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Data Structures for Coding Interviews in C++

Challenge: Reverse First k Elements of Queue

Explore how to reverse the first k elements in a queue with boundary validation. Understand queue manipulation techniques and practice implementing this efficiently in C++ for coding interviews.

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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.

C++
usercode > reverseElements.cpp
MyQueue<int> ReverseK(MyQueue<int> queue, int k) {
    // Replace this placeholder return statement with your code
    return queue;
}
Reverse First k Elements of Queue