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CMPH FAQ
- How do I define the ids of the keys?
- You don't. The ids will be assigned by the algorithm creating the minimal
perfect hash function. If the algorithm creates an **ordered** minimal
perfect hash function, the ids will be the indices of the keys in the
input. Otherwise, you have no guarantee of the distribution of the ids.
- Why I always get the error "Unable to create minimum perfect hashing function"?
- The algorithms do not guarantee that a minimal perfect hash function can
be created. In practice, it will always work if your input
is big enough (>100 keys).
The error is probably because you have duplicated
keys in the input. You must guarantee that the keys are unique in the
input. If you are using a UN*X based OS, try doing
``` #sort input.txt | uniq > input_uniq.txt
and run cmph with input_uniq.txt
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