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7f04e5cd34
* spelling corrections * review * improved documentation, removed redundant variables, added testing * added type hint * camel case to snake case * spelling fix * review * python --> Python # it is a brand name, not a snake * explicit cast to int * spaces in int list * "!= None" to "is not None" * Update comb_sort.py * various spelling corrections in documentation & several variables naming conventions fix * + char in file name * import dependency - bug fix Co-authored-by: John Law <johnlaw.po@gmail.com>
33 lines
820 B
Python
33 lines
820 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):
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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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t = str(i * j)
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if t == t[::-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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