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Google Software Engineer Interview Question

"Design a cache with O(1) search time and delete time."
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Part of a Software Engineer Interview Review - one of 3,037 Google Interview Reviews

Answers & Comments

of 1
Hash table has O(1) search time but it has O(n) delete time.
- Interview Candidate on Apr 10, 2014
of 0
1. keep two arrays - one for status and other for the hashtable
2. set all elements of status array to false
3. while adding elements, first check if status array for same element's hash is true or false. If false, add the element to hashtable array at element's hash. If true, add 1 to element's hash and add the element to hashtable array at this new index.
4. when delete, set hashtable[element's hash] = 0 and status[element's hash] = false;

search O(1) and delete O(1)
- Anonymous on Jul 28, 2014

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