progress.yaml

@@ -3,6 +3,4 @@
 2:
   stars: 2
 3:
-  stars: 2
-4:
   stars: 2

res/examples/day4.txt

@@ -1,10 +0,0 @@
-MMMSXXMASM
-MSAMXMSMSA
-AMXSXMAAMM
-MSAMASMSMX
-XMASAMXAMM
-XXAMMXXAMA
-SMSMSASXSS
-SAXAMASAAA
-MAMMMXMMMM
-MXMXAXMASX

src/day4/puzzle1.typ

@@ -1,57 +0,0 @@
-#import "/src/utils.typ": *
-
-#let check-xmas(lines, ox, oy) = {
-  let w = lines.first().len()
-  let h = lines.len()
-
-  let total = 0
-  for dy in (-1, 0, 1) {
-    for dx in (-1, 0, 1) {
-      if dx == 0 and dy == 0 {
-        continue
-      }
-      let buffer = ""
-      let x = ox
-      let y = oy
-      for i in range(4) {
-        buffer += lines.at(y).at(x)
-        x += dx
-        y += dy
-        if (
-          not "XMAS".starts-with(buffer) or
-          x < 0 or x >= w or
-          y < 0 or y >= h
-        ) {
-          break
-        }
-      }
-      if buffer == "XMAS" {
-        total += 1
-      }
-    }
-  }
-  return total
-}
-
-#let solve(input) = {
-  let lines = input.split("\n")
-  let w = lines.first().len()
-  let h = lines.len()
-
-  let total = 0
-  for y in range(h) {
-    for x in range(w) {
-      if lines.at(y).at(x) == "X" {
-        total += check-xmas(lines, x, y)
-      }
-    }
-  }
-
-  return total
-}
-
-#show-puzzle(
-  4, 1,
-  solve,
-  example: 18
-)

src/day4/puzzle2.typ

@@ -1,33 +0,0 @@
-#import "/src/utils.typ": *
-
-#let solve(input) = {
-  let lines = input.split("\n")
-  let w = lines.first().len()
-  let h = lines.len()
-
-  let perms = (("M", "S"), ("S", "M"))
-  let total = 0
-  for y in range(1, h - 1) {
-    for x in range(1, w - 1) {
-      if lines.at(y).at(x) == "A" {
-        let tl = lines.at(y - 1).at(x - 1)
-        let tr = lines.at(y - 1).at(x + 1)
-        let bl = lines.at(y + 1).at(x - 1)
-        let br = lines.at(y + 1).at(x + 1)
-        let tlbr = (tl, br)
-        let bltr = (bl, tr)
-        if tlbr in perms and bltr in perms {
-          total += 1
-        }
-      }
-    }
-  }
-
-  return total
-}
-
-#show-puzzle(
-  4, 2,
-  solve,
-  example: 9
-)