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15 lines
284 B
Ruby
15 lines
284 B
Ruby
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def reverse_list(list)
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(list.length >> 1).times do |i|
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last_index = list.length - i - 1
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list[i], list[last_index] = list[last_index], list[i]
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end
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end
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N = 20000000
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list = (0...N).to_a
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start = Time.now
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reverse_list(list)
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puts "elapsed: " + (Time.now - start).to_s + ' s'
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