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Implement A Queue Using Stacks - The Queue ADT ('Implement Queue Using Stacks' on LeetCode)
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Question: Implement a queue (a FIFO structure...first-in-first-out) only using stacks internally as efficiently as possible.
This problem is classic and well known but as always, I want to walk you through the thought process and not just present the solution.
Complexities
n is the total items between the 2 stacks (in the overarching queue)
Time: O( 1 ) - amortized (for enqueue and dequeue operations)
Space: O( n )
We upper bound space to the maximum amount of items that we will ever store.
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++++++++++++++++++++++++++++++++++++++++++++++++++
This question is number 19.1 in "Elements of Programming Interviews" by Adnan Aziz, Tsung-Hsien Lee, and Amit Prakash.
🏃 Run Code As You Learn
💾 Save Progress
❓New Unseen Questions
🔎 Get All Solutions
Question: Implement a queue (a FIFO structure...first-in-first-out) only using stacks internally as efficiently as possible.
This problem is classic and well known but as always, I want to walk you through the thought process and not just present the solution.
Complexities
n is the total items between the 2 stacks (in the overarching queue)
Time: O( 1 ) - amortized (for enqueue and dequeue operations)
Space: O( n )
We upper bound space to the maximum amount of items that we will ever store.
++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++
This question is number 19.1 in "Elements of Programming Interviews" by Adnan Aziz, Tsung-Hsien Lee, and Amit Prakash.
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