diff --git a/exercises/practice/leap/.docs/instructions.md b/exercises/practice/leap/.docs/instructions.md index a83826b2e..b14f8565d 100644 --- a/exercises/practice/leap/.docs/instructions.md +++ b/exercises/practice/leap/.docs/instructions.md @@ -1,22 +1,3 @@ # Instructions -Given a year, report if it is a leap year. - -The tricky thing here is that a leap year in the Gregorian calendar occurs: - -```text -on every year that is evenly divisible by 4 - except every year that is evenly divisible by 100 - unless the year is also evenly divisible by 400 -``` - -For example, 1997 is not a leap year, but 1996 is. -1900 is not a leap year, but 2000 is. - -## Notes - -Though our exercise adopts some very simple rules, there is more to learn! - -For a delightful, four minute explanation of the whole leap year phenomenon, go watch [this youtube video][video]. - -[video]: https://www.youtube.com/watch?v=xX96xng7sAE +Your task is to determine whether a given year is a leap year. diff --git a/exercises/practice/leap/.docs/introduction.md b/exercises/practice/leap/.docs/introduction.md new file mode 100644 index 000000000..1cb8b14cc --- /dev/null +++ b/exercises/practice/leap/.docs/introduction.md @@ -0,0 +1,16 @@ +# Introduction + +A leap year (in the Gregorian calendar) occurs: + +- In every year that is evenly divisible by 4 +- Unless the year is evenly divisible by 100, in which case it's only a leap year if the year is also evenly divisible by 400. + +Some examples: + +- 1997 was not a leap year as it's not divisible by 4. +- 1900 was not a leap year as it's not divisible by 400 +- 2000 was a leap year! + +~~~~exercism/note +For a delightful, four minute explanation of the whole phenomenon of leap years, check out [this youtube video](https://www.youtube.com/watch?v=xX96xng7sAE). +~~~~ diff --git a/exercises/practice/leap/.meta/config.json b/exercises/practice/leap/.meta/config.json index 813087c4c..234e5a6b5 100644 --- a/exercises/practice/leap/.meta/config.json +++ b/exercises/practice/leap/.meta/config.json @@ -23,7 +23,7 @@ "build.gradle" ] }, - "blurb": "Given a year, report if it is a leap year.", + "blurb": "Determine whether a given year is a leap year.", "source": "CodeRanch Cattle Drive, Assignment 3", "source_url": "https://coderanch.com/t/718816/Leap" } diff --git a/exercises/practice/perfect-numbers/.docs/instructions.md b/exercises/practice/perfect-numbers/.docs/instructions.md index 689a73c00..b2bc82ca3 100644 --- a/exercises/practice/perfect-numbers/.docs/instructions.md +++ b/exercises/practice/perfect-numbers/.docs/instructions.md @@ -2,22 +2,38 @@ Determine if a number is perfect, abundant, or deficient based on Nicomachus' (60 - 120 CE) classification scheme for positive integers. -The Greek mathematician [Nicomachus][nicomachus] devised a classification scheme for positive integers, identifying each as belonging uniquely to the categories of **perfect**, **abundant**, or **deficient** based on their [aliquot sum][aliquot-sum]. -The aliquot sum is defined as the sum of the factors of a number not including the number itself. +The Greek mathematician [Nicomachus][nicomachus] devised a classification scheme for positive integers, identifying each as belonging uniquely to the categories of [perfect](#perfect), [abundant](#abundant), or [deficient](#deficient) based on their [aliquot sum][aliquot-sum]. +The _aliquot sum_ is defined as the sum of the factors of a number not including the number itself. For example, the aliquot sum of `15` is `1 + 3 + 5 = 9`. -- **Perfect**: aliquot sum = number - - 6 is a perfect number because (1 + 2 + 3) = 6 - - 28 is a perfect number because (1 + 2 + 4 + 7 + 14) = 28 -- **Abundant**: aliquot sum > number - - 12 is an abundant number because (1 + 2 + 3 + 4 + 6) = 16 - - 24 is an abundant number because (1 + 2 + 3 + 4 + 6 + 8 + 12) = 36 -- **Deficient**: aliquot sum < number - - 8 is a deficient number because (1 + 2 + 4) = 7 - - Prime numbers are deficient - -Implement a way to determine whether a given number is **perfect**. -Depending on your language track, you may also need to implement a way to determine whether a given number is **abundant** or **deficient**. +## Perfect + +A number is perfect when it equals its aliquot sum. +For example: + +- `6` is a perfect number because `1 + 2 + 3 = 6` +- `28` is a perfect number because `1 + 2 + 4 + 7 + 14 = 28` + +## Abundant + +A number is abundant when it is less than its aliquot sum. +For example: + +- `12` is an abundant number because `1 + 2 + 3 + 4 + 6 = 16` +- `24` is an abundant number because `1 + 2 + 3 + 4 + 6 + 8 + 12 = 36` + +## Deficient + +A number