Difference between revisions of "H-99: Ninety-Nine Haskell Problems"
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| + | __NOTOC__ |
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| − | == Problem 1 == |
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| + | which are themselves translations of [https://web.archive.org/web/20170324220754/https://sites.google.com/site/prologsite/prolog-problems Ninety-Nine Prolog Problems]. |
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| + | If you want to work on one of these, put your name in the block so we know someone's working on it. Then, change n in your block to the appropriate problem number, and fill in the <Problem description>,<example in Haskell>,<solution in haskell> and <description of implementation> fields. Then be sure to update the status on this page to indicate that we have a solution! |
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| − | <pre> |
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| − | (*) Find the last box of a list. |
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| − | Example: |
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| − | * (my-last '(a b c d)) |
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| − | (D) |
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| − | </pre> |
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| + | == The problems == |
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| − | This is "last" in Prelude, which is defined as: |
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| + | These problems have been split into 11 parts, for ease of access. |
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| − | <haskell> |
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| − | last :: [a] -> a |
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| − | last [x] = x |
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| − | last (_:xs) = last xs |
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| − | </haskell> |
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| + | * [[99_questions/1_to_10|Questions 1 to 10]]: Lists |
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| − | == Problem 2 == |
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| + | * [[99_questions/11_to_20|Questions 11 to 20]]: Lists, continued |
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| + | * [[99_questions/21_to_28|Questions 21 to 28]]: Lists again |
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| + | * [[99_questions/31_to_41|Questions 31 to 41]]: Arithmetic |
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| + | * [[99_questions/46_to_50|Questions 46 to 50]]: Logic and codes |
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| + | * [[99_questions/54A_to_60|Questions 54A to 60]]: Binary trees |
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| + | * [[99_questions/61_to_69|Questions 61 to 69]]: Binary trees, continued |
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| + | * [[99_questions/70B_to_73|Questions 70B to 73]]: Multiway trees |
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| + | * [[99_questions/80_to_89|Questions 80 to 89]]: Graphs |
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| + | * [[99_questions/90_to_94|Questions 90 to 94]]: Miscellaneous problems |
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| + | * [[99_questions/95_to_99|Questions 95 to 99]]: Miscellaneous problems, continued |
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| + | (Though the problems number from 1 to 99, there are some gaps and some additions marked with letters. There are actually only 88 problems.) |
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| − | <pre> |
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| − | (*) Find the last but one box of a list. |
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| − | Example: |
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| − | * (my-but-last '(a b c d)) |
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| − | (C D) |
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| − | </pre> |
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| + | == Solutions == |
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| − | This can be done by dropping all but the last two elements of a list: |
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| + | Known solutions are listed at [[99 questions/Solutions]]. Some of those we have could do with cleaning up or additional solutions. |
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| − | <haskell> |
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| + | |||
| − | myButLast :: [a] -> [a] |
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| + | == References == |
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| − | myButLast list = drop ((length list) - 2) list |
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| + | |||
| − | </haskell> |
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| + | * [https://web.archive.org/web/20170324220754/https://sites.google.com/site/prologsite/prolog-problems P-99: Ninety-Nine Prolog Problems] (Wayback Machine; original link now dead) contains Prolog solutions to all the problems. |
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| + | * [http://www.ic.unicamp.br/~meidanis/courses/mc336/2006s2/funcional/L-99_Ninety-Nine_Lisp_Problems.html L-99: Ninety-Nine Lisp Problems] contains Lisp solutions to problems 1-11, 14, 15, 17 and 20-28. |
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| + | * [https://www.perlmonks.org/?node_id=590113 99 Problems in Perl 6] has an increasing number of Perl 6 solutions. |
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| + | * [https://www.ocaml.org/exercises 99 Problems in OCaml] contains Ocaml solutions to many problems. |
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[[Category:Tutorials]] |
[[Category:Tutorials]] |
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| + | [[Category:Code]] |
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Latest revision as of 19:49, 4 January 2024
These are Haskell translations of Ninety-Nine Lisp Problems,
which are themselves translations of Ninety-Nine Prolog Problems.
If you want to work on one of these, put your name in the block so we know someone's working on it. Then, change n in your block to the appropriate problem number, and fill in the <Problem description>,<example in Haskell>,<solution in haskell> and <description of implementation> fields. Then be sure to update the status on this page to indicate that we have a solution!
The problems
These problems have been split into 11 parts, for ease of access.
- Questions 1 to 10: Lists
- Questions 11 to 20: Lists, continued
- Questions 21 to 28: Lists again
- Questions 31 to 41: Arithmetic
- Questions 46 to 50: Logic and codes
- Questions 54A to 60: Binary trees
- Questions 61 to 69: Binary trees, continued
- Questions 70B to 73: Multiway trees
- Questions 80 to 89: Graphs
- Questions 90 to 94: Miscellaneous problems
- Questions 95 to 99: Miscellaneous problems, continued
(Though the problems number from 1 to 99, there are some gaps and some additions marked with letters. There are actually only 88 problems.)
Solutions
Known solutions are listed at 99 questions/Solutions. Some of those we have could do with cleaning up or additional solutions.
References
- P-99: Ninety-Nine Prolog Problems (Wayback Machine; original link now dead) contains Prolog solutions to all the problems.
- L-99: Ninety-Nine Lisp Problems contains Lisp solutions to problems 1-11, 14, 15, 17 and 20-28.
- 99 Problems in Perl 6 has an increasing number of Perl 6 solutions.
- 99 Problems in OCaml contains Ocaml solutions to many problems.