I am a computer science sophomore doing a data structures and algorithms course. My professor said that insertion sort requires random access, while merge sort does not.
According to him, the insertion step in insertion sort requires random access. But can't it be implemented using sequential access in a linked list, going through each element, and as soon as you find that the element of the next node is more than the element you wish to insert, you squeeze that element after the current element (for ascending order list).
He is almost never wrong, but he also doesn't entertain doubts, due to which I'm forced to ask here. Please let me know. Thanks!