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Day18.roc
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interface Day18 exposes [ output ] imports [ ListZip, TestUtil ]
output : List I64 -> List (List I64)
output = \puzzleInput ->
testData1 = parseData testInput1
testData2 = parseData testInput2
testData3 = parseData testInput3
testData4 = parseData testInput4
testData5 = parseData testInput5
testData6 = parseData testInput6
puzzleData = parseData puzzleInput
[ TestUtil.verify 18 1 1 (firstResult testData1 ) 71
, TestUtil.verify 18 1 2 (firstResult testData2 ) 51
, TestUtil.verify 18 1 3 (firstResult testData3 ) 26
, TestUtil.verify 18 1 4 (firstResult testData4 ) 437
, TestUtil.verify 18 1 5 (firstResult testData5 ) 12240
, TestUtil.verify 18 1 6 (firstResult testData6 ) 13632
, TestUtil.show 18 1 (firstResult puzzleData)
, TestUtil.verify 18 2 1 (secondResult testData1 ) 231
, TestUtil.verify 18 2 2 (secondResult testData2 ) 51
, TestUtil.verify 18 2 3 (secondResult testData3 ) 46
, TestUtil.verify 18 2 4 (secondResult testData4 ) 1445
, TestUtil.verify 18 2 5 (secondResult testData5 ) 669060
, TestUtil.verify 18 2 6 (secondResult testData6 ) 23340
, TestUtil.show 18 2 (secondResult puzzleData)
]
# first part
firstResult : List (List I64) -> I64
firstResult = \lines ->
List.map lines eval |> List.sum
eval : List I64 -> I64
eval = \input ->
if List.len input > 0 then
zip = ListZip.newAtFirst input 0
evalHelper input zip [] -1
else
0
# | ( -> (
# | + -> +
# | * -> *
# ( | n -> n
# m + | n -> (m+n)
# m * | n -> (m*n)
# | n -> n
# m + n | ) -> (m+n)
# m * n | ) -> (m*n)
# n | ) -> n
evalHelper : List I64, ListZip.Zip, List I64, I64 -> I64
evalHelper = \input, zip, stack, sp ->
newZip = ListZip.forward zip input
if zip.val < 0 then
newSp = sp + 1
newStack = setStack stack newSp zip.val
evalHelper input newZip newStack newSp
else
val =
if zip.val > 0 then
zip.val
else
getStack stack sp
opSp =
if zip.val > 0 then
sp
else
sp - 1
if opSp < 0 then
val
else
when getStack stack opSp is
-2 ->
newSp = opSp - 1
newStack = setStack stack newSp (val * (getStack stack newSp))
evalHelper input newZip newStack newSp
-3 ->
newSp = opSp - 1
newStack = setStack stack newSp (val + (getStack stack newSp))
evalHelper input newZip newStack newSp
_ ->
newStack = setStack stack opSp val
evalHelper input newZip newStack opSp
# second part
secondResult : List (List I64) -> I64
secondResult = \lines ->
List.map lines eval2 |> List.sum
eval2 : List I64 -> I64
eval2 = \input ->
if List.len input > 0 then
zip = ListZip.newAtFirst input 0
eval2Helper input zip [] -1
else
0
# | ( -> (
# | + -> +
# m * n | * -> (m*n) *
# | * -> *
# m + | n -> (m+n)
# | n -> n
# o + ( m * n | ) -> (o+(m*n))
# m + ( n | ) -> (m+n)
# ( m * n | ) -> (m*n)
# ( n | ) -> n
eval2Helper : List I64, ListZip.Zip, List I64, I64 -> I64
eval2Helper = \input, zip, stack, sp ->
newZip = ListZip.forward zip input
if zip.val == -2 then
opSp = sp - 1
if getStack stack opSp == -2 then
resSp = opSp - 1
newStack = setStack stack resSp (getStack stack resSp * getStack stack sp)
eval2Helper input newZip newStack opSp
else
newSp = sp + 1
newStack = setStack stack newSp zip.val
eval2Helper input newZip newStack newSp
