Questions tagged [recursion]
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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Solving the game of 24 recursively in APL
The "game of 24" as I called it in the title is a maths game in which you are given four numbers and have to combine them in an expression using only the four basic arithmetic operations <...
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Best way to store the sum of all node depths?
To sum up all the nodes' depths in any given binary tree, I've written the following recursive algorithm:
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1answer
34 views
Recursive Function to Produce Constrained List of Integer Partitions
I have modified a recursive function designed to print all the integer partitions of a positive integer to create a function that returns all partitions of the "number" parameter if they ...
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1answer
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1answer
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Recursively displaying json data on website [closed]
I am displaying the data from a json file onto a website, with recursive and iterative tables side by side. i have the iterative code working, but I have no idea on how to make it recursive.
Here is ...
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1answer
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How to merge two descending singly linkedlist into one ascending linkedlist using Recursion without any helper method?
Here is my solution:
I want to know if my solution fits the requirement 100%? Or if there is any better solution?
Constraint of the question:
must be singly linkedlist
must use recursion, and no ...
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1answer
42 views
Recursive Matrix Multiplication Algorithm
Can I improve on this any further. Is there a prettier way of passing the array sizes?
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1answer
87 views
Minimax based Tic Tac Toe
I am attempting to make an unbeatable Tic Tac Toe game using a simplified minimax algorithm. The code looks like this:
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2
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1answer
34 views
What is the most optimal way to concat XML files as one large string/text file?
Python3 - Recursive XML Files to Large Text File
I have a recursive function that looks through a directory (there are 6000+ files).
For each XML file found - the ...
4
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2answers
107 views
How to optimize Karatsuba algorithm (using arraylist and java)
I was using Karatsuba algorithm to multiply two polynomials and return the coefficients and I am using java, we are asked to use arraylists here, however, my code is too complicated and it takes much ...
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0answers
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Noughts and Crosses Terminal Game with AI
I created a game which can play tic-tac-toe with: 0 players (AI vs AI), 1 player (human vs AI) or 2 player (human vs human).
Here is the AI function which wraps around my innermost function. This ...
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2answers
57 views
Recursive brute-force approach to maximum points you can obtain from cards
I came across this question on Leetcode. The question description is as follows:
There are several cards arranged in a row, and each card has an associated number of points.
The points are given in ...
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0answers
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Delete a linked list using recursion in Python
Given a Singly Linked-List, write a function to delete the linked list recursively.
Below is my attempt.
I am confused if I should use del keyword to delete the nodes or below method is better. I don'...
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1answer
37 views
Recursive function with Promise and setTimeout to ping DOM
I use this function in browser automation. It pings the document in the browser to check if an element we are looking for is available (useful when there is JavaScript generated async content). If it'...
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2answers
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Max Contiguous Subarray: Divide and Conquer
I am conversant with Kadane's Algorithm. This is just an exercise in understanding divide and conquer as a technique.
Find the maximum sum over all subarrays of ...
4
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2answers
119 views
Traveling salesman to find beer types from breweries
I am writing a modified travelling salesman problem recursively in Python 3.7. It has to find the best path around breweries to find the most beer types and not to exceed the ...
2
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1answer
50 views
recursive file search, C , linux
hi guys this script recursively searches for files with a certain extension and possibly in a directory passed by the terminal ....(In case no directory has been passed, search from the current one) I ...
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1answer
34 views
Recursive os.scandir() for copying/moving files preserving subdirectories
This is modified from the general recursive solution here: https://stackoverflow.com/a/54544211/42346 to, more specifically, copy/move files with a given extension from one directory to another whilst ...
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1answer
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Finding The Largest Digit in a Number using a Recursive Function in Python [closed]
I tried it using the code given below.
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1answer
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Speeding up a recursive Cantor pairing function
The Cantor Pairing function is a mathematical function which takes two integers and combines them into a single integer that is unique to that pair. This single integer can later be "unpaired" back ...
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1answer
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Time and Space Complexity of Leetcode Problem #31. Next Permutation
The question is as follows: Given a collection of distinct integers, return all possible permutations. Example:
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1answer
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How to convert Recursive Approach to iterative one(Super Reduced String)? [closed]
The Question:
Steve has a string of lowercase characters in range ascii[‘a’..’z’]. He wants to reduce the string to its shortest length by doing a series of operations. In each operation he selects a ...
4
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2answers
751 views
Recursive vs. non-recursive implementations of Fibonacci sequence
I have 2 functions to get the n-th fibonacci number. The 1st one uses recursive calls to calculate the power(M, n), while the 2nd function uses iterative approach for power(M, n). Theoretically (at ...
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0answers
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Simulating the orbits of the Earth, Moon and Sun together in Fortran
This has been racking my brain for hours now. I will try to explain as much as I can. I'm aware this code is horrendously ungraceful, but I'm new to Fortran and making things more efficient is not ...
