Hash Functions and Extraction
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Questions and Answers

What is the search complexity if the index can be instantaneously derived from the object key?

  • O(n^2)
  • O(n)
  • O(lg n)
  • O(1) (correct)

    • What is the main purpose of a hash function?

  • To compute the table index from the key (correct)
  • To delete a specific key
  • To search for a specific key
  • To sort the data

    • What is the ideal property of a hash function?

  • It must be easy to calculate (correct)
  • Each index is more likely to be generated for each key
  • It must be difficult to calculate
  • It must always generate the same index for each key

    • What is the name of the data structure that uses a hash function to map keys to indexes associated with values?

    <p>Hash table</p> Signup and view all the answers

    What is the name of the technique that instantly calculates the index of the object?

    <p>Hashing</p> Signup and view all the answers

    What is the name of the ideal hash function that generates a different hash value for each key?

    <p>Perfect hash function</p> Signup and view all the answers

    What is the advantage of using a hash table?

    <p>It allows for fast search, insert, and delete operations</p> Signup and view all the answers

    What is the worst-case search complexity for an unsorted array?

    <p>O(n)</p> Signup and view all the answers

    What is the average-case search complexity for a sorted array?

    <p>O(lg n)</p> Signup and view all the answers

    What is the best-case search complexity for a hash table?

    <p>O(1)</p> Signup and view all the answers

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