Chapter 23.4, Problem 23.4.3CP

What is wrong if lines 6–15 in Listing 23.6, MergeSort.java, are replaced by the following code?

// Merge sort the first half

int[] firstHalf = new int[list.length / 2 + 1];

System.arraycopy(list, 0, firstHalf, 0, list.length / 2 + 1);

mergeSort(firstHalf);

// Merge sort the second half

int secondHalfLength = list.length - list. length / 2 - 1;

int[] secondHalf = new int[secondHalfLength];

System.arraycopy(list, list.length / 2 + 1,

 secondHalf, 0, secondHalfLength);

mergeSort(secondHalf);