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This page provides the Exercism community with the information and tools needed to manage the Rust track.

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Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Synced primary repo: dc78814c50266cf2c9a649af7f0f3f226c905b67 (Updates should be instant)

Next goal: Implement 139 practice exercises. Find out more.

98 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

99,503

176,953 (avg. 1.8)

85,086 (85.5%)

28 (0.0%)

Reverse String

48,111

167,246 (avg. 3.5)

31,822 (66.1%)

4,790 (10.0%)

Gigasecond

32,986

96,196 (avg. 2.9)

25,471 (77.2%)

4,098 (12.4%)

Clock

20,478

180,168 (avg. 8.8)

14,202 (69.4%)

3,005 (14.7%)

Anagram

12,994

90,250 (avg. 6.9)

9,535 (73.4%)

2,066 (15.9%)

Space Age

9,150

35,483 (avg. 3.9)

7,367 (80.5%)

1,224 (13.4%)

Sublist

15,189

88,143 (avg. 5.8)

9,871 (65.0%)

1,290 (8.5%)

Minesweeper

7,390

52,679 (avg. 7.1)

4,975 (67.3%)

794 (10.7%)

Luhn

6,936

46,503 (avg. 6.7)

5,740 (82.8%)

652 (9.4%)

Armstrong Numbers

12,712

63,816 (avg. 5.0)

10,481 (82.4%)

345 (2.7%)

Bottle Song

404

2,849 (avg. 7.1)

278 (68.8%)

5 (1.2%)

Difference of Squares

12,484

27,696 (avg. 2.2)

11,287 (90.4%)

246 (2.0%)

Grains

10,963

37,886 (avg. 3.5)

9,689 (88.4%)

147 (1.3%)

Leap

20,883

32,474 (avg. 1.6)

18,149 (86.9%)

484 (2.3%)

Nth Prime

14,197

41,738 (avg. 2.9)

10,433 (73.5%)

388 (2.7%)

Prime Factors

8,270

24,531 (avg. 3.0)

6,818 (82.4%)

96 (1.2%)

Proverb

9,473

25,105 (avg. 2.7)

8,065 (85.1%)

147 (1.6%)

Raindrops

16,833

29,877 (avg. 1.8)

14,614 (86.8%)

423 (2.5%)

Sum of Multiples

9,631

29,623 (avg. 3.1)

8,102 (84.1%)

157 (1.6%)

Bob

10,095

40,572 (avg. 4.0)

8,205 (81.3%)

867 (8.6%)

High Scores

7,057

40,545 (avg. 5.7)

5,550 (78.6%)

137 (1.9%)

Matching Brackets

7,588

28,197 (avg. 3.7)

6,170 (81.3%)

276 (3.6%)

Collatz Conjecture

4,520

16,709 (avg. 3.7)

3,820 (84.5%)

69 (1.5%)

Series

4,179

14,403 (avg. 3.4)

3,477 (83.2%)

53 (1.3%)

Kindergarten Garden

2,025

12,094 (avg. 6.0)

1,511 (74.6%)

41 (2.0%)

Eliud's Eggs

1,272

3,402 (avg. 2.7)

1,111 (87.3%)

11 (0.9%)

Acronym

4,909

26,140 (avg. 5.3)

3,722 (75.8%)

60 (1.2%)

All Your Base

3,302

14,097 (avg. 4.3)

2,546 (77.1%)

46 (1.4%)

Allergies

5,233

29,544 (avg. 5.6)

4,016 (76.7%)

123 (2.4%)

Alphametics

2,766

14,168 (avg. 5.1)

1,143 (41.3%)

57 (2.1%)

Binary Search

3,964

15,394 (avg. 3.9)

3,109 (78.4%)

46 (1.2%)

Bowling

3,087

19,388 (avg. 6.3)

1,697 (55.0%)

41 (1.3%)

DOT DSL

3,889

14,819 (avg. 3.8)

2,316 (59.6%)

63 (1.6%)

ETL

3,507

6,961 (avg. 2.0)

2,911 (83.0%)

31 (0.9%)

Grade School

3,149

11,426 (avg. 3.6)

2,598 (82.5%)

34 (1.1%)

Hamming

3,662

6,646 (avg. 1.8)

3,213 (87.7%)

60 (1.6%)

ISBN Verifier

2,844

11,203 (avg. 3.9)

2,266 (79.7%)

29 (1.0%)

Isogram

3,306

8,355 (avg. 2.5)

2,781 (84.1%)

31 (0.9%)

