Loops are a type of control flow structure, in which, a series of statements may be executed repeatedly until some condition is met.

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Starting multiple Bitcoin daemons [on hold]

I've written following bash script in order to start multiple instances of a programm daemon (bitcoind = Bitcoin daemon) starting upon multiple independent conf-files: ...
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19 views

Word Counting from Array onto Output File [on hold]

For this problem, I have to have two text files: one for list of words that need to be found and other containing the document that needs to be search. The results would placed in a output "results" ...
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How to use writerow or append to print iterable to CSV column? [on hold]

I'm struggling with an easy question. I would like to be able to print 'value' to a column as many times as there are integers in 'count'. I can print the correct result, but not write to a list in a ...
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3answers
73 views

Minimum coins algorithm in Ruby

I am working on a puzzle to find the minimum number of coins needed to buy a product. I am given three coins: 1 3 5 and also a number representing the price of a product: 11 The answer here ...
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42 views

How to avoid nested loops

I have a program that uses a lot of nested loops because I am terrible in creating an efficient program. For example: ...
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2answers
29 views

Identifying numeric substrings of an alphanumeric string, and summing them

I am going through the CodingBat exercises for Java. Here is the task I have just completed: Given a string, return the sum of the numbers appearing in the ...
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2answers
28 views

Returning matching substrings, of n length, at the beginning and end of a string

I am going through the Java CodingBat exercises. Here is the one I have just completed: Given a string, return the longest substring that appears at both the beginning and end of the string ...
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4answers
330 views

Summing digits of an alphanumeric string

I am going through the Java CodingBat exercises. Here is the one I have just completed: Given a string, return the sum of the digits 0-9 that appear in the ...
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0answers
60 views

Page Spider in PHP

I have a working spider, however, it runs fairly slowly thanks to Australia's horrible internet. Can anyone give me some tips on speeding this up? ...
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0answers
32 views

groupJoin() in Swift

I have created the following function in Swift for this library I am writing, which joins two arrays on a key (extracted using given closures), and then groups them by key in a ...
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1answer
66 views

removeAll(closure) in Swift

From this library I wrote, I have created this function in Swift, but I'm not happy with the implementation. Can anyone suggest a better way to do this? I really don't like changing counters inside ...
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3answers
57 views

Case insensitively removing a substring, efficiently

I am going through the CodingBat exercises for Java. I have just completed this one: Given two strings, base and remove, ...
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4answers
649 views

Imaging with getPixel() and loops

I wrote perfectly working code that reads an image, and then does a kind of threshold on it by zone. If the zone has too much white then it turns all the zone into white, otherwise it turns into ...
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2answers
83 views

Changing algorithm to avoid looping with iterrows

I am new to Python. I wrote a code that works but the algorithm is obviously not efficient at all. I am stuck in the loop on iterrows and I do not see how to get rid of it. First a little bit on the ...
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4answers
94 views

Redacting everything in a string except a particular word

I am working through the Coding Bat exercises for Java. Here is one I have just completed: Given a string and a non-empty word string, return a version of the original String where all chars have ...
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1answer
49 views

Project Euler Problem 52: Permuted multiples

This is my solution to Project Euler Problem 52 - Permuted Multiples. In the problem I'm searching for the smallest value of x such that x, 2x, 3x, 4x, 5x, and 6x use the same digits. ...
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1answer
388 views

Cutting The Sticks

Problem Statement This is a challenge from HackerRank: You are given N sticks, where each stick has the length of a positive integer. A cut operation is performed on the sticks such that all of ...
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1answer
187 views

Counting occurrences of substring in string

I need to know how many times a substring occurs in a given string. I figured that I might as well create an extension method: ...
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2answers
38 views

Assembly Summation Implementation

I wrote a simple summation program in MARS to practice using loops and jump instructions. I feel like this is pretty lightweight and wanted some feedback on possible improvements: Lowering ...
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0answers
22 views

Can I condense these values with a loop? [migrated]

I have a set of values that get modified like so: ...
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0answers
77 views

Genetic algorithm for the minimum of the Schaffer function

I have to implement a genetic algorithm in R to optimize the minimum of the Schaffer function. Below I describe each step and I need to create one big function and another loop for 100 iterations (and ...
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2answers
50 views

Increasing FPS of updateMobs

I am starting to experience frame rate issues in my game and I've tracked it down to my updateMobs function. I would like tips and code examples from you guys to ...
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2answers
60 views
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2answers
95 views

Array to Tuple in Swift

I am burdened with the requirement of interacting with a C based library, which has a bunch of constant sized arrays (e.g. char[17]). When trying to assign or read ...
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1answer
59 views

