2024 Day 4 (#82)

Author: JalonSolov

2024/04/JalonSolov.v

@@ -0,0 +1,56 @@
+import os
+
+// vfmt off
+const deltas = [[-1, 0]!, [1, 0]!, [0, -1]!, [0, 1]!, [-1, -1]!, [-1, 1]!, [1, -1]!, [1, 1]!]!
+// vfmt on
+const lines = os.read_lines('words.input')!
+
+fn word_found(x int, y int, dir int) bool {
+	mut adjusted_x := x
+	mut adjusted_y := y
+
+	for c in 'MAS' {
+		adjusted_x += deltas[dir][0]
+		adjusted_y += deltas[dir][1]
+
+		if adjusted_x < 0 || adjusted_y < 0 || adjusted_x >= lines[0].len || adjusted_y >= lines.len
+			|| lines[adjusted_y][adjusted_x] != c {
+			return false
+		}
+	}
+
+	return true
+}
+
+fn main() {
+	mut xmas := 0
+	mut x_mas := 0
+
+	for y, line in lines {
+		for x, c in line {
+			match c {
+				`X` {
+					for dir in 0 .. deltas.len {
+						if word_found(x, y, dir) {
+							xmas++
+						}
+					}
+				}
+				`A` {
+					if x > 0 && x < line.len - 1 && y > 0 && y < lines.len - 1 {
+						if ((lines[y - 1][x - 1] == `M` && lines[y + 1][x + 1] == `S`)
+							|| (lines[y - 1][x - 1] == `S` && lines[y + 1][x + 1] == `M`))
+							&& ((lines[y - 1][x + 1] == `M` && lines[y + 1][x - 1] == `S`)
+							|| (lines[y - 1][x + 1] == `S` && lines[y + 1][x - 1] == `M`)) {
+							x_mas++
+						}
+					}
+				}
+				else {}
+			}
+		}
+	}
+
+	println('Part 1: ${xmas}')
+	println('Part 2: ${x_mas}')
+}

2024/05/pages.input

@@ -25,4 +25,4 @@
 75,29,13
 75,97,47,61,53
 61,13,29
-97,13,75,29,47
+97,13,75,29,47

known/2024/04/JalonSolov.out

@@ -0,0 +1,2 @@
+Part 1: 18
+Part 2: 9