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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: 5deb659b82533b975c361b4045b5540d01ae9952 (Updates should be instant)

Next goal: Implement 142 practice exercises. Find out more.

98 active practice exercises

Started

Attempts

Completions

Mentoring requests

Hello World

102,119

182,253 (avg. 1.8)

87,120 (85.3%)

28 (0.0%)

Reverse String

49,816

174,511 (avg. 3.5)

32,887 (66.0%)

4,831 (9.7%)

Gigasecond

34,019

100,034 (avg. 2.9)

26,190 (77.0%)

4,109 (12.1%)

Clock

21,094

187,960 (avg. 8.9)

14,629 (69.4%)

3,022 (14.3%)

Anagram

13,467

94,503 (avg. 7.0)

9,865 (73.3%)

2,085 (15.5%)

Space Age

9,489

36,940 (avg. 3.9)

7,648 (80.6%)

1,235 (13.0%)

Sublist

15,483

89,850 (avg. 5.8)

10,119 (65.4%)

1,296 (8.4%)

Minesweeper

7,675

54,745 (avg. 7.1)

5,159 (67.2%)

798 (10.4%)

Luhn

7,173

48,261 (avg. 6.7)

5,950 (82.9%)

655 (9.1%)

Armstrong Numbers

13,123

65,637 (avg. 5.0)

10,835 (82.6%)

353 (2.7%)

Bottle Song

816

5,919 (avg. 7.3)

572 (70.1%)

13 (1.6%)

Difference of Squares

12,776

28,522 (avg. 2.2)

11,554 (90.4%)

251 (2.0%)

Grains

11,233

39,015 (avg. 3.5)

9,927 (88.4%)

147 (1.3%)

Leap

21,135

33,180 (avg. 1.6)

18,379 (87.0%)

485 (2.3%)

Nth Prime

14,437

42,965 (avg. 3.0)

10,630 (73.6%)

393 (2.7%)

Prime Factors

8,465

25,286 (avg. 3.0)

6,980 (82.5%)

97 (1.1%)

Proverb

9,640

25,824 (avg. 2.7)

8,218 (85.2%)

147 (1.5%)

Raindrops

17,033

30,548 (avg. 1.8)

14,802 (86.9%)

424 (2.5%)

Sum of Multiples

9,820

30,683 (avg. 3.1)

8,259 (84.1%)

159 (1.6%)

Bob

10,279

41,860 (avg. 4.1)

8,365 (81.4%)

867 (8.4%)

High Scores

7,255

42,302 (avg. 5.8)

5,712 (78.7%)

139 (1.9%)

Matching Brackets

7,759

29,050 (avg. 3.7)

6,323 (81.5%)

276 (3.6%)

Collatz Conjecture

4,705

17,308 (avg. 3.7)

3,985 (84.7%)

72 (1.5%)

Series

4,346

15,002 (avg. 3.5)

3,623 (83.4%)

53 (1.2%)

Kindergarten Garden

2,181

12,981 (avg. 6.0)

1,632 (74.8%)

43 (2.0%)

Eliud's Eggs

1,424

3,754 (avg. 2.6)

1,245 (87.4%)

11 (0.8%)

Acronym

5,072

27,410 (avg. 5.4)

3,851 (75.9%)

63 (1.2%)

All Your Base

3,430

14,757 (avg. 4.3)

2,648 (77.2%)

47 (1.4%)

Allergies

5,363

30,366 (avg. 5.7)

4,129 (77.0%)

124 (2.3%)

Alphametics

2,867

14,919 (avg. 5.2)

1,191 (41.5%)

59 (2.1%)

Binary Search

4,096

16,091 (avg. 3.9)

3,215 (78.5%)

46 (1.1%)

Bowling

3,185

20,608 (avg. 6.5)

1,750 (54.9%)

45 (1.4%)

DOT DSL

3,980

15,745 (avg. 4.0)

2,374 (59.6%)

64 (1.6%)

ETL

3,637

7,356 (avg. 2.0)

3,012 (82.8%)

31 (0.9%)

Grade School

3,230

11,770 (avg. 3.6)

2,657 (82.3%)

34 (1.1%)

Hamming

3,759

6,855 (avg. 1.8)

3,291 (87.5%)

61 (1.6%)

