kotlin-99 | Ninety-Nine Problems in Kotlin | Learning library

kotlin-99 is a Kotlin library typically used in Tutorial, Learning, Example Codes applications. kotlin-99 has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

This is an adaptation of Ninety-Nine Scala Problems by Phil Gold which itself is an adaptation of the Ninety-Nine Prolog Problems written by Werner Hett at the Berne University of Applied Sciences in Berne, Switzerland. Some problems have been altered to be more amenable to programming in Kotlin. You might want to do these problems if you want to learn Kotlin, are interested in the problems described below, or both. The main reason to prefer this to using websites like hackerrank.com and codewars.com is that there is no vendor lock-in and no hidden agenda pursued by the website owner. The suggested workflow is to solve a problem yourself and then compare solution to the one provided. Solutions are available by clicking on the link at the beginning of the problem description. Your goal should be to find the most elegant solution to the given problems. Efficiency is important, but clarity is even more crucial. Some of the (easy) problems can be trivially solved using built-in functions. However, in these cases, you can learn more if you try to find your own solution. The problems have different levels of difficulty. Those marked with a single asterisk * are easy. If you have successfully solved the preceding problems, you might be able to solve them within a few (say 15) minutes. Problems marked with two asterisks ** are of intermediate difficulty and might take about 30-90 minutes to solve. Problems marked with three asterisks *** are more difficult. You may need more time (i.e. a few hours or more) to find a good solution. Please note that levels of difficulty is just a guess and assumes you are somewhat familiar with the problem domain. It is perfectly ok if some of them take longer. Overall, the goal is to learn, not to finish "on time". You might notice that there are less than 99 problems. This is because numbering of original problems was wrong. It was kept here for consistency with 99 problems in other programming languages. The first 50 or so problems are easy. If this is boring for you, feel free to jump to Binary Trees. All contributions are welcome (including alternative solutions for problems which already have a solution).