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Data Structures for Coding Interviews in Java

Challenge: Reverse First k Elements of Queue

Explore how to reverse the first k elements of a queue in Java, managing edge cases where k is invalid or exceeds queue size. Understand queue operations and practice coding solutions to strengthen your implementation skills.

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Statement

Given a queue and a number k, reverse the order of the first k elements in queue. If k is less than 00, if k exceeds queue size, or if queue is empty, return NULL. Otherwise, return the modified queue.

Constraints:

  • 0≤0 \leq queue.length ≤103\leq 10^{3}
  • 10−3≤10^{-3} \leq queue[i] ≤103\leq 10^{3}
  • 10−3≤10^{-3} \leq k ≤103\leq 10^{3}

Examples

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Try it yourself

Implement your solution in the following coding playground.

Java
usercode > Solution.java
class Solution {
    public static MyQueue<Integer> reverseK(MyQueue<Integer> queue, int k) {
        
        // Replace this placeholder return statement with your code
        return queue;
    }
}
Reverse First k Elements of Queue