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Show how to implement a stack using two queues. Analyze the running time of the stack operations.
in Algorithms by Boss (41.9k points) | 69 views

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we take two QUEUE say A and B we push all the element in A.i.e A={1,2,3,4,5} then here first element is 1=head and 5=tail .we know that stack follow LIFO policy.now dequeue n-1 element and place into QUEUE B then there is only one element in A so we can pop it .for push operation it will take o(1) time for pop operation it will take o(n) time .NOTE- here  o(n) popoperation is for single element. 

by Active (2.8k points)

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