Nucleotide Count

3,887

11,135 (avg. 2.9)

3,286 (84.5%)

46 (1.2%)

PaaS I/O

3,179

4,971 (avg. 1.6)

1,917 (60.3%)

17 (0.5%)

Palindrome Products

1,830

7,965 (avg. 4.4)

1,231 (67.3%)

23 (1.3%)

Pangram

3,003

6,926 (avg. 2.3)

2,596 (86.4%)

44 (1.5%)

Pascal's Triangle

3,493

8,216 (avg. 2.4)

2,858 (81.8%)

35 (1.0%)

Perfect Numbers

2,163

5,225 (avg. 2.4)

1,794 (82.9%)

38 (1.8%)

Pig Latin

1,441

4,720 (avg. 3.3)

912 (63.3%)

14 (1.0%)

Queen Attack

2,679

5,989 (avg. 2.2)

2,237 (83.5%)

16 (0.6%)

RNA Transcription

3,367

8,816 (avg. 2.6)

2,782 (82.6%)

39 (1.2%)

Run-Length Encoding

2,702

9,141 (avg. 3.4)

2,094 (77.5%)

34 (1.3%)

Saddle Points

3,220

6,665 (avg. 2.1)

2,211 (68.7%)

309 (9.6%)

Say

2,107

5,888 (avg. 2.8)

1,390 (66.0%)

15 (0.7%)

Scrabble Score

2,633

5,306 (avg. 2.0)

2,234 (84.8%)

27 (1.0%)

Sieve

2,785

6,684 (avg. 2.4)

2,300 (82.6%)

32 (1.1%)

Simple Linked List

4,352

25,773 (avg. 5.9)

2,786 (64.0%)

128 (2.9%)

Spiral Matrix

1,508

4,313 (avg. 2.9)

1,017 (67.4%)

11 (0.7%)

Tournament

2,842

18,729 (avg. 6.6)

2,046 (72.0%)

66 (2.3%)

Triangle

2,580

6,427 (avg. 2.5)

2,117 (82.1%)

28 (1.1%)

Two Bucket

1,390

2,815 (avg. 2.0)

730 (52.5%)

14 (1.0%)

Variable Length Quantity

1,382

4,378 (avg. 3.2)

892 (64.5%)

6 (0.4%)

Robot Simulator

3,289

13,149 (avg. 4.0)

2,689 (81.8%)

47 (1.4%)

Robot Name

1,689

7,232 (avg. 4.3)

1,149 (68.0%)

39 (2.3%)

Protein Translation

1,670

6,957 (avg. 4.2)

1,165 (69.8%)

18 (1.1%)

Wordy

1,217

4,164 (avg. 3.4)

820 (67.4%)

8 (0.7%)

Custom Set

1,526

5,833 (avg. 3.8)

1,008 (66.1%)

16 (1.0%)

Accumulate

1,523

5,356 (avg. 3.5)

1,134 (74.5%)

33 (2.2%)

Affine Cipher

981

4,485 (avg. 4.6)

635 (64.7%)

6 (0.6%)

Atbash Cipher

2,382

6,523 (avg. 2.7)

1,808 (75.9%)

801 (33.6%)

Crypto Square

1,214

3,417 (avg. 2.8)

800 (65.9%)

6 (0.5%)

Diamond

1,041

3,052 (avg. 2.9)

707 (67.9%)

1 (0.1%)

Largest Series Product

1,481

4,115 (avg. 2.8)

1,150 (77.7%)

19 (1.3%)

Luhn From

1,459

3,240 (avg. 2.2)

1,053 (72.2%)

10 (0.7%)

Luhn Trait

1,276

1,743 (avg. 1.4)

932 (73.0%)

5 (0.4%)

List Ops

342 (avg. 5.2)

49 (74.2%)

0 (0.0%)

Phone Number

1,346

4,160 (avg. 3.1)

1,001 (74.4%)

20 (1.5%)

Rail Fence Cipher

970

3,254 (avg. 3.4)

583 (60.1%)

5 (0.5%)

Roman Numerals

1,587

4,368 (avg. 2.8)

1,164 (73.3%)

13 (0.8%)

Rotational Cipher

1,326

2,717 (avg. 2.0)

1,005 (75.8%)

14 (1.1%)

Simple Cipher

1,105

3,861 (avg. 3.5)

696 (63.0%)

7 (0.6%)

Word Count

2,154

7,393 (avg. 3.4)

1,710 (79.4%)

46 (2.1%)

Secret Handshake

717

2,149 (avg. 3.0)

545 (76.0%)

