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Imagine that we need to write a (key, value) dictionary for an application, with the requirements;...

Imagine that we need to write a (key, value) dictionary for an application, with the requirements;

  • The application needs to find a range of keys between two values x and y often, so this operation must be fast.
  • The same for finding the smallest key.
  • Lookup of a key must be O(log n) or better.

Which data structure is probably the best choice?

a hash table

an unsorted array

a balanced search tree

a heap

a linked list

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Answer #1 
Lookup of a key in a hash table be O(1)

a hash table

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