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Data Structures for Coding Interviews in Java

Challenge: Implement Queue Using Stacks

Explore how to implement a queue using two stacks by designing enqueue and dequeue functions. This lesson helps you understand data structure manipulations essential for coding interviews, focusing on practical Java implementation and problem-solving using stacks and queues.

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Statement

Design a queue data structure using only two stacks and implement the following functions:

  • enqueue(int x): Inserts a value to the back of the queue.
  • dequeue(): Removes and returns the value from the front of the queue.

Constraints:

  • −105≤-10^5 \leq x ≤105\leq 10^5

Examples

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Try it yourself

Implement your solution in the following coding playground.

Note: You may use the custom MyStack class provided in the code to simulate a stack.

Java
usercode > Solution.java
class QueueWithStack {
    public QueueWithStack(int maxSize) {
        // Write your code here
    }
    public void enqueue(int value) {
        // Write your code here
    }
    public int dequeue() {
        // Replace this placeholder return statement with your code
        return -1;
    }
}
Implement Queue Using Stacks