# Questions tagged [programming-challenge]

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

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### Using separate functions for Project Euler 1

I started programming with Java and C++, so I'm used to having a 'main' function that calls other functions that do the actual work. At university I was always told that doing actual computation in ...
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### Project Euler problem 1 in Python - Multiples of 3 and 5

I'd like suggestions for optimizing this brute force solution to problem 1. The algorithm currently checks every integer between 3 and 1000. I'd like to cut as many unnecessary calls to ...
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### O(N) vs O(N * N) for Word Frequency Algorithm

I am trying to come up with a better solution to the following problem: Statement You are supposed to write a function which takes the contents of a document in string format and also a whole ...
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### Project Euler “Even Fibonacci numbers” in Java 8

I'm looking for general advice on my code on the following problem: Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms ...
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### Project Euler Problem #4 - Palindromic number

The problem is as follows: 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 ...
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### Hacker Rank: Array left rotation

This code is to solve the Hacker Rank problem array left rotation. A left rotation operation on an array of size n shifts each of the array's elements 1 unit to the left. For example, if 2 left ...
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### Duplicate like a weapon, arrays like heaven

Challenge: Find the duplicated entry. Specifications: Your program should accept as its first argument a path to a filename. Each line in this file is one test case. Each line begins ...
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### Yandex programming contest: Alarms

I've tried to solve this challenge about 4 hours during the contest, but all my attempts exceeded the time limit. I tried to solve it with min-heap, but can't pass all the tests. How it can be solved ...
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### Generating Robot Name

Problem: Write a program that manages robot factory settings. When robots come off the factory floor, they have no name. The first time you boot them up, a random name is generated, such ...
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### Count the occurence of nucleobases in DNA string

Inspired by this meta question I decided to take a look at Rosalind. Their first challenge seemed easy enough: An example of a length 21 DNA string (whose alphabet contains the symbols 'A', 'C', 'G', ...
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### ISBN missing number solver

This is a programming contest question. Question as follows Problem Definition An ISBN (International Standard Book Number) is a ten digit code that uniquely identifies a book. The first 9 ...
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### Sherlock and The Beast

This is my solution to this question from Hackerrank. Given N (<= 100000), find the largest N-digit number such that: The number has only 3 and 5 as its digits. Number of times 3 ...