algs4 | Algorithms , 4th edition textbook code and libraries | Learning library
kandi X-RAY | algs4 Summary
kandi X-RAY | algs4 Summary
Algorithms, 4th edition textbook code and libraries
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Top functions reviewed by kandi - BETA
- Test the unit test
- Place a key - value pair into symbol table
- Returns the value associated with the given key
- Removes a symbol from the symbol table
- Test a unit test
- Removes a key from the set
- Adds a key to the set
- Test for unit tests
- Reads the next character from the input stream
- Entry point for the indexMaxPQ
- Prints Interval1D
- Verifies the solution is feasible
- Creates a new DAG
- Creates a Topological X
- Test data type
- Main method
- Reads the segment tree
- Checks the optimisation conditions
- Augments the augmenting path
- Checks that the graph is valid
- Test the unit tests
- Test program
- Test for a Gauss model
- Demonstrates how to test the FloydW marshall algorithm
- Test to unit tests
- Creates a random digraph with strong components
algs4 Key Features
algs4 Examples and Code Snippets
private int getRGBColor(int x, int y, int channel) {
return pic[xyTo1D(x, y)] >> channel & 0xFF;
}
Community Discussions
Trending Discussions on algs4
QUESTION
I'm trying to run a Java class file which I've compiled, but it keeps telling me that it cannot find or load the main class.
I have a directory which looks like this:
My goal is to run the RandomWord.java file, which takes in a file input and relies on the algs4.jar file found in the .lift sub-directory.
From what I've seen, to compile, I need to run the following (assuming I'm cd'ed into the hello directory):
$ javac -cp .lift/algs4.jar RandomWord.java
This should create my RandomWord.class file.
Now, to run it with a txt file, for example with coin.txt, I believe I should be running the following:
$ java -cp .lift/algs4.jar RandomWord < coin.txt
However, this results in an error stating: Error: Could not find or load main class RandomWord.
I've done a ton of experimenting with this but I have no idea what's going on, but I've found that running the following works:
$ java -cp .lift/algs4.jar RandomWord.java < coin.txt
However, I believe when a .class file is created, I shouldn't be writing .java in my command line, so I'm really confused.
ANSWER
Answered 2021-Oct-24 at 16:08Windows:
QUESTION
I am trying to check whether my levelorder of my Binary Search Tree is equal to the other one. To do this, I tried to make a compareTo method. I only give equal values to the method, but it keeps on saying the condition is false. When I place breakpoints, I see that the values are still equal. I am probably not understanding it correctly. Does anyone know how to solve this?
Here is what I did, as you can see below, the compareTo returns a 1 instead of a 0:
...ANSWER
Answered 2021-Mar-28 at 15:47When you're using the ==
operator you're actually checking to see if the references point to the same object in memory. From your debugging screenshot you can see that they are not. this.e
points to object Queue@817
while o.e
points to Queue@819
.
QUESTION
I have this method that prints my permutations of a Set I'm giving with my parameters. But I need to save them in 2 separate sets and compare them. So, for instance I have [5,6,3,1] and [5,6,1,3], by adding them in two separate BST, I can compare them by using the compareTo function to check whether their level order is the same. But I am having trouble with saving these permutations from my method into a set in my main. Does anyone know how to save these into a set?
What I have now:
...ANSWER
Answered 2021-Mar-27 at 22:55I'm not sure if I understood your idea but maybe this will help:
Yours combos
method will return set of all permutations (as Stacks)
QUESTION
I used the percolation class from the algs4.jar library, where you can simulate a whole labyrinth and see where the leaks are. I want to show the leaks that are from top to bottom, but now I get to see all of the leaks.
Does anyone know how I can see only the leaks that are percolations?
I thought maybe using dfs from the flow method in de Percolation.java class, and say something like only show when index i in rows is maxlength and marked but I don't really know how to say that, because I am not sure if this statement will show the entire leak of just the max length leak.
code I run AssignmentTwo.java:
...ANSWER
Answered 2021-Feb-02 at 16:19It seems that disabling double buffering will get you the result you want:
QUESTION
I would like to count how many edges there are that goes between a white and a red node. The red nodes are the ones in the new int[] in the main method.
Provided code for the assignment:
...ANSWER
Answered 2020-Oct-07 at 19:14To be fair I code in C++, not java, but here's a question: Why does your marked()
function return the value of a marked
array? Wouldn't it make more sense to use that array directly?
For the time being I can tell you are using a DFS to traverse the graph correctly. I am not sure, however, why you are traversing the graph at all.
I am sorry, but this is going to be one of these "don't do this, do that instead" answers.
If you are looking for a linear solution (for one execution of the count method), you better just create an array which, for each node holds info about whether it is white or red. I'd recommend filling it with zeroes, and then going over the rednodes
array to change appropriate values to 1
.
Next, you declare a result variable equal to zero, which will count the number of edges which connect to nodes of different colours. You iterate over all the edges, and check if the vertices they connect are of varying colours. If so, increment the result variable.
QUESTION
Am trying to incorporate some C# code into my PowerShell, as I am still learning C# and getting a foothold on learning a new language.
I am able to open a file locally on my computer and read it line by line. But cannot seem to work out how to open a file from the internet and parse it line by line.
This works to read the file line by line, and allows me to take action on the line items in the loop.
...ANSWER
Answered 2020-Jul-06 at 16:20Actually, I found a working solution.
I was re-reading and testing before posting this question, I came up with a method to solve my own predicament. In the event anyone else is interested, here is the solution:
QUESTION
I'm currently working on Robert Sedgewicks Algorithm's book. I'm trying to implement Heap sort but I'm coming across an error
'sink': undefined method >' for nil:NilClass
This error happens because of the when the array is pass to the sort
method it has 11 elements at 0 index. when it swaps index n
(the number of elements in the array) with 1 is comparing nil
with a string. Meaning n
is 11 but there is no 11 index because the array index starts at 0.
Here is the Java implementation for the Heap sort method in the book:
...ANSWER
Answered 2020-Sep-01 at 12:37The error was coming from the following line:
QUESTION
I can really use some help with this parameterized test case I am trying to create. No matter what kind of constructor I create the IDE gives an error message. Here is my code:
...ANSWER
Answered 2020-Jul-14 at 02:11QUESTION
When I'm running java -cp foo.jar MyClass
I keep getting the error:
ANSWER
Answered 2020-Jun-18 at 20:33Your problem is that when you include the -cp option you are overriding the class path.
So if your .class file is in the current path you must write:
QUESTION
I am reading "Algorithms 4th Edition" by Robert Sedgewick and Kevin Wayne.
The following code is my answer for the exercise 1.2.9 on p.115.
I expect this code prints the total number of keys examined during all searches but this code doesn't print the value of the counter.
Why?
...ANSWER
Answered 2020-Jun-06 at 13:58StdIn
will never be empty. It's your keyboard, it can only be waiting for your input. You need to add something to end the loop, such as the user entering some specific key, like q
or some other key that won't affect the function of the rest of your program.
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