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Sign upAdded a solution for Project Euler Problem 203 "Squarefree Binomial Coefficients" #3513
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project_euler/problem_203/sol1.py
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| coefficients = set() | ||
| previous_coefficients = [] | ||
| for step in range(1, depth + 1): | ||
| if step == 1: | ||
| coefficients.add(1) | ||
| previous_coefficients = [1] | ||
| else: | ||
| coefficients_begins_one = previous_coefficients + [0] | ||
| coefficients_ends_one = [0] + previous_coefficients | ||
| previous_coefficients = [] |
Comment on lines
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dhruvmanila
Oct 19, 2020
Member
Suggested change
coefficients = set()
previous_coefficients = []
for step in range(1, depth + 1):
if step == 1:
coefficients.add(1)
previous_coefficients = [1]
else:
coefficients_begins_one = previous_coefficients + [0]
coefficients_ends_one = [0] + previous_coefficients
previous_coefficients = []
coefficients = {1}
previous_coefficients = [1]
for step in range(2, depth + 1):
coefficients_begins_one = previous_coefficients + [0]
coefficients_ends_one = [0] + previous_coefficients
previous_coefficients = []
Please test whether this works or not.
Suggested change
| coefficients = set() | |
| previous_coefficients = [] | |
| for step in range(1, depth + 1): | |
| if step == 1: | |
| coefficients.add(1) | |
| previous_coefficients = [1] | |
| else: | |
| coefficients_begins_one = previous_coefficients + [0] | |
| coefficients_ends_one = [0] + previous_coefficients | |
| previous_coefficients = [] | |
| coefficients = {1} | |
| previous_coefficients = [1] | |
| for step in range(2, depth + 1): | |
| coefficients_begins_one = previous_coefficients + [0] | |
| coefficients_ends_one = [0] + previous_coefficients | |
| previous_coefficients = [] |
Please test whether this works or not.
fernandobperezm
Oct 19, 2020
•
Author
Tested locally and works. Also black, flake8 and doctests pass. Commit is already on the branch :-D
Tested locally and works. Also black, flake8 and doctests pass. Commit is already on the branch :-D
…ngle. Changes based on review suggestion.
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Describe your change:
Added a solution to Project Euler Problem 203 "Squarefree Binomial Coefficients" Link.
The solution is based on three main pilars.
d.2and the maximum coefficientCmaxusing a variant of the Sieve of Eratosthenes Link and considering that the square of each prime must be less or equal than thatCmax. The calculation returns the square of those primes.ninton = p * p * rwherepis a prime number calculated before andris a positive integer. If norcan be found for all squared primes, then the number is squarefree, else, the number is non-squarefree.After all unique squarefree numbers are calculated, they're summed-up to provide the final answer.
Checklist:
Fixes: #{$ISSUE_NO}.