91 lines
1.6 KiB
Typst
91 lines
1.6 KiB
Typst
#import "/src/utils.typ": *
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#let WALL = "#"
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#let BOX = "O"
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#let BOT = "@"
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#let EMPTY = "."
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#let offsets = (
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"^": (0, -1),
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"<": (-1, 0),
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"v": (0, 1),
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">": (1, 0)
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)
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#let compute-value(grid) = {
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let total = 0
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for (y, row) in grid.enumerate() {
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for (x, type) in row.enumerate() {
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if type == BOX {
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total += y * 100 + x
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}
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}
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}
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return total
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}
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#let solve(input) = {
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let (grid-data, move-data) = input.split("\n\n")
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let grid = grid-data.split("\n").map(r => r.clusters())
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let rows = ()
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let cols = ()
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let w = grid.first().len()
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let h = grid.len()
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let bot-pos = none
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for y in range(h) {
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for x in range(w) {
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let type = grid.at(y).at(x)
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if type == BOT {
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bot-pos = (x, y)
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grid.at(y).at(x) = EMPTY
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break
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}
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}
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if bot-pos != none {
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break
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}
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}
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let (bot-x, bot-y) = bot-pos
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let moves = move-data.replace("\n", "").clusters()
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for (move-i, move) in moves.enumerate() {
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let (dx, dy) = offsets.at(move)
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let (x2, y2) = (bot-x + dx, bot-y + dy)
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let type = grid.at(y2).at(x2)
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if type == WALL {
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continue
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}
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if type == EMPTY {
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(bot-x, bot-y) = (x2, y2)
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continue
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}
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let type2 = type
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let (x3, y3) = (x2, y2)
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while type2 == BOX {
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x3 += dx
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y3 += dy
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type2 = grid.at(y3).at(x3)
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}
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if type2 == WALL {
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continue
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}
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grid.at(y3).at(x3) = BOX
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grid.at(y2).at(x2) = EMPTY
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(bot-x, bot-y) = (x2, y2)
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}
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return compute-value(grid)
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}
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#show-puzzle(
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15, 1,
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solve,
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example: (
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"1": 2028,
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"2": 10092
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)
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) |