-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathday-16.roc
251 lines (202 loc) · 7.82 KB
/
day-16.roc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
app "day-16"
packages {
pf: "https://github.com/roc-lang/basic-cli/releases/download/0.7.0/bkGby8jb0tmZYsy2hg1E_B2QrCgcSTxdUlHtETwm5m4.tar.br",
array2d: "https://github.com/mulias/roc-array2d/releases/download/v0.1.0/ssMT0bDIv-qE7d_yNUyCByGQHvpNkQJZsGUS6xEFsIY.tar.br",
}
imports [
pf.Stdout,
pf.Task.{ Task },
pf.Utc,
"inputs/day-16.txt" as inputData : Str,
array2d.Array2D.{ Array2D, Index },
]
provides [main] to pf
main : Task {} *
main =
start <- Task.await Utc.now
result = howManyTilesAreEnergized inputData
end <- Task.await Utc.now
_ <- Task.await (Stdout.line "result \(Num.toStr result)")
Stdout.line "delta \(Num.toStr (Utc.deltaAsMillis start end))"
howManyTilesAreEnergized = \input ->
array2D =
input
|> Str.trim
|> Str.split "\n"
|> List.map Str.toUtf8
|> Array2D.fromLists FitShortest
|> Array2D.transpose
{ dimX, dimY } = Array2D.shape array2D
top =
List.range { start: At 0, end: Before dimX }
|> List.map \a ->
(
Set.single ({ x: a, y: 0 }, Down),
[(Ok { x: a, y: 0 }, Down)],
)
right =
List.range { start: At 0, end: Before dimY }
|> List.map \a ->
(
Set.single ({ x: dimX - 1, y: a }, Left),
[(Ok { x: dimX - 1, y: a }, Left)],
)
down =
List.range { start: At 0, end: Before dimX }
|> List.map \a ->
(
Set.single ({ x: a, y: dimY - 1 }, Up),
[(Ok { x: a, y: dimY - 1 }, Up)],
)
left =
List.range { start: At 0, end: Before dimY }
|> List.map \a ->
(
Set.single ({ x: 0, y: a }, Right),
[(Ok { x: 0, y: a }, Right)],
)
[top, right, down, left]
|> List.join
|> List.walk 0 \state, a ->
x = loopidiloop array2D a.0 a.1
if x > state then x else state
Direction : [Up, Right, Down, Left]
loopidiloop : Array2D U8, Set (Index, Direction), List ([Ok Index, Yolo], Direction) -> Nat
loopidiloop = \array2D, energizedTiles, stack ->
move = \(t, s), movements ->
movements
|> List.walk (t, s) \state, (i, d) ->
ni = moveInDirection array2D d i
when ni is
Ok nni ->
if Set.contains state.0 (nni, d) then
state
else
(
Set.insert state.0 (nni, d),
List.append state.1 (ni, d),
)
Yolo -> state
when stack is
[] ->
energizedTiles
|> Set.walk (Set.empty {}) \state, k -> Set.insert state k.0
|> Set.len
[.., (Yolo, direction)] ->
newStack = List.dropIf stack \a -> a.0 == Yolo
loopidiloop array2D energizedTiles newStack
[.., (Ok index, direction)] ->
# move in direction will break like if x is 0 and moving left
when Array2D.get array2D index is
Ok '.' ->
(tiles, newStack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, direction)]
loopidiloop array2D tiles newStack
Ok '|' ->
if direction == Up || direction == Down then
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, direction)]
loopidiloop array2D tiles newstack
else
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Up), (index, Down)]
loopidiloop array2D tiles newstack
Ok '-' ->
if direction == Left || direction == Right then
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, direction)]
loopidiloop array2D tiles newstack
else
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Left), (index, Right)]
loopidiloop array2D tiles newstack
Ok '\\' ->
when direction is
Up ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Left)]
loopidiloop array2D tiles newstack
Right ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Down)]
loopidiloop array2D tiles newstack
Down ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Right)]
loopidiloop array2D tiles newstack
Left ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Up)]
loopidiloop array2D tiles newstack
Ok '/' ->
when direction is
Up ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Right)]
loopidiloop array2D tiles newstack
Right ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Up)]
loopidiloop array2D tiles newstack
Down ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Left)]
loopidiloop array2D tiles newstack
Left ->
(tiles, newstack) =
(energizedTiles, List.dropLast stack 1)
|> move [(index, Down)]
loopidiloop array2D tiles newstack
_ ->
crash "yolo \(Num.toStr index.x), \(Num.toStr index.y))"
moveInDirection : Array2D U8, Direction, Index -> [Ok Index, Yolo]
moveInDirection = \array2D, direction, { x, y } ->
when direction is
Up ->
if y == 0 then
Yolo
else
Ok { x, y: y - 1 }
Right ->
if x >= (Array2D.shape array2D).dimX - 1 then
Yolo
else
Ok { y, x: x + 1 }
Down ->
if y >= (Array2D.shape array2D).dimY - 1 then
Yolo
else
Ok { x, y: y + 1 }
Left ->
if x == 0 then
Yolo
else
Ok { y, x: x - 1 }
expect
input =
"""
.|...\\....
|.-.\\.....
.....|-...
........|.
..........
.........\\
..../.\\\\..
.-.-/..|..
.|....-|.\\
..//.|....
"""
result = howManyTilesAreEnergized input
result == 46