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Palantir Technologies

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Palantir Technologies interview question

Use a stack to implement a queue.

Interview Answers

Anonymous

Sep 10, 2012

/* Omitted Enqueue and other set up */ public E dequeue(Stacks) { if(s.size()==1) return s.pop() E tmp = s.pop(); E rez = popElem(s); s.push(tmp); return rez; }

Anonymous

Jan 3, 2015

The Roman's answer is almost good, if you remove the second copyElements call from dequeue then you get amortized O(1) time for both operations.