---
title: "Meaning & Key Takeaway of: public class MergeBU { private static…"
description: "\"“public class MergeBU { private static Comparable[] aux; // auxiliary array for merges // See page 271 for merge() code. public static void sort(Compar..."
image: "https://sms4smile.com/quotes/i/ab9/robert-sedgewick-81232_technology_public-class-mergebu-private-static-comp_3206463.jpg"
---

#  public class MergeBU { private static Comparable\[\] aux; //…

![“public class MergeBU { private static Comparable[] aux; // auxiliary array for merges // See page 271 for merge() code. public static void sort(Comparable[] a) { // Do lg N passes of pairwise merges. int N = a.length; aux = new Comparable[N]; for (int sz = 1; sz < N; sz = sz+sz) // sz: subarray…” quote by Robert Sedgewick](https://sms4smile.com/quotes/i/ab9/robert-sedgewick-81232_technology_public-class-mergebu-private-static-comp_3206463.jpg)   [Download](https://sms4smile.com/quotes/i/ab9/robert-sedgewick-81232_technology_public-class-mergebu-private-static-comp_3206463.jpg) [Open image](https://sms4smile.com/quotes/i/ab9/robert-sedgewick-81232_technology_public-class-mergebu-private-static-comp_3206463.jpg)

> ““public class MergeBU { private static Comparable\[\] aux; // auxiliary array for merges // See page 271 for merge() code. public static void sort(Comparable\[\] a) { // Do lg N passes of pairwise merges. int N = a.length; aux = new Comparable\[N\]; for (int sz = 1; sz < N; sz = sz+sz) // sz: subarray size for (int lo = 0; lo < N-sz; lo += sz+sz) // lo: subarray index merge(a, lo, lo+sz-1, Math.min(lo+sz+sz-1, N-1)); } }””

[Robert Sedgewick](https://sms4smile.com/quotes/author/robert-sedgewick/)

## About This Quote

This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.

The code implements top‑down merge sort, repeatedly merging subarrays of doubling size using an auxiliary array.

**In simple terms:** Merge sort algorithm using auxiliary array.

Key Takeaway

Implement efficient sorting with merge sort.

Themes

algorithm sorting efficiency

Mood

technical educational

Type

instructional explanatory

When to use this quote

- software development
- educational material
- algorithm teaching

Key Concepts

divide and conquer recursion complexity analysis

Questions to Reflect On

- When is merge sort preferred over quicksort?
- How does array size affect performance?

A Different Perspective

Requires extra memory for auxiliary array.

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[Array Merges](https://sms4smile.com/quotes/about/array-merges-3487973/) [Class Mergebu](https://sms4smile.com/quotes/about/class-mergebu-5974188/) [Comparable Int](https://sms4smile.com/quotes/about/comparable-int-5974189/) [Mergebu Private](https://sms4smile.com/quotes/about/mergebu-private-5974191/) [Merges Int](https://sms4smile.com/quotes/about/merges-int-5974190/) [Technology](https://sms4smile.com/quotes/about/technology/)

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