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Implement Queue using Stacks Visualizer & Solution | Rulcode

227. Implement Queue using Stacks

Easy

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Example 1:

Input: operations = ["MyQueue", "push", "push", "peek", "pop", "empty"], args = [[], [1], [2], [], [], []]

Output: [null, null, null, 1, 1, false]

Explanation: 1. Initialize MyQueue. 2. Push 1: queue becomes [1]. 3. Push 2: queue becomes [1, 2]. 4. Peek: returns 1 (front element). `s1` had [1,2], `s2` became [2,1], so 1 is peeked. 5. Pop: removes 1, returns 1. Queue is now [2]. 6. Empty: returns false as queue contains [2].

Constraints:

Time Complexity

O(1)

Space Complexity

O(N)

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227. Implement Queue using Stacks

Easy

Topics

Companies

Hint

Understand Before Coding

Step 1 / 16

Speed: 1.0x

Implement Queue using Stacks

Conceptual Queue (FIFO)

Queue Empty

s1: Input Stack (push)

Empty

s2: Output Stack (pop/peek)

Empty

Commentary

Initialize two empty stacks: s1 (input stack) to record incoming elements, and s2 (output stack) to help reverse them for FIFO output.

Variables

s1[]

s2[]

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Example 1:

Input: operations = ["MyQueue", "push", "push", "peek", "pop", "empty"], args = [[], [1], [2], [], [], []]

Output: [null, null, null, 1, 1, false]

Constraints:

Time Complexity

O(1)

Space Complexity

O(N)

Step 1 / 16

Speed: 1.0x

Implement Queue using Stacks

Conceptual Queue (FIFO)

Queue Empty

s1: Input Stack (push)

Empty

s2: Output Stack (pop/peek)

Empty

Commentary

Initialize two empty stacks: s1 (input stack) to record incoming elements, and s2 (output stack) to help reverse them for FIFO output.

Variables

s1[]

s2[]

227. Implement Queue using Stacks

Understand Before Coding

Visualize This Problem

Draw Your Approach

Example 1:

Constraints:

Learn

Topics

Companies

Hint

Use Cases

227. Implement Queue using Stacks

Understand Before Coding

Implement Queue using Stacks

Conceptual Queue (FIFO)

s1: Input Stack (push)

s2: Output Stack (pop/peek)

Commentary

Variables

Visualize This Problem

Draw Your Approach

Example 1:

Constraints:

Learn

Topics

Companies

Hint

Use Cases

Implement Queue using Stacks

Conceptual Queue (FIFO)

s1: Input Stack (push)

s2: Output Stack (pop/peek)

Commentary

Variables