Add new Delphi Pascal exercises

One of the easiest ways to add new exercises to the Delphi Pascal track is to translate them from other language tracks on Exercism. This page lists all of the problem specifications in the common pool of exercises which have not yet been implemented in Delphi Pascal.

The icon links to the language-independent description of the problem.

The icon links to the canonical test data.

We also link to all the implementations of each exercise in other languages, which you can use for inspiration.

Once you've picked an exercise, follow the instructions in this guide and submit your pull request to the Delphi Pascal track repository on GitHub.




Difference Of Squares

Find the difference between the square of the sum and the sum of the squares of the first N natural numbers.


Given a word and a list of possible anagrams, select the correct sublist.

Word Count

Given a phrase, count the occurrences of each word in that phrase.

Atbash Cipher

Create an implementation of the atbash cipher, an ancient encryption system created in the Middle East.


Calculate the moment when someone has lived for 10^9 seconds.

Scrabble Score

Given a word, compute the scrabble score for that word.

Space Age

Given an age in seconds, calculate how old someone is in terms of a given planet's solar years.

Largest Series Product

Given a string of digits, calculate the largest product for a contiguous substring of digits of length n.

Sum Of Multiples

Given a number, find the sum of all the multiples of particular numbers up to but not including that number.

Grade School

Given students' names along with the grade that they are in, create a roster for the school


Given a number determine whether or not it is valid per the Luhn formula.

Pascals Triangle

Compute Pascal's triangle up to a given number of rows.


Use the Sieve of Eratosthenes to find all the primes from 2 up to a given number.

Nth Prime

Given a number n, determine what the nth prime is.

All Your Base

Convert a number, represented as a sequence of digits in one base, to any other base.


Determine if a word or phrase is an isogram.

Bracket Push

Make sure the brackets and braces all match.

Prime Factors

Compute the prime factors of a given natural number.

Crypto Square

Implement the classic method for composing secret messages called a square code.


Given a string of digits, output all the contiguous substrings of length `n` in that string.


Implement the `accumulate` operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Secret Handshake

Given a decimal number, convert it to the appropriate sequence of events for a secret handshake.

Pig Latin

Implement a program that translates from English to Pig Latin

Queen Attack

Given the position of two queens on a chess board, indicate whether or not they are positioned so that they can attack each other.


Given a number from 0 to 999,999,999,999, spell out that number in English.

Flatten Array

Take a nested list and return a single list with all values except nil/null

List Ops

Implement basic list operations

Run Length Encoding

Implement run-length encoding and decoding.


Write a function to determine if a list is a sublist of another list.

Binary Search Tree

Insert and search for numbers in a binary tree.

Custom Set

Create a custom set type.

Ocr Numbers

Given a 3 x 4 grid of pipes, underscores, and spaces, determine which number is represented, or whether it is garbled.

Palindrome Products

Detect palindrome products in a given range.


Implement the `keep` and `discard` operation on collections. Given a collection and a predicate on the collection's elements, `keep` returns a new collection containing those elements where the predicate is true, while `discard` returns a new collection containing those elements where the predicate is false.


Correctly determine change to be given using the least number of coins

Kindergarten Garden

Given a diagram, determine which plants each child in the kindergarten class is responsible for.

Linked List

Implement a doubly linked list

Pythagorean Triplet

There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product a * b * c.

Food Chain

Generate the lyrics of the song 'I Know an Old Lady Who Swallowed a Fly'


Given a string representing a matrix of numbers, return the rows and columns of that matrix.

Simple Cipher

Implement a simple shift cipher like Caesar and a more secure substitution cipher


Given a letter, print a diamond starting with 'A' with the supplied letter at the widest point.

Rotational Cipher

Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.


Implement an evaluator for a very simple subset of Forth


Output the nursery rhyme 'This is the House that Jack Built'.


Implement a basic reactive system.

Simple Linked List

Write a simple linked list implementation that uses Elements and a List


Write a function to solve alphametics puzzles.


Compute the result for a game of Hex / Polygon


Tally the results of a small football competition.


Take input text and output it transposed.

Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'


Make a chain of dominoes.

Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

Protein Translation

Translate RNA sequences into proteins.

Variable Length Quantity

Implement variable length quantity encoding and decoding.


For want of a horseshoe nail, a kingdom was lost, or so the saying goes. Output the full text of this proverbial rhyme.

Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.


Creating a zipper for a binary tree.


Reparent a graph on a selected node


Count the rectangles in an ASCII diagram.

Spiral Matrix

Given the size, return a square matrix of numbers in spiral order.

Word Search

Create a program to solve a word search puzzle.

Complex Numbers

Implement complex numbers.

Diffie Hellman

Diffie-Hellman key exchange.


Search a file for lines matching a regular expression pattern. Return the line number and contents of each matching line.

Scale Generator

Generate musical scales, given a starting note and a set of intervals.

Two Bucket

Given two buckets of different size, demonstrate how to measure an exact number of liters.

Zebra Puzzle

Solve the zebra puzzle.

Error Handling

Implement various kinds of error handling and resource management


Refactor a Markdown parser

Sgf Parsing

Parsing a Smart Game Format string.

Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

Go Counting

Count the scored points on a Go board.


Implement the logic of the hangman game using functional reactive programming.


Refactor a ledger printer.

Lens Person

Use lenses to update nested records (specific to languages with immutable data).

Tree Building

Refactor a tree building algorithm.


Report network IO statistics