# 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.

### Gigasecond

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.

### Isogram

Determine if a word or phrase is an isogram.

### Pascals Triangle

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

### Robot Name

Manage robot factory settings.

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

### Luhn

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

### Meetup

Calculate the date of meetups.

### Nth Prime

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

### Sieve

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

### Acronym

Convert a long phrase to its acronym

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

### Prime Factors

Compute the prime factors of a given natural number.

### Robot Simulator

Write a robot simulator.

### Series

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

### Bracket Push

Make sure the brackets and braces all match.

### Crypto Square

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

### 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.

### Run Length Encoding

Implement run-length encoding and decoding.

### Say

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

### Secret Handshake

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

### Sublist

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

### Flatten Array

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

### Binary Search Tree

Insert and search for numbers in a binary tree.

### Diamond

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

### Custom Set

Create a custom set type.

### List Ops

Implement basic list operations

### Ocr Numbers

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

### Rotational Cipher

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

### 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

### Palindrome Products

Detect palindrome products in a given range.

### 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'

### Kindergarten Garden

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

### Matrix

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

### Transpose

Take input text and output it transposed.

### Protein Translation

Translate RNA sequences into proteins.

### React

Implement a basic reactive system.

### Connect

Compute the result for a game of Hex / Polygon

### Forth

Implement an evaluator for a very simple subset of Forth

### House

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

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.

### Tournament

Tally the results of a small football competition.

### Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'

### Alphametics

Write a function to solve alphametics puzzles.

### Complex Numbers

Implement complex numbers.

### Dominoes

Make a chain of dominoes.

### Isbn Verifier

Check if a given string is a valid ISBN-10 number.

### Parallel Letter Frequency

Count the frequency of letters in texts using parallel computation.

### Zipper

Creating a zipper for a binary tree.

### Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

### Rectangles

Count the rectangles in an ASCII diagram.

### Two Bucket

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

### Variable Length Quantity

Implement variable length quantity encoding and decoding.

### Diffie Hellman

Diffie-Hellman key exchange.

### Pov

Reparent a graph on a selected node

### Proverb

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

### Word Search

Create a program to solve a word search puzzle.

### Markdown

Refactor a Markdown parser

### Zebra Puzzle

Solve the zebra puzzle.

### Error Handling

Implement various kinds of error handling and resource management

### Grep

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.

### Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

### Go Counting

Count the scored points on a Go board.

### Sgf Parsing

Parsing a Smart Game Format string.

### Tree Building

Refactor a tree building algorithm.

### 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