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First solution in Clear category for Changing direction by gyahun_dash
from itertools import pairwise, groupby
def changing_direction(elements: list[int]) -> int:
if len(elements) == 1:
return 0
cmps = ((a > b) - (a < b) for a, b in pairwise(elements))
return sum(abs(k) for k, g in groupby(cmps)) - 1
Nov. 23, 2023
