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98e9d6bdb6
* Fix style of the first ten solutions for Project Euler - Unify the header docstring, and add reference URLs to wikipedia or similar - Fix docstrings to be properly multilined - Add newlines where appropriate - Add doctests where they were missing - Remove doctests that test for the correct solution - fix obvious spelling or grammar mistakes in comments and exception messages - Fix line endings to be UNIX. This makes two of the files seem to have changed completely - no functional changes in any of the solutions were done (except for the spelling fixes mentioned above) * Fix docstrings and main function as per Style Guide
83 lines
3.1 KiB
Python
83 lines
3.1 KiB
Python
"""
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Project Euler Problem 8: https://projecteuler.net/problem=8
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Largest product in a series
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The four adjacent digits in the 1000-digit number that have the greatest
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product are 9 × 9 × 8 × 9 = 5832.
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73167176531330624919225119674426574742355349194934
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96983520312774506326239578318016984801869478851843
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85861560789112949495459501737958331952853208805511
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12540698747158523863050715693290963295227443043557
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66896648950445244523161731856403098711121722383113
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62229893423380308135336276614282806444486645238749
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30358907296290491560440772390713810515859307960866
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70172427121883998797908792274921901699720888093776
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65727333001053367881220235421809751254540594752243
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52584907711670556013604839586446706324415722155397
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53697817977846174064955149290862569321978468622482
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83972241375657056057490261407972968652414535100474
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82166370484403199890008895243450658541227588666881
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16427171479924442928230863465674813919123162824586
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17866458359124566529476545682848912883142607690042
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24219022671055626321111109370544217506941658960408
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07198403850962455444362981230987879927244284909188
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84580156166097919133875499200524063689912560717606
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05886116467109405077541002256983155200055935729725
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71636269561882670428252483600823257530420752963450
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Find the thirteen adjacent digits in the 1000-digit number that have the
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greatest product. What is the value of this product?
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"""
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import sys
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N = """73167176531330624919225119674426574742355349194934\
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96983520312774506326239578318016984801869478851843\
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85861560789112949495459501737958331952853208805511\
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12540698747158523863050715693290963295227443043557\
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66896648950445244523161731856403098711121722383113\
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62229893423380308135336276614282806444486645238749\
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30358907296290491560440772390713810515859307960866\
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70172427121883998797908792274921901699720888093776\
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65727333001053367881220235421809751254540594752243\
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52584907711670556013604839586446706324415722155397\
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53697817977846174064955149290862569321978468622482\
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83972241375657056057490261407972968652414535100474\
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82166370484403199890008895243450658541227588666881\
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16427171479924442928230863465674813919123162824586\
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17866458359124566529476545682848912883142607690042\
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24219022671055626321111109370544217506941658960408\
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07198403850962455444362981230987879927244284909188\
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84580156166097919133875499200524063689912560717606\
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05886116467109405077541002256983155200055935729725\
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71636269561882670428252483600823257530420752963450"""
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def solution(n: str = N) -> int:
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"""
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Find the thirteen adjacent digits in the 1000-digit number n that have
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the greatest product and returns it.
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>>> solution("13978431290823798458352374")
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609638400
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>>> solution("13978431295823798458352374")
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2612736000
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>>> solution("1397843129582379841238352374")
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209018880
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"""
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largest_product = -sys.maxsize - 1
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for i in range(len(n) - 12):
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product = 1
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for j in range(13):
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product *= int(n[i + j])
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if product > largest_product:
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largest_product = product
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return largest_product
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if __name__ == "__main__":
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print(f"{solution() = }")
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