14 (2.0%)

Knapsack

553

2,415 (avg. 4.4)

347 (62.7%)

4 (0.7%)

Yacht

679

5,284 (avg. 7.8)

488 (71.9%)

10 (1.5%)

Matrix

320

1,160 (avg. 3.6)

231 (72.2%)

1 (0.3%)

Fizzy

1,306

7,716 (avg. 5.9)

659 (50.5%)

18 (1.4%)

Pythagorean Triplet

4,068

7,592 (avg. 1.9)

2,227 (54.7%)

1,319 (32.4%)

Parallel Letter Frequency

4,329

23,985 (avg. 5.5)

2,686 (62.0%)

540 (12.5%)

Macros

3,254

16,594 (avg. 5.1)

2,421 (74.4%)

323 (9.9%)

Poker

4,370

27,263 (avg. 6.2)

1,440 (33.0%)

273 (6.2%)

Forth

2,177

16,446 (avg. 7.6)

1,051 (48.3%)

179 (8.2%)

OCR Numbers

1,215

3,983 (avg. 3.3)

712 (58.6%)

14 (1.2%)

React

1,844

6,611 (avg. 3.6)

628 (34.1%)

31 (1.7%)

Circular Buffer

1,885

7,413 (avg. 3.9)

1,171 (62.1%)

50 (2.7%)

Rectangles

1,259

4,815 (avg. 3.8)

652 (51.8%)

15 (1.2%)

Xorcism

1,090

5,436 (avg. 5.0)

423 (38.8%)

29 (2.7%)

Book Store

871

2,327 (avg. 2.7)

392 (45.0%)

6 (0.7%)

Decimal

1,064

4,743 (avg. 4.5)

438 (41.2%)

7 (0.7%)

Grep

1,047

4,432 (avg. 4.2)

512 (48.9%)

9 (0.9%)

Dominoes

1,021

3,722 (avg. 3.6)

498 (48.8%)

20 (2.0%)

Doubly Linked List

1,161

4,353 (avg. 3.7)

336 (28.9%)

25 (2.2%)

6 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

Beer Song

14,211

78,897 (avg. 5.6)

11,147 (78.4%)

254 (1.8%)

Diffie-Hellman

4,014

16,870 (avg. 4.2)

2,764 (68.9%)

57 (1.4%)

Hexadecimal

120

184 (avg. 1.5)

114 (95.0%)

10 (8.3%)

Nucleotide Codons

133

157 (avg. 1.2)

129 (97.0%)

1 (0.8%)

Scale Generator

1,132

4,435 (avg. 3.9)

499 (44.1%)

9 (0.8%)

Two Fer

28 (avg. 1.2)

4 (17.4%)

1 (4.3%)

41 unimplemented practice exercises

Baffling Birthdays

Bank Account

Binary Search Tree

Change

Complex Numbers

Connect

Conway's Game of Life

D&D Character

Darts

Error Handling

Flatten Array

Food Chain

Go Counting

Hangman

House

Killer Sudoku Helper

Ledger

Lens Person

Linked List

Markdown

Meetup

Micro Blog

POV

Rational Numbers

Relative Distance

Resistor Color

Resistor Color Duo

Resistor Color Trio

REST API

Satellite

SGF Parsing

Square Root

State of Tic-Tac-Toe

Strain

Swift Scheduling

Transpose

Tree Building

Twelve Days

Word Search

Zebra Puzzle

Zipper

3 foregone practice exercises

Binary

View data

Octal

View data

Trinary

View data

Programming Tags

Learn More

Help manage the tags used to group, filter and recommend solutions, approaches and articles.

0 tags

Test Runner

Learn More

Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Current version: 6cb2062659ad4bd15ba01e40e60fc348588e8868 (Takes up to 10 mins to deploy)

Total Test Runner Runs

2,671,776

Test Run Pass Rate

24.8% (663139)

Test Run Fail Rate

22.8% (608467)

Test Run Error Rate

52.4% (1400170)

Representer

Learn More

Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

Current version: 56aae4fdfd430121d561e83609fcc9b2ce350923 (Takes up to 10 mins to deploy)

Total Representer Runs

950,358

Total Representation Comments Made

61,583

Feedback Given Frequency

6.5%

Analyzer

Learn More

Build an Analyzer for Rust: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

Current version: 02286f694f985bc6f51e2b31e24c237c14a52215 (Takes up to 10 mins to deploy)

Total Analyzer Runs

661,684

Total Analysis Comments Made

167,089

Feedback Given Frequency

2.8%

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