Interview Question

Software Engineer Interview

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Google

Design a cache with O(1) search time and delete time.

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2 Answers

1

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)

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1

Hash table has O(1) search time but it has O(n) delete time.

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