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The problem set for Week 5 will challenge you to apply what you've learned about pointers, memory management, file i/o and structs, creating more complex data structures (such as Hash Tables or Tries) and leveraging their power to write a lightning-fast spell check algorithm.

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What Does __attribute__((__packed__)) Do?

This basically answers all 3 questions, but I'd like to mention why pset5 uses it. …
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