else if zip.val < 0 then
newSp = sp + 1
newStack = setStack stack newSp zip.val
eval2Helper input newZip newStack newSp
else if zip.val > 0 then
if getStack stack sp == -3 then
newSp = sp - 1
newStack = setStack stack newSp (zip.val + (getStack stack newSp))
eval2Helper input newZip newStack newSp
else
newSp = sp + 1
newStack = setStack stack newSp zip.val
eval2Helper input newZip newStack newSp
else
val1 = getStack stack sp
opSp1 = sp - 1
val2 =
if getStack stack opSp1 == -2 then
val1 * getStack stack (opSp1 - 1)
else
val1
opSp2 =
if getStack stack opSp1 == -2 then
opSp1 - 3
else
opSp1 - 1
if opSp2 < 0 then
val2
else if getStack stack opSp2 == -3 then
newSp = opSp2 - 1
newStack = setStack stack newSp (val2 + (getStack stack newSp))
eval2Helper input newZip newStack newSp
else
newSp = opSp2 + 1
newStack = setStack stack newSp val2
eval2Helper input newZip newStack newSp
# utils
getStack : List I64, I64 -> I64
getStack = \stack, idx ->
when List.get stack idx is
Ok val -> val
_ -> 0
setStack : List I64, I64, I64 -> List I64
setStack = \stack, idx, val ->
if idx < List.len stack then
List.set stack idx val
else
setStack (List.append stack 0) idx val
# parser
parseData : List I64 -> List (List I64)
parseData = \input ->
parseDataHelper input (ListZip.newAtFirst input 0) 0 [ -1 ] [ [] ]
parseDataHelper : List I64, ListZip.Zip, I64, List I64, List (List I64) -> List (List I64)
parseDataHelper = \input, zip, num, line, result ->
if ListZip.afterLast zip then
newLine =
if num > 0 then
List.append line num
else
line
List.join [ result, [ List.append newLine 0 ] ]
else
newZip = ListZip.forward zip input
if 48 <= zip.val && zip.val <= 57 then
parseDataHelper input newZip (10 * num + zip.val - 48) line result
else
newLine =
if num > 0 then
List.append line num
else
line
when zip.val is
10 -> parseDataHelper input newZip 0 [ -1 ] (List.join [ result, [ List.append newLine 0 ] ])
40 -> parseDataHelper input newZip 0 (List.append newLine -1) result
41 -> parseDataHelper input newZip 0 (List.append newLine 0) result
42 -> parseDataHelper input newZip 0 (List.append newLine -2) result
43 -> parseDataHelper input newZip 0 (List.append newLine -3) result
_ -> parseDataHelper input newZip 0 newLine result
# test data
testInput1 : List I64
testInput1 =
[ 49, 32, 43, 32, 50, 32, 42, 32, 51, 32, 43, 32, 52, 32, 42, 32, 53, 32, 43
, 32, 54
]
testInput2 : List I64
testInput2 =
[ 49, 32, 43, 32, 40, 50, 32, 42, 32, 51, 41, 32, 43, 32, 40, 52, 32, 42, 32
, 40, 53, 32, 43, 32, 54, 41, 41
]
testInput3 : List I64
testInput3 =
[ 50, 32, 42, 32, 51, 32, 43, 32, 40, 52, 32, 42, 32, 53, 41 ]
testInput4 : List I64
testInput4 =
[ 53, 32, 43, 32, 40, 56, 32, 42, 32, 51, 32, 43, 32, 57, 32, 43, 32, 51, 32
, 42, 32, 52, 32, 42, 32, 51, 41
]
testInput5 : List I64
testInput5 =
[ 53, 32, 42, 32, 57, 32, 42, 32, 40, 55, 32, 42, 32, 51, 32, 42, 32, 51, 32
, 43, 32, 57, 32, 42, 32, 51, 32, 43, 32, 40, 56, 32, 43, 32, 54, 32, 42, 32
, 52, 41, 41
]
testInput6 : List I64
testInput6 =
[ 40, 40, 50, 32, 43, 32, 52, 32, 42, 32, 57, 41, 32, 42, 32, 40, 54, 32, 43
, 32, 57, 32, 42, 32, 56, 32, 43, 32, 54, 41, 32, 43, 32, 54, 41, 32, 43, 32
, 50, 32, 43, 32, 52, 32, 42, 32, 50
]