ISBN Verifier

2,921

11,693 (avg. 4.0)

2,334 (79.9%)

29 (1.0%)

Isogram

3,388

8,620 (avg. 2.5)

2,849 (84.1%)

31 (0.9%)

Nucleotide Count

3,969

11,563 (avg. 2.9)

3,355 (84.5%)

46 (1.2%)

PaaS I/O

3,273

5,338 (avg. 1.6)

1,979 (60.5%)

18 (0.5%)

Palindrome Products

1,905

8,629 (avg. 4.5)

1,278 (67.1%)

24 (1.3%)

Pangram

3,082

7,199 (avg. 2.3)

2,660 (86.3%)

44 (1.4%)

Pascal's Triangle

3,568

8,537 (avg. 2.4)

2,914 (81.7%)

35 (1.0%)

Perfect Numbers

2,237

5,456 (avg. 2.4)

1,855 (82.9%)

38 (1.7%)

Pig Latin

1,501

5,168 (avg. 3.4)

953 (63.5%)

14 (0.9%)

Queen Attack

2,744

6,137 (avg. 2.2)

2,289 (83.4%)

16 (0.6%)

RNA Transcription

3,437

9,054 (avg. 2.6)

2,841 (82.7%)

39 (1.1%)

Run-Length Encoding

2,767

9,386 (avg. 3.4)

2,142 (77.4%)

34 (1.2%)

Saddle Points

3,284

6,884 (avg. 2.1)

2,257 (68.7%)

309 (9.4%)

Say

2,162

6,197 (avg. 2.9)

1,428 (66.0%)

15 (0.7%)

Scrabble Score

2,701

5,409 (avg. 2.0)

2,285 (84.6%)

27 (1.0%)

Sieve

2,842

6,830 (avg. 2.4)

2,340 (82.3%)

32 (1.1%)

Simple Linked List

4,520

27,435 (avg. 6.1)

2,859 (63.3%)

130 (2.9%)

Spiral Matrix

1,558

4,501 (avg. 2.9)

1,048 (67.3%)

12 (0.8%)

Tournament

2,900

19,043 (avg. 6.6)

2,087 (72.0%)

66 (2.3%)

Triangle

2,646

6,641 (avg. 2.5)

2,165 (81.8%)

30 (1.1%)

Two Bucket

1,438

2,950 (avg. 2.1)

758 (52.7%)

15 (1.0%)

Variable Length Quantity

1,431

4,657 (avg. 3.3)

923 (64.5%)

6 (0.4%)

Robot Simulator

3,375

13,440 (avg. 4.0)

2,743 (81.3%)

47 (1.4%)

Robot Name

1,754

7,830 (avg. 4.5)

1,191 (67.9%)

40 (2.3%)

Protein Translation

1,724

7,220 (avg. 4.2)

1,207 (70.0%)

18 (1.0%)

Wordy

1,268

4,333 (avg. 3.4)

852 (67.2%)

8 (0.6%)

Custom Set

1,584

6,135 (avg. 3.9)

1,046 (66.0%)

16 (1.0%)

Accumulate

1,581

5,643 (avg. 3.6)

1,175 (74.3%)

33 (2.1%)

Affine Cipher

1,029

4,823 (avg. 4.7)

670 (65.1%)

6 (0.6%)

Atbash Cipher

2,435

6,708 (avg. 2.8)

1,844 (75.7%)

801 (32.9%)

Crypto Square

1,264

3,664 (avg. 2.9)

831 (65.7%)

6 (0.5%)

Diamond

1,089

3,259 (avg. 3.0)

740 (68.0%)

1 (0.1%)

Largest Series Product

1,528

4,260 (avg. 2.8)

1,181 (77.3%)

19 (1.2%)

Luhn From

1,515

3,311 (avg. 2.2)

1,090 (71.9%)

10 (0.7%)

Luhn Trait

1,330

1,818 (avg. 1.4)

967 (72.7%)

5 (0.4%)

List Ops

142

699 (avg. 4.9)

95 (66.9%)

2 (1.4%)

Phone Number

1,391

4,231 (avg. 3.0)

1,033 (74.3%)

20 (1.4%)

Rail Fence Cipher

1,013

3,326 (avg. 3.3)

605 (59.7%)

