mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-21 02:30:15 +00:00
4700297b3e
* Enable ruff RUF002 rule * Fix --------- Co-authored-by: Christian Clauss <cclauss@me.com>
40 lines
1001 B
Python
40 lines
1001 B
Python
"""
|
|
Project Euler Problem 4: https://projecteuler.net/problem=4
|
|
|
|
Largest palindrome product
|
|
|
|
A palindromic number reads the same both ways. The largest palindrome made
|
|
from the product of two 2-digit numbers is 9009 = 91 x 99.
|
|
|
|
Find the largest palindrome made from the product of two 3-digit numbers.
|
|
|
|
References:
|
|
- https://en.wikipedia.org/wiki/Palindromic_number
|
|
"""
|
|
|
|
|
|
def solution(n: int = 998001) -> int:
|
|
"""
|
|
Returns the largest palindrome made from the product of two 3-digit
|
|
numbers which is less than n.
|
|
|
|
>>> solution(20000)
|
|
19591
|
|
>>> solution(30000)
|
|
29992
|
|
>>> solution(40000)
|
|
39893
|
|
"""
|
|
|
|
answer = 0
|
|
for i in range(999, 99, -1): # 3 digit numbers range from 999 down to 100
|
|
for j in range(999, 99, -1):
|
|
product_string = str(i * j)
|
|
if product_string == product_string[::-1] and i * j < n:
|
|
answer = max(answer, i * j)
|
|
return answer
|
|
|
|
|
|
if __name__ == "__main__":
|
|
print(f"{solution() = }")
|