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Thoughts. - Think in order from smallest to largest
- When the number is two, subtract the smaller one from the larger one.
- What about when there are three?
- c-(a-b) is in essence c-a+b
- That is, N/2 units are negative.
- Then we can sort and set the smaller half to negative.
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Official Explanation
- You’re missing (a-b)-c when you have three.
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