diff options
| -rw-r--r-- | 2020/18.hs | 39 | ||||
| -rw-r--r-- | 2020/18.in | 377 |
2 files changed, 416 insertions, 0 deletions
diff --git a/2020/18.hs b/2020/18.hs new file mode 100644 index 0000000..e77ea48 --- /dev/null +++ b/2020/18.hs @@ -0,0 +1,39 @@ +module Main where + +import Text.Parsec hiding (getInput) +import Text.Parsec.Expr + +import Input + + +data Expr = Expr :+ Expr | Expr :* Expr | Lit Int + deriving (Show) + +eval :: Expr -> Int +eval (a :+ b) = eval a + eval b +eval (a :* b) = eval a * eval b +eval (Lit n) = n + +type Parser = Parsec String () + +data Part = Part1 | Part2 + +parseExpr :: Part -> String -> Expr +parseExpr part = either (error . show) id . parse pExpr "" + where + pExpr = buildExpressionParser (table part) pTerm + table Part1 = [[Infix (pOpers [pOperPlus, pOperMul]) AssocLeft]] + table Part2 = [[Infix (pOpers [pOperPlus]) AssocLeft] + ,[Infix (pOpers [pOperMul]) AssocLeft]] + pTerm = try (spaces >> ((Lit <$> pNum) <|> pParens)) + pNum = read <$> many1 digit + pParens = between (char '(') (char ')') pExpr + pOpers os = try (spaces >> choice os) :: Parser (Expr -> Expr -> Expr) + pOperPlus = (:+) <$ char '+' + pOperMul = (:*) <$ char '*' + +main :: IO () +main = do + input <- getInput 18 + print (sum (map (eval . parseExpr Part1) input)) + print (sum (map (eval . parseExpr Part2) input)) diff --git a/2020/18.in b/2020/18.in new file mode 100644 index 0000000..4fd2cf6 --- /dev/null +++ b/2020/18.in @@ -0,0 +1,377 @@ +9 + 4 + (3 + (6 * 5 + 9 * 2 * 4) * 9) +((7 + 6) + 2 * 6 + 4 * 2 + 9) * 6 + 5 +7 * 3 * 9 * 6 + (4 + 2 + 4 * 9) + 7 +9 + (9 * 3 * 3 * (9 + 5 + 4) + 4) +(8 * 5 + (7 + 5 + 3 + 6) * 9 + 7 * (9 * 8 + 7 * 2)) * 8 +3 + (6 * 2 * (9 + 2 + 5) * (9 * 2 * 6 + 8 * 5) * (2 + 2 + 3 + 7 * 9)) + 4 * 4 + (6 * 4 * (9 + 4) + 8 * 3 * (5 + 3)) * 5 +2 * 8 * (8 * 2 * 4) + (9 * 3 * 6) * 9 +2 + (8 * 4 * 9 * 3 + 8 * 2) + 4 * 9 * 6 +((6 * 4 + 9 + 5 * 7 + 3) * 4 + 8 * (3 + 6 + 9 * 9) + 9 * 6) + (7 * 7) + 6 * 2 * 2 +2 + 5 * 3 +2 + 6 * (8 + 6 * 5 + (3 * 9) + 3) +3 + 2 * 4 + 9 * 4 + 9 +(7 + 5 + (4 + 7)) * (4 + 4 * 9) + 4 * 7 + 9 * 4 +8 + 5 * (3 + 3 + 8 + (4 + 3 * 4 + 3 * 4)) + (8 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