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0answers
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Recursion - Max of integers in slice
Logical processors available on my machine:
CPU(s): 4
Thread(s) per core: 2
So, 2x4 = 8 logical processors. But am currently using only 4 go-...
2
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1answer
126 views
JavaScript Sudoku Recursive Solver
Thanks for all the great feedback in Part 1. I implemented a lot of it. Here is version 2. I am looking for feedback on:
Recursive solve algorithm. It's too slow. I used Chrome DevTools Performance ...
3
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0answers
108 views
N-Queens Puzzle
The N-Queens puzzle can be solved in many ways. One is by a depth-first-search backtracking algorithm.
Below is my generalized version using mutual recursion:
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2answers
52 views
Function for iterating out an unordered list of custom taxonomy terms
I've created a function that generates an <ul> of my wordpress custom taxonomy terms, displaying ...
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3answers
96 views
Counting the number of digits with a recursion algorithm in c
I'm learning recursion and I think that I can finally wrap my head around it.
I had to write a program that given an integer would print out its number of digits and I wanted to know if it is ...
4
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1answer
61 views
Recursively Convert Roman Number to Integer
I'm practicing recursive functions and I would be glad to receive some feedback for the following Python code I wrote. I did several tests and the function yielded correct results but I wonder if it ...
4
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2answers
108 views
Sudoku solver recursive backtrack in Java
I am implementing recursive backtracking algorithm for sudoku. Below is the code to create board with random filling. I wonder if I can make it better in any terms of readable coding especially ...
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1answer
34 views
DFS with recursion and without stack
this is my code to implement DFS with recursion but no stack. I ran few test cases which turned out to be positive but wanted to check the efficiency of the code.
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2
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2answers
131 views
“Smart” sudoku brute-forcer
After running my C-brute-forcer for two days on a 25x25 sudoku, I decided to re-write in Java so that it would solve it in an acceptable time frame. The idea: Make smart fields that contain all ...
3
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1answer
61 views
Longest Substring without Repeating Characters Problem - Kotlin Recursion
I am practicing coding questions on leetcode. I have been an OOP my whole career, and I am trying to wade into the dark abyss that is functional programming. So I am trying to do things purely ...
3
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2answers
519 views
Permutations with replacement in Python
Many a times, I've had the need to use a permutations with replacement function.
So, I've written a function to do just that:
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2
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0answers
148 views
generic implementation approaches for a recursive function
Let's take the famous fibonacci problem as an example but this is a generic problem. Also, taking scala as the language as it's rather feature-rich. I want to know which solution you'd prefer.
we all ...
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1answer
137 views
Factorial number in Rust for learning purposes
I'm currently trying to learn the basics of the Rust programming language, to do this my first piece of code after the classic 'Hello World' was a simple recursive Factorial function.
This is the ...
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1answer
219 views
Printing the number of ways a message can be decoded
My below solution to the following problem is exceeding the maximum recursion depth. I am looking for any improvements which i can make.
Problem
Alice and Bob need to send secret messages to each ...
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5answers
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Python: pass “mutable integer” in recursion
I'm working on some code to find the max depth/height in a tree. I came up with a recursive solution, and I find myself needing to pass an integer "by reference". Currently, I'm using a mutable ...
2
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2answers
106 views
Continued fraction with relative precision in Python
I have the following recursive function to compute the continued fraction:
$$s_i = \frac{a_{i}}{b_{i} + s_{i+1}}$$
The relative error is defined as:
$$\text{Delta} = \frac{s_n - s_{n-1}}{s_{n}}$$
...
4
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3answers
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1answer
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Berlekamp–Massey Algorithm in Haskell
I was recently tasked to write an implementation of the Berlekamp–Massey algorithm (for GF2) from a given inductional proof and decided to fresh up on my Haskell, since converting a proof by induction ...
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3answers
330 views
Sudoku Solver questions on style and algorithm
I am working towards a CSC degree right now and wanted to try and practice writing good code that could be easily maintained and read in industry. I wrote the following program in Java that takes a ...
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1answer
125 views
Recursive function to get all Zendesk tickets
I'm developing a Python library to consume the Zendesk search API.
Problem is, Zendesk limits search results to 1000 items. Thus in order to get all the results if they are greater than 1000 I need to ...
2
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0answers
53 views
Kadanes algorithm implementation
I just wanted to ask the following question. I have solved Kadanes algorithm using the recursive approach as shown below. The implementation works
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4
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1answer
232 views
Minesweeper - Python 3 (beginner)
I’ve just created Minesweeper game, which work perfectly fine (for me).
Any suggestions on how to improve this code would be greatly appreciate, in terms of:
Object-oriented
Array
Error handling
...
9
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1answer
300 views
Number in words: recursive function
I would appreciate some feedback on the below code I wrote for a Project Euler problem. The answer comes out correct but I'd like feedback on the design of the function and implementation of ...
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2answers
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Recursive Mergesort using goroutines
When learning a new language, one of my first tasks I like to go through is writing a few different sorting algorithms in that language to help familiarize myself with the syntax and see if there are ...
