Barbie is trying to implement a branch-and-bound algorithm to determine the best sleepover schedule, but she isn't making any progress.

"I just don't know how to structure the algorithm - there are so many ways I could go about it!" says Barbie.

"Have you worked out your loop invariants?" asked Skipper. "Once you've determined your loop invariants, the code writes itself!"

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      Barbie is trying to implement a branch-and-bound algorithm to determine the best sleepover schedule, but she isn't making any progress.

"I just don't know how to structure the algorithm - there are so many ways I could go about it!" says Barbie.

"Have you worked out your loop invariants?" asked Skipper. "Once you've determined your loop invariants, the code writes itself!"