Recursion in computer science is a method of problem solving where the solution to a problem depends on solutions to smaller instances of the same problem.
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Recursive math expression eval
It has been very hard to use recursion, but I think that it made the code shorter and cleaner.
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Recursive way to find Inorder successor
So far I have attempted to find the inorder successor through recursion and it seems to be working right. Can someone review the below code and give suggestions.
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1answer
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Is this the best way to check sorting (in recursion) without loops?
Please let me know if there is a shorter way to do it again without any kind of loops. Recursion only.
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Print the nodes of binary tree column-wise, using recursion and iteration
I am trying to code for both recursive and iterative approach to a problem.
Below is a recursive code to print the nodes of binarytree column wise. Basically I have count of root as 0 and if I move ...
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3answers
106 views
Directory Snapshot
The following code creates a recursive backup of a directory in the form of interlinked HTML files, structured in the same form as the input directory.
It does not take the backup of the contents ...
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2answers
41 views
Forming combinations of a 16 bit binary number
I wrote this code to form combinations of a 16 bit binary number (I know it is in output is string format, but it is my goal to just print all possible 16 bit binary numbers). My question is, can this ...
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Recursive file copy function
I created this function and I'm unsure if it is sufficient for "real world use", because all code snippets on the net I found for recursive copy functions used functions like
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1answer
235 views
Arranging 8 queens on an 8x8 board
Print all the ways of arranging eight queens on an 8x8 board. Rules:
Queens should not share the same row, column, of any diagonal.
Any comment on my solution?
I didn't write unit tests but I ...
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2answers
80 views
A set of names and a request with asterisks
I have a set of names and a request with asterisks. An asterisk can be replaced with any letter.
For example, there is a set of names: hasad, ahmed, fizo. And there are a few sample requests: hasad, ...
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397 views
Non-recursive method for finding a ^ n
I am working on an interview question from Amazon Software. The particular question I am working on is "to write a program to find an."
Here is my recursive solution to this problem (in Java):
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2answers
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Using recursion to count nodes in a binary tree, test equality of linked lists, and find extrema of a linked list
I am working with a some small functions to test recursion. I am fairly new to Python and am wondering if there is a cleaner way to get the job done.
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1answer
57 views
Grid walk problem and solving it recursively
On CodeEval, there's a Grid Walk challenge:
There is a monkey which can walk around on a planar grid. The monkey can move one space at a time left, right, up or down. That is, from (x, y) the ...
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Recursive Brute-Force [closed]
I have to recursively solve the following problem, using a brute force approach:
Suppose two people, A and B, have an even number of ordered boxes, each with a given value. For example, ...
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Condensing code that generates Pascal's triangle
I recently started learning Java for a class and my teacher gave us an assignment in which we had to write up code which would print out the Pascal's triangle to an amount of rows decided by the user, ...
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2answers
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Given a digit sequence, print the possible decodings of the given digit sequence
Examples:
12 gives:
'AB' and 'L'
and
123 gives
'ABC', 'LC' and 'AW'
Here is my attempt:
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2answers
102 views
Recursive functions for sorting
I made a few recursive functions for learning purposes which do a variety of tasks. Here is my current and functioning code:
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4answers
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To understand what recursion is, you must first understand recursion
This is the second assignment for my CS2 course:
Write a recursive C++ function writeLine() that writes a character repeatedly to form a line of n ...
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1answer
103 views
Paint fill function
Implement the "paint fill" function of image editing programs: Given a
screen point and new color fill the surrounding area.
Any comments on the code below?
Time complexity: ...
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1answer
46 views
Find free username based on schema
Hopefully this is not too complicated. I have this code that will generate a username based on the pre-configured schema the admin types in. The fields they can use are:
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1answer
498 views
An Army of Ones
I've been practicing using recursion lately and thought this was a case where it would prove really useful, is this good use or is there some superior non-recursive way to go about it?
Challenge:
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1answer
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Find relative filenames recursively in Emacs
I have a set of directories. For each directory I have a set of relative file names. I would like to select any of these relative filenames using completion, and then later reconstruct the absolute ...
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4answers
452 views
Digital root recursive function
Haven't any experience writing recursive functions.(Generally tend to avoid them - not sure if that's a negative). What do you think about the following?
This is also my first time using JUnit, I'd ...
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1answer
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217 views
Tree structure with support for inorder and preorder traversal
I am learning Tree Data Structures and came up with this code for implementing basic Tree Node using class and performing various Tree based operations like Traversals and others. The code works ...
