day 10 puzzle 2

This commit is contained in:
Louis Heredero 2024-12-10 13:27:32 +01:00
parent 2cbd13d224
commit 242eaeb634
Signed by: HEL
GPG Key ID: 8D83DE470F8544E7
4 changed files with 65 additions and 2 deletions

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@ -17,4 +17,4 @@
9:
stars: 2
10:
stars: 1
stars: 2

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@ -1,11 +1,74 @@
#import "/src/utils.typ": *
#let offsets = (
(-1, 0),
(0, -1),
(1, 0),
(0, 1)
)
#let in-grid(w, h, x, y) = {
return 0 <= x and x < w and 0 <= y and y < h
}
#let count-paths(grid, w, h, ox, oy) = {
let in-grid = in-grid.with(w, h)
let rating = 0
let to-visit = ((ox, oy),)
while to-visit.len() != 0 {
let (x, y) = to-visit.remove(0)
let v = grid.at(y).at(x)
let branches = 0
for (dx, dy) in offsets {
let (x2, y2) = (x + dx, y + dy)
if not in-grid(x2, y2) {
continue
}
let v2 = grid.at(y2).at(x2)
if v2 == v + 1 {
let pos2 = (x2, y2)
branches += 1
if v2 != 9 {
to-visit.push(pos2)
}
}
}
rating += if v == 0 {
branches
} else {
branches - 1 // If no branch -> -1
}
}
return rating
}
#let solve(input) = {
let grid = input.split("\n").map(l => l.clusters().map(int))
let w = grid.first().len()
let h = grid.len()
let count-paths = count-paths.with(grid, w, h)
let ratings = ()
let total = 0
for y in range(h) {
for x in range(w) {
if grid.at(y).at(x) == 0 {
let rating = count-paths(x, y)
total += rating
ratings.push(rating)
}
}
}
let a = ratings
return total
}
#show-puzzle(
10, 2,
solve,
example: 0
example: 81
)

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