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a5000d32ed
* Fix typehints in project_euler/problem01
Squashed commit of the following:
commit 6801d073b31bf702814861cd3b07b634ca295bfa
Author: Archaengel <god11341258@gmail.com>
Date: Mon Oct 5 16:40:10 2020 -0700
Fix typehints in project_euler/problem01
commit 29afc3af114abd1b99dc3f7c8fc99128229db131
Author: Archaengel <god11341258@gmail.com>
Date: Mon Oct 5 15:06:34 2020 -0700
Add typehints and default argument for project_euler/problem_01
* Add default args, typehints, and expand variable names for PE prob 02
* Add style improvements for first solution of PE Problem 02
* Add default arg and typehints for second solution of PE Problem 02
* Add default arg for third solution of PE Problem 02
* Add style improvements for 1st soln of PE problem 03
* Add default arg and typehints for 2nd soln of PE problem 03
* Add default arg for 3rd soln of PE problem 03
* Remove unnecessary newlines
* Remove unnecessary newlines
* Fix end of file for 2nd soln in PE problem 03
* Add style improvements to solutions for PE problem 04
* Restore original newlines in soln for PE problem 04
* Fix punctuation in docstring for PE problem 04
* Restore solution bodies for PE problem 04
* Expand variable names for 2nd soln of PE problem 04
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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