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fp:exam2021:l2 [2021/06/03 13:14]
pdmatei 		fp:exam2021:l2 [2021/06/03 15:43] (current)
pdmatei
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 1. (2p) Write a function in Haskell which extracts all **even** positions from a list. Example ''​f [1,2,3,4,5] = [1,​3,​5]''​ 1. (2p) Write a function in Haskell which extracts all **even** positions from a list. Example ''​f [1,2,3,4,5] = [1,​3,​5]''​
  
-2. (2p) Write a function which removes those strings from a list, which are not in the date format. A correct date format is considered: ​''​DD.MM.YYYY'' ​where D,M,Y can be any digit.+2. (2p) Write a function which takes a list of pairs ''​Name-Age''​ and returns ​the average age of names called ​''​Ana''​.
  
 3. (2p) Implement an Algebraic datatype which encodes **semaphores**. A **semaphore** has a color (red, green, yellow). Write a function which checks if a list of semaphores is synchronised (all semaphores have the same color). 3. (2p) Implement an Algebraic datatype which encodes **semaphores**. A **semaphore** has a color (red, green, yellow). Write a function which checks if a list of semaphores is synchronised (all semaphores have the same color).
  
-4. (1p) Suppose  +4. (1p) Consider a 8x8 chessboard which contains only rooks, encoded as a matrix. The presence of a rook on a position is encoded by the character '​R'​. The character ' ' encodes a free position. Write a function which takes a chessboard and returns true if two rooks attack each other.
-Example: +
-<code haskell>​ +
-      .*. +
-img = **. +
-      ... +
-              .*..*..*. +
-              **.**.**. +
-              .........  +
-              .*..*..*. +
-tile 3 img =  **.**.**. +
-              ......... +
-              .*..*..*. +
-              **.**.**. +
-              .........+
  
-</​code>​