5 (0.5%)

Roman Numerals

1,635

4,461 (avg. 2.7)

1,196 (73.1%)

14 (0.9%)

Rotational Cipher

1,373

2,785 (avg. 2.0)

1,038 (75.6%)

14 (1.0%)

Simple Cipher

1,143

3,975 (avg. 3.5)

719 (62.9%)

9 (0.8%)

Word Count

2,204

7,557 (avg. 3.4)

1,746 (79.2%)

46 (2.1%)

Secret Handshake

757

2,201 (avg. 2.9)

571 (75.4%)

15 (2.0%)

Knapsack

594

2,518 (avg. 4.2)

373 (62.8%)

4 (0.7%)

Yacht

716

5,526 (avg. 7.7)

511 (71.4%)

10 (1.4%)

Matrix

357

1,193 (avg. 3.3)

253 (70.9%)

1 (0.3%)

Fizzy

1,362

7,955 (avg. 5.8)

692 (50.8%)

18 (1.3%)

Pythagorean Triplet

4,111

7,661 (avg. 1.9)

2,257 (54.9%)

1,319 (32.1%)

Parallel Letter Frequency

4,387

24,298 (avg. 5.5)

2,723 (62.1%)

544 (12.4%)

Macros

3,297

16,739 (avg. 5.1)

2,444 (74.1%)

324 (9.8%)

Poker

4,409

27,674 (avg. 6.3)

1,459 (33.1%)

273 (6.2%)

Forth

2,211

16,610 (avg. 7.5)

1,067 (48.3%)

181 (8.2%)

OCR Numbers

1,245

4,057 (avg. 3.3)

728 (58.5%)

14 (1.1%)

React

1,887

6,969 (avg. 3.7)

644 (34.1%)

31 (1.6%)

Circular Buffer

1,933

7,779 (avg. 4.0)

1,208 (62.5%)

50 (2.6%)

Rectangles

1,290

4,864 (avg. 3.8)

669 (51.9%)

15 (1.2%)

Xorcism

1,126

5,541 (avg. 4.9)

440 (39.1%)

29 (2.6%)

Book Store

909

2,438 (avg. 2.7)

410 (45.1%)

7 (0.8%)

Decimal

1,097

4,912 (avg. 4.5)

456 (41.6%)

7 (0.6%)

Grep

1,086

4,511 (avg. 4.2)

532 (49.0%)

9 (0.8%)

Dominoes

1,056

3,816 (avg. 3.6)

517 (49.0%)

20 (1.9%)

Doubly Linked List

1,214

4,706 (avg. 3.9)

353 (29.1%)

26 (2.1%)

6 deprecated practice exercises

Started

Attempts

Completions

Mentoring requests

Beer Song

14,211

78,988 (avg. 5.6)

11,154 (78.5%)

255 (1.8%)

Diffie-Hellman

4,014

16,881 (avg. 4.2)

2,768 (69.0%)

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

4,444 (avg. 3.9)

499 (44.1%)

9 (0.8%)

Two Fer

28 (avg. 1.2)

4 (17.4%)

1 (4.3%)

44 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

Intergalactic Transmission

Killer Sudoku Helper

Ledger

Lens Person

Linked List

Markdown

Meetup

Micro Blog

Piecing It Together

POV

Rational Numbers

Relative Distance

Resistor Color

Resistor Color Duo

Resistor Color Trio

REST API

Satellite

SGF Parsing

Split-Second Stopwatch

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: 86a8afce38e74b1a6c13fb9dbb10c23239176241 (Takes up to 10 mins to deploy)

Total Test Runner Runs

2,748,152

Test Run Pass Rate

24.9% (683646)

Test Run Fail Rate

22.8% (625515)

Test Run Error Rate

52.4% (1438991)

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: 473cc904099a7249dabcbcbf28e901c8ada49fde (Takes up to 10 mins to deploy)

Total Representer Runs

968,701

Total Representation Comments Made

64,089

Feedback Given Frequency

6.6%

Analyzer

Learn More

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

Current version: fc4f49598cb75655e56dd98be3d5135843370d76 (Takes up to 10 mins to deploy)

Total Analyzer Runs

679,959

Total Analysis Comments Made

176,424

Feedback Given Frequency

2.9%

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