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math.gcd solution in Clear category for Evenly Spaced Trees by rossras
from typing import List
from math import gcd
from functools import reduce
def evenly_spaced_trees(trees: List[int]) -> int:
first, last = trees[0], trees[-1]
dists = (t-first for t in trees)
step = reduce(gcd, dists)
return (last-first)//step + 1 - len(trees)
if __name__ == '__main__':
print("Example:")
print(evenly_spaced_trees([0, 2, 6]))
assert evenly_spaced_trees([0, 2, 6]) == 1, 'add 1'
assert evenly_spaced_trees([1, 3, 6]) == 3, 'add 3'
assert evenly_spaced_trees([0, 2, 4]) == 0, 'no add'
print("Coding complete? Click 'Check' to earn cool rewards!")
Feb. 13, 2020
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