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# Questions tagged [programming-challenge]

Programming challenges are off-site challenges meant to offer programmers educational experiences while testing their abilities.

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### duplicate an open file descriptor [closed]

My program implements a function similar to `dup2'. I would like you to please find any problems with the code and what I could improve. code: ...
95 views

### Partition List in 2 parts

I came up with the following code while trying to solve the Leetcode partition list problem Though my solution is accepted, I am not happy with a few of the additional variables which I am creating. ...
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### Counting primes less than n in Python

I implemented (a refinement of) the Sieve of Eratosthenes for counting primes less than a given number n. This is a coding exercise from LeetCode. The class Solution...
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### MP3 Playlist Class in Python

Background Info I am an intermediate level Python programmer. This is my implementation of a MP3 Playlist class challenge that was hosted on 101 Computing.Net. The ...
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### Python program for the Longest Substring Without Repeating Characters

I write my Python program below for this Leetcode problem: Given a string s, find the length of the longest substring without repeating characters. Example 1: ...
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2k views

### Split word based on terms from an array

I was faced with a coding challenge and I'm looking for a more elegant way to achieve the goal. The challenge Take the word baseball from the first item in the string array and split it into two ...
3k views

### Determine if Hill or Valley

This is my accepted submission for LeetCode. The problem is You are given a 0-indexed integer array nums. An index i is part of ...
453 views

### Subarrays with length

You are given an array A of length N (where N is as large as 2×105). All elements of the array are positive integers less than or equal to N. Determine the count of subarrays (contiguous subsequences) ...
120 views

### Largest product in a series

Problem description: The four adjacent digits in the 1000-digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832. 73167176531330624919225119674426574742355349194934 ...
1k views

### the 10001st prime number

Problem description: By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10001st prime number? Prime number: A prime number is a whole ...
319 views

### LeetCode 68. Text Justification

I am trying out Leetcode problem 68 and I need your help to asses the code. I am pretty new to this. Given an array of strings words and a width ...
195 views

### Sum square difference

Problem description: The sum of the squares of the first ten natural numbers is, 1² + 2² + … + 10² = 385 The square of the sum of the first ten natural numbers is, (1 + 2 + … + 10)² = 55² = 3025 Hence ...
2k views

### The smallest positive number that is evenly divisible by all of the numbers from 1 to 20

Problem description: 2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of ...
699 views

### The largest palindrome made from the product of two 3-digit numbers

Problem description: A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99. Find the largest palindrome made from the ...
661 views

### Calculate the first largest factor of 600851475143

ٍProblem description: The prime factors of 13195 are 5, 7, 13 and 29. Largest prime factor 13195 is 29. What is the largest prime factor of the number 600851475143 ? Prime Factor: any of the prime ...
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### Cleanly modifying values in hashmap for a k-sum challenge

Just started learning Rust and here's a program that has caused me some agony to implement in Rust. This is very easy to implement in C++, but Rust's borrow checker is causing all sorts of trouble. My ...
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1 vote
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### JavaScript function that generates Fibonacci like sequences of given order

Generalizations of Fibonacci numbers Fibonacci numbers of higher order A Fibonacci sequence of order $n$ is an integer sequence in which each sequence element is the sum of the previous $n$ ...
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### A simple JavaScript function that does prime factorization

This is a simple JavaScript function that does prime factorization. I wrote it on an Android phone with online editor (I don't have access to computers in night time): Code: ...
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### FizzBuzz in JavaScript (node.js), my first JavaScript program

I had just decided to learn JavaScript, so I wrote this program. I am sure you know what FizzBuzz is so I wouldn't describe it here. Console output: ...
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1 vote
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### Infix calculator programming challenge Kattis.com

I'm working on this C++ coding problem: Input is a sequence of up to commands, one per line, ending at end of file. Each command is a definition, a calculation, or a clear. All tokens within a ...
343 views

### Algorithm for twoSum

This is my PHP algorithm for the twoSum problem in leetCode: ...
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1 vote
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### PyQt6 program that lets you adjust the HSV values of an RGB color

I don't know how to actually describe what this script does concisely. I am writing GUI programs using PyQt6, and I want the most beautiful palette for my programs, so I browsed Wikipedia for a bunch ...
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### LeetCode: C# fibonacci number iterative solution

https://leetcode.com/problems/fibonacci-number/ The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding ones,...
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### Find local maxima of a sequence

I'm well versed in Python and Java, am just starting out with C++. Am enjoying the language and would really appreciate feedback on this solution. kata: Return positions and values of the "peaks&...
382 views

