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# http://stackoverflow.com/a/7139391/233852

def triangle(a)

a.sort!

a.each_cons(3) do |a, b, c|

next if c <= 0

return 1 if a + b > c

end

require 'minitest/autorun'

class Tests < MiniTest::Unit::TestCase

def test_example_input

assert_equal 0, triangle([10, 50, 5, 1])

end

def test_success

assert_equal 1, triangle([10, 2, 5, 1, 8, 20])

end

def test_success2

assert_equal 1, triangle([10,0, -10, 2, 5,5, 1, 8, 20])

end

def test_large2

assert_equal 1, triangle([1] + 20.step(100_000, 2).to_a + [1, 5, 10])

end