Question: Now, let's elevate the complexity a bit. Imagine you have k sorted lists with n elements in total. Your task is to merge these k

Now, let's elevate the complexity a bit. Imagine you have k sorted lists with n elements in total.
Your task is to merge these k sorted lists into one single sorted list efficiently.
Here's the challenge: Your algorithm should accomplish this in O() time complexity. I'll
offer a hint: use a heap for k-way merging.

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