Reduce nesting of for loops to increase efficiency [closed]

I need to optimize this code so it can execute faster, even if that means using more memory: ...
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3answers
58 views

Reserving seats in a movie theater

I'm writing a C program to reserve seats in a movie theater. I am validating the selection of seats: ...
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4answers
189 views

Custom Sum implementation

There is a custom summary function needed as to receive an integer input (e.g. 32456) and returns 3+2+4+5+6. Can you think of ...
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1answer
71 views

Populating an HTML combo box by looped concatenation

This code takes the results of a database query and uses them to populate the options in a combobox on a form. Would it be better to start with an empty htmlCode ...
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1answer
43 views

Is there a better way to split out join'd table data?

Consider the following segment of code: ...
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1answer
49 views

Check input from user

Aim: Read in the userID, check if the userID has 10-digits and check if it not exists in database, when both right, the program will leave the loop. This code works on my project, but I think its not ...
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2answers
75 views

Show first n elements of array, and count elements not shown

This code mimics the "likes" tooltip from Facebook. Given an array with the list of users that liked the content, it shows the first n users and displays a final item with the count of the users not ...
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2answers
73 views

Refactoring a loop through repetitive registers

I use NHibernate to search for data in the table Register. It contains monetary registers, incomes and outcomes. Some registers are repetitive, so I have managed to implement a few properties that my ...
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1answer
92 views

Render/Update game loop

I've just "finished" my second attempt a core game loop, which is a heavily refactored version of my first attempt. My perceived benefits are: Using functors means that the actual loops themselves ...
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3answers
80 views

Simple list comprehension

As far as I can tell, there is no network access happening at this stage in the code. I am accessing Reddit's API via the PRAW module. However, it is crawling, and I think it should be faster, ...
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1answer
36 views

Do my Image Widths Exceed Limit?

I needed to find whether any image's width at or higher than a certain directory folder exceeds a limit. Is this code a good way of doing this, or is there a way in which it can be improved? I ran ...
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1answer
43 views

Calculating solutions for the game “24”

I was bored this evening and decided to create a program which calculates all the solutions for a given scenario of the game "24". The goal of this game is that you try to be the first one to find ...
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3answers
144 views

Collection that can be modified in a foreach

Sometimes you want to add/remove items from a collection inside of a foreach loop. Since this isn't possible, a common pattern is to add the items to a separate ...
3
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3answers
112 views

Sieve of Eratosthenes in C#

Just because I've never written a real Sieve of Eratosthenes, I decided I should probably write one just to make sure I know what it is. I'd like (constructive) criticism on best practices, potential ...
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1answer
31 views

Calculating top position of elements based on their heights

I have a data representing several elements (that could be rendered at some point as div), composed of y position (property top) and its height (property height). ...
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1answer
57 views

Lodash chain implementation

I am mainly trying to avoid the nested forEach statements and am trying to move towards a lazy evaluation type solution. jsFiddle ...
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2answers
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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3answers
408 views

Nested loop to render tiles in a grid

This code works but I'm not really sure if I wrote it good enough. It seems a bit vague but I can't really assess it properly. I'm particularly concerned with the ...
4
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1answer
233 views

Optimizing critical loop for consuming a byte-buffer

I'm currently developing an Open Source project called sims3py using Python2.7. One overarching goal of the project is to ensure a Pure Python implementation of functions currently available only ...
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1answer
46 views

Perceptron algorithm

This is the Perceptron algorithm, I wrote this implementation with my friend. It gets the job done, but it's quite dirty, perhaps one of you stylish hackers might help me beautify this beast. This ...
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4answers
400 views

Calculating range of ArrayLists

I have written this method which calculates the range (max - min) of an ArrayList. I have two for loops each for a different ...
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1answer
43 views

DRYing out my Sass, looping through selectors

Need help with DRYing out my Sass... there is just so much repetition in here: ...
6
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1answer
77 views

Quicker way to go through 550 variables with very similar code

I'm hoping to figure out a faster way to write this before I resign myself to copying and pasting 500 times. I have code here that needs to do tons of vlookup matches. The only thing that changes ...
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3answers
122 views

Aggregate array values into ranges

In five minutes I made a pretty ugly looking function. Can you help before I have to commit the code into history? Requirements: I would like a function that takes an array of numbers, and ...
3
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1answer
36 views

Variable to byte decaying function

A function that prints out the values of each of the bytes of a variable, which value is given from stdin. Consists of size detector and a loop. ...
6
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2answers
145 views

Splitting three comma-delimited strings

I've been reading about loops this morning, to try to improve this snippet of code: ...