An Enormous Chocolate Bar

Geoff has bought a Jumbo Chocolate Bar from a shop today. The size of this bar is 2 blocks by 1009 blocks. He decides that he wants to break the bar up into individual blocks.

Given that he can split only one chocolate piece into smaller pieces at a time, what is the minimum number of splits are required to break the bar up into individual blocks?


The answer is 2017.

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1 solution

Sharky Kesa
Jan 29, 2017

Notice that each split increases the number of pieces of chocolate by 1. Since we start at 1 piece and end with 2 × 1009 = 2018 2\times 1009 = 2018 pieces, we must require 2017 splits to break the bar down, and any method of splitting will be able to do this successfully in the 2017 splits.

Hey, nice problem... But, how did you know I like chocolate so much? :0)

Geoff Pilling - 4 years, 4 months ago

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Everyone likes chocolate. :P

Sharky Kesa - 4 years, 4 months ago

But how could you show this is minimun?

Vishal Yadav - 4 years, 3 months ago

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I have just shown that this is the minimum. In fact, no matter how you cut the blocks, it always takes the same number of splits to break.

Sharky Kesa - 4 years, 3 months ago

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