Created
October 21, 2010 01:29
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import Data.Time.Calendar | |
import Control.Monad | |
import Data.List | |
data Person = P { p_id :: Int | |
, name :: String | |
, gender :: Int | |
, age :: Int | |
} deriving (Show, Eq) | |
data Group = G { g_id :: Int | |
, gname :: String | |
} deriving Show | |
data Assginment = A { a_id :: Int | |
, a_p_id :: Int | |
, a_g_id :: Int | |
, date :: Day | |
} deriving Show | |
persons = [ P 1 "Tarou" 1 10 | |
, P 2 "Hanako" 2 20 | |
, P 3 "Jirou" 1 30 | |
, P 4 "Saburou" 1 40] | |
groups = [ G 1 "Matu", G 2 "Take", G 3 "Ume"] | |
assignments = [ A 1 1 1 (fromGregorian 2010 4 1) | |
, A 2 2 1 (fromGregorian 2009 9 1) | |
, A 3 3 2 (fromGregorian 2010 4 1) | |
, A 4 1 2 (fromGregorian 2010 5 1)] | |
main = print $ nub $ do | |
p <- persons | |
a <- assignments | |
guard (p_id p == a_p_id a && | |
case toGregorian (date a) of | |
(y,_,_) -> y == 2010) | |
return p |
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