Created
January 14, 2017 02:16
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| import Prelude((<),(+),(-),($)) | |
| import qualified Prelude as P | |
| import qualified Data.List as L | |
| import qualified Data.Set as S | |
| data Event = Add | Remove deriving (P.Eq,P.Ord,P.Show) | |
| events li = L.sort $ L.concat $ L.map (\(x,y,k) -> [(x,Add,k),(y,Remove,k)]) li | |
| process ((st,stv,stk):events) = L.map (\(a,b,c) -> (a, b, S.toList c)) $ L.reverse res | |
| where (_,_,res) = L.foldl step (S.singleton stk,st,[]) events | |
| step (active, startTime, res) (time, ev, evk) = (next, nextTime, expected) | |
| where | |
| endTime = case ev of | |
| Add -> time - 1 | |
| Remove -> time | |
| next = case ev of | |
| Add -> S.insert evk active | |
| Remove -> S.delete evk active | |
| expected = if startTime < endTime | |
| then (startTime, endTime, active) : res | |
| else res | |
| nextTime = endTime + 1 | |
| skipList = | |
| [ (100, 200, 'A') | |
| , (201, 300, 'B') | |
| , ( 20, 400, 'C') | |
| , (125, 150, 'D') | |
| , (151, 250, 'E') | |
| ] | |
| expected = | |
| [ ( 20, 99, ['C']) | |
| , (100, 124, ['A','C']) | |
| , (125, 150, ['A','C','D']) | |
| , (151, 200, ['A','C','E']) | |
| , (201, 250, ['B','C','E']) | |
| , (251, 300, ['B','C']) | |
| , (301, 400, ['C']) | |
| ] | |
| calculated = process $ events $ skipList |
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