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27 lines
511 B
Ruby
27 lines
511 B
Ruby
# @param {Integer} n
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# @return {Integer}
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def climb_stairs(n)
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possible_ways = [0, 1, 2]
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k = 3
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while possible_ways.size <= n do
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possible_ways.push(possible_ways[k - 1] + possible_ways[k - 2])
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k += 1
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end
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return possible_ways[n]
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end
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RSpec.describe "climb_stairs" do
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it "1 is 1" do
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expect(climb_stairs(1)).to eq(1)
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end
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it "2 is 2" do
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expect(climb_stairs(2)).to eq(2)
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end
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it "3 is 3" do
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expect(climb_stairs(3)).to eq(3)
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end
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end
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