A map's keys must be of a type that is _____

  • Comparable
  • Comparable and Hashable
  • Hashable
  • None of the above
A map's keys must be of a type that is both Comparable and Hashable. This requirement ensures that keys can be compared for equality and that they can be efficiently stored and retrieved from the underlying data structure. Comparable keys are necessary for searching and indexing, while Hashable keys allow for efficient lookup in the map. Failing to use keys of a compatible type can lead to unexpected behavior in map-based data structures.
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