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There are only 1 hard problems in computer science: memoization and ... shoot what was it again?

There are only 2 hard problems in computer science:

1. Naming things

2. Memori^H^Hdamn it^H^H^H^H^H^H^Hization.

P.S. I see what you did there. You botched your cache invalidation, and so lost the answer.

3. Off-by-1 errors

Segmentation fault