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Data Structures for Coding Interviews in Java

Solution: Reverse First k Elements of Queue

Understand how to reverse the first k elements of a queue using a stack to leverage its LIFO behavior. This lesson guides you through handling edge cases, reversing elements efficiently, and maintaining the queue's order, all implemented in Java. It also explains the time and space complexity to help you grasp the solution's efficiency.

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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}
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