### Add new Rust exercises

One of the easiest ways to add new exercises to the Rust 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 Rust.

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 Rust track repository on GitHub.

### Meetup

Calculate the date of meetups.

### Isogram

Determine if a word or phrase is an isogram.

### Binary Search

Implement a binary search algorithm.

### Crypto Square

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

### Perfect Numbers

Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for natural numbers.

### Series

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

### Secret Handshake

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

### List Ops

Implement basic list operations

### 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.

### Binary Search Tree

Insert and search for numbers in a binary tree.

### Flatten Array

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

### Kindergarten Garden

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

### Linked List

Implement a doubly linked list

### Palindrome Products

Detect palindrome products in a given range.

### Saddle Points

Detect saddle points in a matrix.

### Change

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

### 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.

### Simple Cipher

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

### Bank Account

Simulate a bank account supporting opening/closing, withdraws, and deposits of money. Watch out for concurrent transactions!

### Diamond

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

### House

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

### Connect

Compute the result for a game of Hex / Polygon

### Simple Linked List

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

### Transpose

Take input text and output it transposed.

### Twelve Days

Output the lyrics to 'The Twelve Days of Christmas'

### Collatz Conjecture

Calculate the number of steps to reach 1 using the Collatz conjecture

### Poker

Pick the best hand(s) from a list of poker hands.

### Book Store

To try and encourage more sales of different books from a popular 5 book series, a bookshop has decided to offer discounts of multiple-book purchases.

### Rail Fence Cipher

Implement encoding and decoding for the rail fence cipher.

### Zipper

Creating a zipper for a binary tree.

### Pov

Reparent a graph on a selected node

### Spiral Matrix

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

### Two Fer

Create a sentence of the form "One for X, one for me."

### Word Search

Create a program to solve a word search puzzle.

### Diffie Hellman

Diffie-Hellman key exchange.

### 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.

### Two Bucket

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

### Error Handling

Implement various kinds of error handling and resource management

### Markdown

Refactor a Markdown parser

### Sgf Parsing

Parsing a Smart Game Format string.

### Complex Numbers

Implement complex numbers.

### Dot Dsl

Write a Domain Specific Language similar to the Graphviz dot language

### Go Counting

Count the scored points on a Go board.

### 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).

### Tree Building

Refactor a tree building algorithm.

### Paasio

Report network IO statistics