### Merge all the k linked-lists into one sorted linked-list and return it

### Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'

### Given two sorted arrays nums1 and nums2 of size `m` and `n` respectively, return the median of the two sorted arrays

### What are HTTP Status Codes? What purpose do they serve? Should I remember them all?

### What is Heap? How is Heap implemented? Why and where do we use Heap?