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# 输入一个数组,表示每种书买本书,例如 [1,2,0,0,0] 是第一集买一本、第二集买两本 | |
def book_price(order) | |
price = [0, 1 * 100, 0.95 * 200, 0.9 * 300, 0.8 * 400, 0.75 * 500 ] | |
order = order.reject{ |x| x <= 0 } | |
if order.size == 0 | |
return 0 | |
else | |
kind = order.count{ |x| x > 0 } | |
min_size = order.min | |
return book_price(order.map{ |x| x - min_size }) + (price[kind] * min_size) | |
end | |
end | |
describe "Book price" do | |
it [1,0,0,0,0] do | |
result = book_price([1,0,0,0,0]) | |
expect(result).to eq(100) | |
end | |
it [1,1,0,0,0] do | |
result = book_price([1,1,0,0,0]) | |
expect(result).to eq(190) | |
end | |
it [1,1,1,0,0] do | |
result = book_price([1,1,1,0,0]) | |
expect(result).to eq(270) | |
end | |
it [1,1,1,1,0] do | |
result = book_price([1,1,1,1,0]) | |
expect(result).to eq(320) | |
end | |
it [1,1,1,1,1] do | |
result = book_price([1,1,1,1,1]) | |
expect(result).to eq(375) | |
end | |
it [2,1,1,1,1] do | |
result = book_price([2,1,1,1,1]) | |
expect(result).to eq(475) | |
end | |
it [3,1,1,1,1] do | |
result = book_price([3,1,1,1,1]) | |
expect(result).to eq(575) | |
end | |
it [2,2,1,1,1] do | |
result = book_price([2,2,1,1,1]) | |
expect(result).to eq(565) | |
end | |
it [3,2,1,1,1] do | |
result = book_price([3,2,1,1,1]) | |
expect(result).to eq(665) | |
end | |
it [2,2,2,1,1] do | |
result = book_price([2,2,2,1,1]) | |
expect(result).to eq(645) | |
end | |
it [2,2,2,2,1] do | |
result = book_price([2,2,2,2,1]) | |
expect(result).to eq(695) | |
end | |
it [2,2,2,2,2] do | |
result = book_price([2,2,2,2,2]) | |
expect(result).to eq(750) | |
end | |
it [3,2,2,2,2] do | |
result = book_price([3,2,2,2,2]) | |
expect(result).to eq(850) | |
end | |
end |
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