### Codewars - How many pages in a book?

Problem Statement Every book has n pages with 1 to n pages. The summary is made by adding ...
1 vote
231 views

### Finding the winner of a tic-tac-toe game in Swift

Working on the problem Find Winner on a Tic Tac Toe Game, I took several hours longer than an artificial time constraint the site had for mock interview purposes. This leads me to wonder if my ...
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### Leetcode problem: minimum removal to make valid parentheses

I was working on this problem on leetcode Question Your task is to remove the minimum number of parentheses ( '(' or ')', in any positions ) so that the resulting parentheses string is valid and ...
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### Python 3 number convertor that converts floats between decimal and bases 2-36

This is a Python 3 script that converts any real number (ints and floats) from decimal notation to any positional number system ...
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### Distribute items over array in order to minimize the difference between min and max array values

I came across this problem in a programming challenge a few days ago. I came up with the implementation below, however it resulted in a "time limit exceeded" failure for a few of the test ...
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### Haskell solution to Day 2 problem of Advent of Code '21

I won't restate the problem in full, but in a nutshell you have to parse a file with a "direction" and a "magnitude", for instance: ...
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### Algorithm Challenge: Fuzzy Search

I recently took part in an algorithm challenge to create a Fuzzy search with the following criteria: Given a set array, create a function that receives one argument and returns a new array containing ...
122 views

### Function to sum all Armstrong numbers within a range

I've tried to solve a challenge posted on a LinkedIn forum using Haskell - a language I'm still learning the basics of - and, while the code works correctly, I would like to get some feedback on the ...
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### follow-up - Checking Nested Bracket Levels in Strings Programming Challenge

A follow-up to this question, this post improves on test case issues. To restate problem parameters, a given string S is considered closed if it: Has a matching ...
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### Programming Challenge - Capturing Bracket Levels

I don't have a formal description for this problem, but here are the parameters: Given a string S check that each opening bracket has a matching closing bracket. ...
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### GeekTrust: Traffic problem - functional programming

First attempt to write functional programming, been following OO paradigm all through my programming journey Please review the code and let me know if any comments and violations of functional ...
169 views

### Array rotation in C++

I am completely new to data structures and algorithms. I tried this problem on hackerank. I got the desired output but my code wasn't efficient enough to execute in the given time limit. How can I ...
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### Programming Challenge: Python 3 DNS query resolver using socket

This is a DNS query resolver written in Python 3 using socket, I wrote it entirely by myself, it supports 8 primary DNS query types: A, NS, CNAME, SOA, PTR, MX, TXT,...
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### Chapter 8 Challenge: Add employee names to a department

The boring but exciting challenge: Using a HashMap and HashSet, create a text interface to allow a user to add employee names ...
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### Programming Challenge - Game Scoring

Can this solution be made more efficient? game_scoring.py ...
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1 vote
1k views

### HackerRank CountingSort 1 in C#

Comparison Sorting Quicksort usually has a running time of n x log(n), but is there an algorithm that can sort even faster? In general, this is not possible. Most sorting algorithms are comparison ...
1k views

### Calculator using variable names

I've recently been assigned an assignment to create a word calculator, and given my knowledge in python is still quite lacking, I want to ask if anybody has any better ideas for any possible solutions....
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### LFU Cache implementation in Python 3

Need some feedback on this implementation of LFU cache in python3. Original problem : https://leetcode.com/problems/lfu-cache/ Would really appreciate some feedback on readability, understandability ...
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### Highly divisible triangular number

Highly divisible triangular number, my solution My solution of challenge from Project Euler takes too much time to execute. Although on lower numbers it works fine. Anyone could look up to my code and ...
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### Coding exercise to implement IsApproximatelyEqual in Java

this assignment was given to me within the job application process (well, really not much infos given): for our applikation we have to compare very often floating point numbers (double, float). Can ...
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451 views

### Which fruit fall onto my house?

I am following a question on a programming challenge website (here's the original reference). What I have is a house (start & endpoint) and some types of trees at their respective location points. ...
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1 vote
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### It is considered a daemon if it runs in the background - creating a daemon in C

I created a daemon that creates a fifo file with a default name, then is been blocked waiting for messages on that fifo. When an interactive process writes data to that fifo, the daemon wakes up and ...
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### Maximum Depth of Binary Tree in JavaScript

The task Given the root of a binary tree, return its maximum depth. A binary tree's maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. ...
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