Introduction - If you have any usage issues, please Google them yourself
Merge sort, using a typical application of divide and conquer method. The main steps can be simply described as: [] The first step in ascending order: the array is divided into left and right arrays, then recursively until around the array contains only a single element [bottom] Step Two: Start from a single element, merge array, making the value of a small layer on the left side of the array, the value in the right layer of the large array, and then recursively until the top level to the original array [].