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31 lines
694 B
Ruby
31 lines
694 B
Ruby
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# @param {Integer[]} nums
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# @param {Integer} target
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# @return {Integer[]}
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def two_sum(nums, target)
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encountered = Hash.new
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nums.each_index { |i|
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complement = encountered.assoc(target - nums[i])
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if complement != nil then
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return [complement[1], i]
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else
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encountered[nums[i]] = i
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end
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}
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end
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RSpec.describe "two_sum from" do
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it "[2, 7, 11, 15] for 9 is [0, 1]" do
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expect(two_sum([2, 7, 11, 15], 9)).to eq([0, 1])
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end
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it "[3, 2, 4] for 6 is [1, 2]" do
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expect(two_sum([3, 2, 4], 6)).to eq([1, 2])
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end
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it "[3, 3] for 6 is [0, 1]" do
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expect(two_sum([3, 3], 6)).to eq([0, 1])
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end
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end
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