
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exit(1)
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else:
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# Default denominations for Indian Currency
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denominations = [1, 2, 5, 10, 20, 50, 100, 500, 2000]
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try:
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value = int(input("Enter the change you want to make: ").strip())
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except ValueError:
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print("Invalid input. Please enter a valid number.")
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exit(1)
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# Ensure denominations are sorted in descending order
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denominations.sort(reverse=True)
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if value <= 0:
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print("The total value cannot be zero or negative.")
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else:
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print(f"Following is minimal change for {value}: ")
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answer = find_minimum_change(denominations, value)
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print(" ".join(map(str, answer))) # Optimized printing format
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