Multiway Merge Sort
Multiway Merge Sort Multiway merge sort generalizes merge sort by splitting the input into $k$ parts instead of two, and merging $k$ sorted sequences at each step. It is especially useful when merging cost dominates, such as in external memory or database systems. Problem Given an array $A$ of length $n$, reorder it such that: $$ A[0] \le A[1] \le \dots \le A[n-1] $$ Idea Instead of binary splitting: $$...