is deficient when it is greater than its aliquot sum. +For example: + +- `8` is a deficient number because `1 + 2 + 4 = 7` +- Prime numbers are deficient + +## Task + +Implement a way to determine whether a given number is [perfect](#perfect). +Depending on your language track, you may also need to implement a way to determine whether a given number is [abundant](#abundant) or [deficient](#deficient). [nicomachus]: https://en.wikipedia.org/wiki/Nicomachus [aliquot-sum]: https://en.wikipedia.org/wiki/Aliquot_sum diff --git a/exercises/practice/pythagorean-triplet/.meta/config.json b/exercises/practice/pythagorean-triplet/.meta/config.json index e0d0ebf3c..6cfac6820 100644 --- a/exercises/practice/pythagorean-triplet/.meta/config.json +++ b/exercises/practice/pythagorean-triplet/.meta/config.json @@ -36,7 +36,7 @@ "build.gradle" ] }, - "blurb": "There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the product a * b * c.", + "blurb": "There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the triplet.", "source": "Problem 9 at Project Euler", "source_url": "https://projecteuler.net/problem=9" } diff --git a/exercises/practice/queen-attack/.docs/instructions.md b/exercises/practice/queen-attack/.docs/instructions.md index ad7ea9547..97f22a0ae 100644 --- a/exercises/practice/queen-attack/.docs/instructions.md +++ b/exercises/practice/queen-attack/.docs/instructions.md @@ -8,18 +8,14 @@ A chessboard can be represented by an 8 by 8 array. So if you are told the white queen is at `c5` (zero-indexed at column 2, row 3) and the black queen at `f2` (zero-indexed at column 5, row 6), then you know that the set-up is like so: -```text - a b c d e f g h -8 _ _ _ _ _ _ _ _ 8 -7 _ _ _ _ _ _ _ _ 7 -6 _ _ _ _ _ _ _ _ 6 -5 _ _ W _ _ _ _ _ 5 -4 _ _ _ _ _ _ _ _ 4 -3 _ _ _ _ _ _ _ _ 3 -2 _ _ _ _ _ B _ _ 2 -1 _ _ _ _ _ _ _ _ 1 - a b c d e f g h -``` +![A chess board with two queens. Arrows emanating from the queen at c5 indicate possible directions of capture along file, rank and diagonal.](https://assets.exercism.org/images/exercises/queen-attack/queen-capture.svg) You are also able to answer whether the queens can attack each other. In this case, that answer would be yes, they can, because both pieces share a diagonal. + +## Credit + +The chessboard image was made by [habere-et-dispertire][habere-et-dispertire] using LaTeX and the [chessboard package][chessboard-package] by Ulrike Fischer. + +[habere-et-dispertire]: https://exercism.org/profiles/habere-et-dispertire +[chessboard-package]: https://github.com/u-fischer/chessboard diff --git a/exercises/practice/rest-api/.docs/instructions.md b/exercises/practice/rest-api/.docs/instructions.md index cb57f6f43..af223ba4b 100644 --- a/exercises/practice/rest-api/.docs/instructions.md +++ b/exercises/practice/rest-api/.docs/instructions.md @@ -44,5 +44,5 @@ Your task is to implement a simple [RESTful API][restful-wikipedia] that receive [restful-wikipedia]: https://en.wikipedia.org/wiki/Representational_state_transfer [iou]: https://en.wikipedia.org/wiki/IOU [github-rest]: https://developer.github.com/v3/ -[reddit-rest]: https://www.reddit.com/dev/api/ +[reddit-rest]: https://web.archive.org/web/20231202231149/https://www.reddit.com/dev/api/ [restfulapi]: https://restfulapi.net/ diff --git a/exercises/practice/spiral-matrix/.meta/config.json b/exercises/practice/spiral-matrix/.meta/config.json index 3d312af98..e21d2ee57 100644 --- a/exercises/practice/spiral-matrix/.meta/config.json +++ b/exercises/practice/spiral-matrix/.meta/config.json @@ -33,5 +33,5 @@ }, "blurb": "Given the size, return a square matrix of numbers in spiral order.", "source": "Reddit r/dailyprogrammer challenge #320 [Easy] Spiral Ascension.", - "source_url": "https://www.reddit.com/r/dailyprogrammer/comments/6i60lr/20170619_challenge_320_easy_spiral_ascension/" + "source_url": "https://web.archive.org/web/20230607064729/https://old.reddit.com/r/dailyprogrammer/comments/6i60lr/20170619_challenge_320_easy_spiral_ascension/" } diff --git a/exercises/practice/transpose/.meta/config.json b/exercises/practice/transpose/.meta/config.json index 41870770c..5b351d825 100644 --- a/exercises/practice/transpose/.meta/config.json +++ b/exercises/practice/transpose/.meta/config.json @@ -32,5 +32,5 @@ }, "blurb": "Take input text and output it transposed.", "source": "Reddit r/dailyprogrammer challenge #270 [Easy].", - "source_url": "https://www.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text" + "source_url": "https://web.archive.org/web/20230630051421/https://old.reddit.com/r/dailyprogrammer/comments/4msu2x/challenge_270_easy_transpose_the_input_text/" }