# Delphi Pascal

### 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.

### Anagram

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.

### Pangram

Determine if a sentence is a pangram.

### Scrabble Score

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

### Gigasecond

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

### Acronym

Convert a long phrase to its acronym

### Isogram

Determine if a word or phrase is an isogram.

### Luhn

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

### Sum Of Multiples

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

### Largest Series Product

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

### Pascals Triangle

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

### Robot Name

Manage robot factory settings.

### Sieve

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

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

### Meetup

Calculate the date of meetups.

### Nth Prime

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

### Crypto Square

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

### Prime Factors

Compute the prime factors of a given natural number.

### Series

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

### Robot Simulator

Write a robot simulator.

### Run Length Encoding

Implement run-length encoding and decoding.

### Accumulate

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.

### 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.

### Say

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

### Diamond

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

### Flatten Array

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

### Sublist

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.

### List Ops

Implement basic list operations

### Rotational Cipher

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

### Palindrome Products

Detect palindrome products in a given range.

### Strain

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.

### Change

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

### Ocr Numbers

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

### Transpose

Take input text and output it transposed.

### Kindergarten Garden

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

### Protein Translation

Translate RNA sequences into proteins.

### Pythagorean Triplet

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

### Simple Cipher

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

### Complex Numbers

Implement complex numbers.

### Food Chain

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

### Matrix

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

### React

Implement a basic reactive system.

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

### Spiral Matrix

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

### Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'

### Alphametics

Write a function to solve alphametics puzzles.

### Connect

Compute the result for a game of Hex / Polygon

### Dominoes

Make a chain of dominoes.

### Forth

Implement an evaluator for a very simple subset of Forth

### House

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

### Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

### Rectangles

Count the rectangles in an ASCII diagram.

### Tournament

Tally the results of a small football competition.

### Variable Length Quantity

Implement variable length quantity encoding and decoding.

### Zipper

Creating a zipper for a binary tree.

### Diffie Hellman

Diffie-Hellman key exchange.

### Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

### Two Bucket

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

### Markdown

Refactor a Markdown parser

### Grep

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

### Pov

Reparent a graph on a selected node

### Scale Generator

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

### Word Search

Create a program to solve a word search puzzle.

### Error Handling

Implement various kinds of error handling and resource management

### Rational Numbers

Implement rational numbers.

### Zebra Puzzle

Solve the zebra puzzle.

### Go Counting

Count the scored points on a Go board.

### Sgf Parsing

Parsing a Smart Game Format string.

### Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

### Tree Building

Refactor a tree building algorithm.

### Yacht

Score a single throw of dice in the game Yacht

### Hangman

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

### Ledger

Refactor a ledger printer.

### Lens Person

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

### Paasio

Report network IO statistics