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28 lines
654 B
Ruby
28 lines
654 B
Ruby
# @param {Integer[]} cost
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# @return {Integer}
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def min_cost_climbing_stairs(cost)
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def get(cost, k)
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if k < 0 || k >= cost.size then
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return 0
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end
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return cost[k]
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end
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i = cost.size - 1
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while i >= 0 do
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cost[i] += [get(cost, i + 1), get(cost, i + 2)].min
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i -= 1
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end
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return cost.take(2).min
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end
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RSpec.describe "min_cost_climbing_stairs" do
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it "of [10,15,20] is 15" do
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expect(min_cost_climbing_stairs([10,15,20])).to eq(15)
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end
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it "of [1,100,1,1,1,100,1,1,100,1] is 6" do
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expect(min_cost_climbing_stairs([1,100,1,1,1,100,1,1,100,1])).to eq(6)
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end
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end
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