🎅 2025 Day 12 Complete! 🎄

2025/day12/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	fmt.Println()
+	part2(inp)
+}
+
+func part1(inp []string) {
+	p, r := parseInput(inp)
+
+	var acc int
+	for i := range r {
+		area := r[i].x * r[i].y
+		size := 0
+		for j := range r[i].req {
+			size += r[i].req[j] * p[j].area
+		}
+		if area > size {
+			acc++
+		}
+	}
+	fmt.Println("Part 1")
+	fmt.Println(p)
+	fmt.Println(acc)
+}
+
+func part2(inp []string) {
+}
+
+type Region struct {
+	x, y int
+	req  []int
+}
+type Present struct {
+	area int
+}
+
+func BuildPresent(inp []string) Present {
+	area := 0
+	for _, row := range inp {
+		area += bytes.Count([]byte(row), []byte{'#'})
+	}
+	return Present{area: area}
+}
+
+func parseInput(inp []string) ([]Present, []Region) {
+	// All presents are 3x3, we have 6 of them
+	var presents []Present
+	var regions []Region
+	for i := 0; i < 30; i += 5 {
+		if len(presents) == 6 {
+			break
+		}
+		presents = append(presents, BuildPresent(inp[i+1:i+4]))
+	}
+
+	for i := 30; i < len(inp); i++ {
+		// Parse regions
+		r := Region{}
+		var p0, p1, p2, p3, p4, p5 int
+		fmt.Sscanf(
+			inp[i], "%dx%d: %d %d %d %d %d %d",
+			&r.x, &r.y, &p0, &p1, &p2, &p3, &p4, &p5,
+		)
+		r.req = []int{p0, p1, p2, p3, p4, p5}
+		regions = append(regions, r)
+	}
+	return presents, regions
+}