226. Implement Stack using Queues

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Implement Stack using Queues

Actual Single Queue (FIFO)

Queue Empty

Conceptual Stack (LIFO)

Stack Empty

Commentary

Initialize an empty queue 'q' which will be used to simulate LIFO behavior.

Variables

q[]

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Example 1:

Input: Operations = ["MyStack", "push", "push", "top", "pop", "empty"], Arguments = [[], [1], [2], [], [], []]

Output: [null, null, null, 2, 2, false]

Explanation:

MyStack myStack = new MyStack(); - Initializes an empty stack.
myStack.push(1); - Stack: [1] (queue: [1])
myStack.push(2); - Stack: [1, 2] (queue: [1, 2])
myStack.top(); - Returns 2. (queue: [1, 2])
myStack.pop(); - Removes 2, returns 2. (queue: [1])
myStack.empty(); - Returns false.

Constraints:

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Time Complexity

push(x): O(1) pop(): O(N) top(): O(1) empty(): O(1)

Space Complexity

N/A

226. Implement Stack using Queues

Understand Before Coding

Visualize This Problem

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Example 1:

Constraints:

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226. Implement Stack using Queues

Understand Before Coding

Implement Stack using Queues

Actual Single Queue (FIFO)

Conceptual Stack (LIFO)

Commentary

Variables

Visualize This Problem

Draw Your Approach

Example 1:

Constraints:

Learn

Topics

Companies

Hint

Use Cases

Implement Stack using Queues

Actual Single Queue (FIFO)

Conceptual Stack (LIFO)

Commentary

Variables