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10-liner: BrianMcleod's simplified solution in Clear category for Fast Train by przemyslaw.daniel
def fast_train(sections):
limit = sum([[y]*x for x, y in sections], [])+[0]
run = lambda x: sum([[y]*y for y in range(x, -1, -1)], [])
time, speed, pos = [0]*3
while pos < len(limit)-1:
speed += all(x <= y for x, y in zip(run(speed+1), limit[pos:])) + \
all(x <= y for x, y in zip(run(speed), limit[pos:])) - 1
pos += speed
time += 1
return time
Oct. 30, 2018
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