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* Added doctest and more explanation about Dijkstra execution. * tests were not passing with python2 due to missing __init__.py file at number_theory folder * Removed the dot at the beginning of the imported modules names because 'python3 -m doctest -v data_structures/hashing/*.py' and 'python3 -m doctest -v data_structures/stacks/*.py' were failing not finding hash_table.py and stack.py modules. * Moved global code to main scope and added doctest for project euler problems 1 to 14. * Added test case for negative input. * Changed N variable to do not use end of line scape because in case there is a space after it the script will break making it much more error prone. * Added problems description and doctests to the ones that were missing. Limited line length to 79 and executed python black over all scripts. * Changed the way files are loaded to support pytest call. * Added __init__.py to problems to make them modules and allow pytest execution. * Added project_euler folder to test units execution * Changed 'os.path.split(os.path.realpath(__file__))' to 'os.path.dirname()'
48 lines
939 B
Python
48 lines
939 B
Python
# -.- coding: latin-1 -.-
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"""
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Champernowne's constant
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Problem 40
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An irrational decimal fraction is created by concatenating the positive
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integers:
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0.123456789101112131415161718192021...
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It can be seen that the 12th digit of the fractional part is 1.
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If dn represents the nth digit of the fractional part, find the value of the
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following expression.
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d1 × d10 × d100 × d1000 × d10000 × d100000 × d1000000
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"""
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from __future__ import print_function
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def solution():
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"""Returns
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>>> solution()
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210
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"""
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constant = []
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i = 1
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while len(constant) < 1e6:
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constant.append(str(i))
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i += 1
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constant = "".join(constant)
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return (
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int(constant[0])
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* int(constant[9])
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* int(constant[99])
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* int(constant[999])
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* int(constant[9999])
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* int(constant[99999])
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* int(constant[999999])
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)
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if __name__ == "__main__":
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print(solution())
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