Edit: I was looking at your use of getN() again and realized that you don't even need access to N. Just print out GRID_SIZE -- that should be the same as N anyway. If it isn't, then you'd have a bug. In general, invariance checking is not checking that stuff that are final ever change, it is that some construct emerging from changing variables, still holds. Wastefull: You will make two aray accesses every time. I am teaching myself to program by working my way through David Eck's Javanotes. What's more, since it has a wide scope of use, it should be more self documenting. Where should small utility programs store their preferences? How to write an effective developer resume: Advice from a hiring manager, “Question closed” notifications experiment results and graduation, MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, Review of java interface for constructing brain model, Menu Model class using Model-View-Presenter, Get the encrypted payload from an unencrypted wrapper PDF document. Is that the right thing to do? rev 2020.11.24.38066, The best answers are voted up and rise to the top, Code Review Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, @I'lladdcommentstomorrow well, not exactly (my bad). I don't immediately see any invariant worth checking. Maintain a byte array where the i th element stores data of the i th node/site in the WeightedQuickUnionUF object. Why is it easier to carry a person while spinning than not spinning? asked Apr 23 at 20:46. curio curio. connectSite(); Ken Austin wrote:So the private method would be a good place for an assert statement, rather than the bounds checking? The getter function numberOfOpenSites() should be named getNumberOfOpenSites(). And we can both read this tiny ad: Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop, current ranch time (not your local time) is, http://www.industriallogic.com/xp/refactoring/composeMethod.html, https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton, jTable cannot find symbol method delRow(int). If you have a crazy idea and it works, it's really valuable.—Kent Beck How to Ask Questions | How to Answer Questions | Format Your Code. "n" is accepted naming for a size variable or a counter, but if you use two, you defeat the consensus. All assertions are useless: your open, full, N and uf variables are final and can never be null (N can never be negative). You'll probably go for the easy win and extract the conditional expressions of the if statements but see what you can do to clarify and generalize the intent of the statements inside the if statements because those look like they could use a little DRYing out. Keystrokes don't count, readability matters! Why were there only 531 electoral votes in the US Presidential Election 2016? GitHub Gist: instantly share code, notes, and snippets. Specification Trying to do Algortihm Course Assignments.Finished it long time ago.So I don’t remember too much about the details. Also, since you won't be changing the value after it is initialized in the constructor, it might be a good idea to declare it as. Difficult to be sure, since the method is a confusing mass of. No definitions found in this file. It doesn't take much to make it unionFind. There's no "convenience" gained in writing 'getN()' vs. just 'N' or 'getGridSize()' vs just 'gridSize', if you follow my previous advice. I'm currently on Chapter 12 of 13. If you keep the N name, that might be a compelling reason to provide a better-named accessor like getSize() or getGridSize(), even if it only just returns the value of N directly. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Below is the syntax highlighted version of Percolation.java How to solve this puzzle of Martin Gardner? I noticed that you are doing bounds checking in a private method. Did genesis say the sky is made of water? We say the system percolates if there is a full site in the bottom row. Ken Austin wrote: I added isOutOfBounds(n) to the original. https://www.youtube.com/watch?v=xUWuZjadbbQ, Source code for WeightedQuickUnionUF: http://algs4.cs.princeton.edu/15uf/WeightedQuickUnionUF.java.html, [1] Reference: https://www.cs.princeton.edu/courses/archive/fall15/cos226/assignments/percolation.html. How to sustain this sedentary hunter-gatherer society? It's a subtle difference but since you are using 0==FULL and 1==OPEN, these are more naturally represented as boolean values. Why did MacOS Classic choose the colon as a path separator? java algorithm union-find. Below goes my implementation of Percolation: And below goes the implementation of JUnit test case for Percolation. How can I deal with claims of technical difficulties for an online exam? Code Review Stack Exchange is a question and answer site for peer programmer code reviews. MathJax reference. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Good reflex, but don't overdo it. Say you want to walk through a busy place like times square: gaps between the people do open and close all the time. Assertions must be put in place, not grouped in a method. this forum made possible by our volunteer staff, including ... Hey, friends. Any constructive feedback is very much welcome! Your submission may not call library functions except those in StdIn, StdOut, StdRandom, StdStats, WeightedQuickUnionUF, and java… Hey, friends. 1. Ken Austin wrote:I'm going to sleep on this one and try again in the morning.

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