22 lines
509 B
Python
22 lines
509 B
Python
def luhn_checksum(card_number):
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def digits_of(n):
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return [int(d) for d in str(n)]
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digits = digits_of(card_number)
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odd_digits = digits[-1::-2]
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even_digits = digits[-2::-2]
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checksum = 0
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checksum += sum(odd_digits)
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for d in even_digits:
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checksum += sum(digits_of(d * 2))
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return checksum % 10
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def is_luhn_valid(card_number):
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return luhn_checksum(card_number) == 0
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n = int(input())
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for _ in range(n):
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print("PASS" if is_luhn_valid(input()) else "FAIL")
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