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0answers
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Optimize CSS Rule Dumper
I have written the following Tampermonkey/Greasemonkey script. I am trying to obtain a list of all CSS rules for a page; across all stylesheets. As of now, I am just iterating over everything. Is ...
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469 views
Recursive Java Red-Black Tree
I've made an attempt at a recursive Red-Black tree in Java. I realise that some of my code could be condensed but I tried to favour readability with this code as Red-Black trees can be somewhat ...
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1answer
62 views
How can I reduce this code javascript code so it's not as repetitve?
I have a function which goes through every name in an object. This object has an array parameter materials which holds other objects. Those objects have the same array parameter which hold more ...
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Spiral Scanning for matrix using recursion
I have written code for scanning an N x M matrix in spiral order using a recursive function.
It uses 5 parameters - including 2 extra variables:
call to keep ...
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Knight's Tour with Heuristics
When someone suggested that I solve Knight's Tour, I did so with heuristics and recursion.
It takes a lot of time to solve even a 8x8 board:
N-A1
N-C2
N-E1
...
N-E6
N-F4
Time ...
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3answers
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N-Queens - Brute force - bit by bit
A discussion in The 2nd Monitor made me realize I had never 'solved' the N-Queens problem. Additionally, as I read up on it, I realized that the 64-squares in a chess board would work well if ...
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1answer
235 views
Project Euler #14 — longest Collatz sequence
I was reading this question and realized that I didn't know Python well enough to critique the algorithm. So I wrote a Java solution instead, which is inappropriate for that question. Since there's ...
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2answers
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Parse a tree & return the various paths
Input:
{ 1: [2,3], 2:[4], 3: [5,6], 4:[6] }
Expected output:
[[1, 2, 4, 6], [1, 3, 5], [1, 3, 6]]
My Code:
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2answers
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Importing different type of files into Lists
I am using a recursive directory scan to find all objects inside a Unity3D project. After that, I wish to move all these files to a sorted List. Is there a cleaner ...
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1answer
142 views
A prime number sieve using recursion
Out of curiosity, I built a recursive Sieve of Eratosthenes in Python and I was wondering how it could be improved for efficiency and how it can improved to be aligned with python best practices.
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1answer
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'Tis the season for gift-wrapping
When reviewing a Graham scan convex hull algorithm implementation, I wrote the following function in an answer:
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AI for an online contest
I'm actually creating an AI for the online contest Vindinium. The fact is that's also an exam for my school because I'm going to have a note with that work.
I created an AI based on ants pheromones ...
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2answers
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My recursive parser is wet behind the ears (well, it's not DRY at least)
I have an issue opened on GitHub since mid-November, to refactor & DRY up the Rubberduck Parser module (the idea is to model the code in a VBA project or code ...
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4answers
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Calculating a specific entry in a Pascal’s triangle recursively
Our task was to calculate the entry of a Pascal’s triangle with a given row and column recursively. The triangle was specified in a way that the tip of the triangle is ...
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1answer
134 views
Rotate image 90 degree clockwise recursively
Previous question:
Rotate image 90 degree clockwise
In this code I have used tail recursive, which is bad. Time complexity is still \$O(N^2)\$, which is worse-case. The only good part is memory ...
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1answer
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Getting rid of extra test during initialization of loop/recursion
I'm reluctant to ask this question. My code below works, it's intelligible, and it seems reasonably efficient. It's just that there's a trivial, nitpicky issue that's driving me crazy. The function ...
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1answer
73 views
Create a tree recursivly
I want to create a Treeview in C# which will group file by prefix (here the prefix is a marked by the separator _). The following files should give this tree:
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2answers
174 views
Rotate an image (2D array) by 90 degrees recursively with low memory usage
I'm looking for comments on coding style, passing arguments, ...etc.
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1answer
67 views
Recursive functions
I am using the following code which recursively executes function findWpisInZone(), code works fine, I just wondering if there is any better way to do it in JS,
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2answers
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Object storing and retrieving using wildcard identifier
I'm writing an interpreter for a scripting language which allows objects to:
Have an alias
Be referenced using a wildcard
Contain child objects
Combination of all three above
For example:
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2
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1answer
48 views
Memoization for calculating minimal traversal distance within a positive matrix
The code below is for calculating the minimal traversing distance from the top left point of the matrix to the bottom right point of the matrix.
GitHub
Here is the core functionality. Please note ...
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AudioMetaTagger: recursively read files and gather metadata
So the idea is to read metadata recursively in a chosen directory, load their metadata and display it into a table.
Here is the simplified example of what I am doing.
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