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菲力牛排

Filet Mignon

专题
Brainteaser / 脑筋急转弯
难度
L2

题目详情

你的烤架一次最多可容纳 3 块菲力牛排。牛排的一侧需要一分钟才能煮熟,而两面都必须煮熟才能被认为可以食用。煮 4 块菲力牛排需要多少分钟?

Your grill can hold a maximum of 3 pieces of Filet Mignon at a time. It takes one minute to cook one side of the steak and both sides must be cooked in order for it to be considered ready to eat. How many minutes will it take you to cook 4 pieces of Filet Mignon?

解析

我们将 AABBCCDD 表示为四个部分,并将 A1A_1A2A_2B1B_1B2B_2 ... D1D_1D2D_2 表示为它们的边。在第一分钟内,我们将敬酒 A1A_1B1B_1C1C_1,然后在第二分钟内,我们将敬酒 A2A_2B2B_2D1D_1。最后,在第三分钟,我们将为 C2C_2D2D_2 干杯。因此,煮四块牛排总共需要3分钟。


Original Explanation

Let's denote AA, BB, CC, DD to be the four pieces and we will denote A1A_1, A2A_2, B1B_1, B2B_2 ... D1D_1, D2D_2 to be their sides. During the first minute we will toast A1A_1, B1B_1, C1C_1 and then during the second minute we will toast A2A_2, B2B_2, D1D_1. Finally, during the third minute we will toast C2C_2 and D2D_2. Therefore, it will take 3 minutes in total to cook the four pieces of steak.