Looking for good programming challenges?

Use the search below to find our solutions for selected questions!

Gridland Metro challenge

Problem statement The city of Gridland is represented as an matrix where the rows are numbered from to and the columns are numbered from to . Gridland has a network of train tracks that always run in straight horizontal lines along a row. In other words, the start and end . . . Read more

Generating CSV reports from SQL*Plus

Problem statement Suppose you have a query whose result needs to be exported as a CSV file. In addition some fields need to be parsed into a different format and columns need to be renamed. The SPOOL command The SPOOL command causes SQL*Plus to write the results to a file. . . . Read more

A simple maze generation algorithm

Knowing how to create a maze is as essential as breathing. So here is a simple algorithm to create mazes along with a link to a GitHub repository for its implementation in Swift. Algorithm 1. Start at cell (1, 1). 2. Find a neighbor at random that you haven’t yet . . . Read more

Finding n-th permutation without computing others

Given S of size n and k, return the kth lexicographic permutation sequence. (Note: Given n will be between 1 and 10 inclusive.) For n = 10 variable symbols we have 10! possible permutations. The first step is to find the first symbol. If we fix a first symbol, then . . . Read more

Build WAR file with Maven and deploy with Ant

Minimalistic Ant script for Tomcat war file deployment. This script first does a mvn clean and mvn install on the defined maven project. It then connects to the provided server, stops the running Tomcat, uploads the newly created .war file to the Tomcat’s webapp directory and starts the Tomcat again. . . . Read more