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Good morning! Here's our prompt for today.

Building a Queue with Two Stacks: A Challenge in Engineering Elegance

The Objective: Queue with Stacks

In this challenge, your task is to implement a queue using two stacks. While many programming languages offer queues through arrays or lists, we're restricting our approach to only utilize stacks.

The end result should behave like this:

JAVASCRIPT
1const tsq = new TwoStackQueue();
2tsq.push(1);
3tsq.push(2);
4tsq.pop();  // Should return 1
5tsq.pop();  // Should return 2

The Blueprint: Visualizing the Mechanics

Imagine having two stacks that work in harmony to simulate a queue. These stacks are like two components of a complex machine, each with its own specific role.

Description

Constraints and Expectations

Let's clarify the rules of the game:

  • Number of Operations: The maximum number of operations won't exceed 100,000.
  • Value Ranges: The elements you push onto the stack will range between -1,000,000,000 and 1,000,000,000.
  • Time Complexity for Push: If the pop operation has a time complexity of O(n), then the push operation should be O(1). Otherwise, the time complexity for push should be O(n).
  • Time Complexity for Pop: If the push operation has a time complexity of O(n), then the pop operation should be O(1). Otherwise, it should be O(n).
  • Space Complexity: Expected to be O(n).

Try to solve this here or in Interactive Mode.

How do I practice this challenge?

JAVASCRIPT
OUTPUT
:001 > Cmd/Ctrl-Enter to run, Cmd/Ctrl-/ to comment

We'll now take you through what you need to know.

How do I use this guide?