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* Rename all Project Euler directories: Reason: The change was done to maintain consistency throughout the directory and to keep all directories in sorted order. Due to the above change, some config files had to be modified: 'problem_22` -> `problem_022` * Update scripts to pad zeroes in PE directories
33 lines
880 B
Python
33 lines
880 B
Python
"""
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Problem:
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A palindromic number reads the same both ways. The largest palindrome made from
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the product of two 2-digit numbers is 9009 = 91 x 99.
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Find the largest palindrome made from the product of two 3-digit numbers which
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is less than N.
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"""
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def solution(n: int = 998001) -> int:
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"""Returns the largest palindrome made from the product of two 3-digit
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numbers which is less than n.
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>>> solution(20000)
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19591
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>>> solution(30000)
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29992
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>>> solution(40000)
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39893
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"""
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answer = 0
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for i in range(999, 99, -1): # 3 digit numbers range from 999 down to 100
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for j in range(999, 99, -1):
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product_string = str(i * j)
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if product_string == product_string[::-1] and i * j < n:
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answer = max(answer, i * j)
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return answer
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if __name__ == "__main__":
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print(solution(int(input().strip())))
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