Difference between revisions of "H-99: Ninety-Nine Haskell Problems"
Line 160: | Line 160: | ||
We simply group equal values together (group), then take the head of each. |
We simply group equal values together (group), then take the head of each. |
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+ | |||
+ | == Problem 9 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
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+ | Example: |
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+ | <example in lisp> |
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+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
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+ | |||
+ | Solution: |
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+ | <haskell> |
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+ | <solution in haskell> |
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+ | </haskell> |
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+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 10 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
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+ | Example: |
||
+ | <example in lisp> |
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+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
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+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 11 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
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+ | Example: |
||
+ | <example in lisp> |
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+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
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+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 12 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 13 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 14 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
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+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 15 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
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+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 16 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 17 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 18 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 19 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 20 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
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+ | |||
+ | == Problem 21 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
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+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 22 == |
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+ | |||
+ | <Problem description> |
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+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 23 == |
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+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 24 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 25 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 26 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 27 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 28 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 29 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 30 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 31 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 32 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 33 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 34 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 35 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 36 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 37 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 38 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 39 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem 40 == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
+ | |||
+ | Example in Haskell: |
||
+ | <example in Haskell> |
||
+ | </pre> |
||
+ | |||
+ | Solution: |
||
+ | <haskell> |
||
+ | <solution in haskell> |
||
+ | </haskell> |
||
+ | |||
+ | <description of implementation> |
||
+ | |||
+ | == Problem n == |
||
+ | |||
+ | <Problem description> |
||
+ | |||
+ | <pre> |
||
+ | Example: |
||
+ | <example in lisp> |
||
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Revision as of 06:05, 12 December 2006
These are Haskell translations of Ninety Nine Lisp Problems.
Problem 1
(*) Find the last box of a list.
Example: * (my-last '(a b c d)) (D)
This is "last" in Prelude, which is defined as:
last :: [a] -> a
last [x] = x
last (_:xs) = last xs
Problem 2
(*) Find the last but one box of a list.
Example: * (my-but-last '(a b c d)) (C D)
This can be done by dropping all but the last two elements of a list:
myButLast :: [a] -> [a]
myButLast list = drop ((length list) - 2) list
Problem 3
(*) Find the K'th element of a list. The first element in the list is number 1.
Example: * (element-at '(a b c d e) 3) C
This is (almost) the infix operator !! in Prelude, which is defined as:
(!!) :: [a] -> Int -> a
(x:_) !! 0 = x
(_:xs) !! n = xs !! (n-1)
Except this doesn't quite work, because !! is zero-indexed, and element-at should be one-indexed. So:
elementAt :: [a] -> Int -> a
elementAt list i = list !! (i-1)
Problem 4
(*) Find the number of elements of a list.
This is "length" in Prelude, which is defined as:
length :: [a] -> Int
length [] = 0
length (_:l) = 1 + length l
Problem 5
(*) Reverse a list.
This is "reverse" in Prelude, which is defined as:
reverse :: [a] -> [a]
reverse = foldl (flip (:)) []
The standard definition is concise, but not very readable. Another way to define reverse is:
reverse :: [a] -> [a]
reverse [] = []
reverse (x:xs) = reverse xs ++ [x]
Problem 6
(*) Find out whether a list is a palindrome. A palindrome can be read forward or backward; e.g. (x a m a x).
This is trivial, because we can use reverse:
isPalindrome :: (Eq a) => [a] -> Bool
isPalindrome xs = xs == (reverse xs)
Problem 7
(**) Flatten a nested list structure.
Transform a list, possibly holding lists as elements into a `flat' list by replacing each list with its elements (recursively).
Example: * (my-flatten '(a (b (c d) e))) (A B C D E)
This is tricky, because lists in Haskell are homogeneous. [1, [2, [3, 4], 5]] is a type error. We have to devise some way of represent a list that may (or may not) be nested:
data NestedList a = Elem a | List [NestedList a]
flatten :: NestedList a -> [a]
flatten (Elem x) = [x]
flatten (List []) = []
flatten (List (x:xs)) = flatten x ++ flatten (List xs)
Our NestedList datatype is either a single element of some type (Elem a), or a list of NestedLists of the same type. (List [NestedList a]). Let's try it out in ghci:
*Main> flatten (Elem 5) [5] *Main> flatten (List [Elem 1, List [Elem 2, List [Elem 3, Elem 4], Elem 5]]) [1,2,3,4,5] *Main> flatten (List []) []
Problem 8
(**) Eliminate consecutive duplicates of list elements.
If a list contains repeated elements they should be replaced with a single copy of the element. The order of the elements should not be changed.
Example: * (compress '(a a a a b c c a a d e e e e)) (A B C A D E) Example in Haskell: *Main> compress ['a','a','a','a','b','c','c','a','a','d','e','e','e','e'] ['a','b','c','a','d','e']
Solution:
compress = map head . group
We simply group equal values together (group), then take the head of each.
Problem 9
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