Challenge: Reverse First k Elements of Queue

Try to solve the Reverse First k Elements of Queue problem.

We'll cover the following

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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