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GeezerVison is showing github.com — codility/fish.rb at master · skillgrid/codility

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# http://codereview.stackexchange.com/a/34081
def solution(a, b)
flowing_down = []
survivors = 0
a.zip(b).each do |size, direction|
if direction == 0 # flowing upstream
if flowing_down.empty?
survivors += 1
else
# duel
while flowing_down.any?
if size > flowing_down.last
flowing_down.pop
else
break
end
survivors += 1 if flowing_down.empty?
end
end
else
flowing_down << size
end
end
survivors + flowing_down.size
end
require 'minitest/autorun'
class Tests < MiniTest::Unit::TestCase
def test_example_input
assert_equal 2, solution([4, 3, 2, 1, 5], [0, 1, 0, 0, 0])
end
end
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