2024 day 8 Complete!

2024/day08/input

@@ -0,0 +1,50 @@
+............s...............1.....................
+......................E......3.....S..............
+.......................3.....S....................
+...e........T.t.......S.1...........I.............
+..................B..................I.....O......
+g.......z........i39......B..I....................
+.......s....S.......3......................i..I...
+....e.............2..........B....................
+.......tC...z.......g......1......................
+.E......s....R....................................
+..G...t..........2................................
+.........K...C.......2............................
+....T..e...........5...C..........................
+...T................................O...o.........
+...............................g..............o...
+.........z...................g......i............o
+...9.E............H...........Y.......O...........
+..........R..H...............7.O..................
+...........H.............v......7........B........
+..9.Q.......................W......1........Y.....
+.........................z.7.................Y....
+.....Q................................v...........
+....K.......E.....R...............2..........o....
+.n............H......v...........................Y
+.G.y..........................Q...................
+......G....A5.....................h...............
+..........D...5.w...9.............................
+......n....5...L..................................
+............................v.....................
+............L...0t..........7.....................
+..n....k............y....................W........
+..k..........0.........................W..........
+...n.......R..L..a........................W.......
+.........................................h........
+..0..L........c...b...............................
+.....................8.y..........................
+.......w.................6.............h.......N..
+..........y..4....................................
+...0....8...k.....Z........r......................
+..............a...8Z.........G......4.............
+........4..b.q.....................K..............
+.q...........kZ.K......b..D.........d.............
+.8.....................D................r.........
+.....w.........a...............d........A.........
+................................d.A.hV............
+................c..........D.....V....r...........
+.......Z......6.....l........................A.d..
+...................l..6..c....b......r...........N
+......a....4........q..l..V..c................N...
+l.....w...........q..6............V...............

2024/day08/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	fmt.Println()
+	part2(inp)
+}
+
+func part1(inp []string) {
+	c := h.StringSliceToCoordByteMap(inp)
+	anC := h.StringSliceToCoordByteMap(inp)
+	nodes := c.FindAllNot('.')
+	for k, bt := range nodes {
+		fNodes := c.FindAll(bt)
+		for _, nd := range fNodes {
+			if k.Equals(nd) {
+				continue
+			}
+			diff := k.Sub(nd)
+			an := k.Add(diff)
+			if anC.ContainsCoord(an) {
+				anC.Put(k.Add(diff), '#')
+			}
+		}
+	}
+	fmt.Println("# Part 1")
+	fmt.Println("Antinodes:", anC.Count('#'))
+}
+
+func part2(inp []string) {
+	c := h.StringSliceToCoordByteMap(inp)
+	anC := h.StringSliceToCoordByteMap(inp)
+	nodes := c.FindAllNot('.')
+	for k, bt := range nodes {
+		fNodes := c.FindAll(bt)
+		for _, nd := range fNodes {
+			anC.Put(nd, '#')
+			anC.Put(k, '#')
+			if k.Equals(nd) {
+				continue
+			}
+			diff := k.Sub(nd)
+			an := k.Add(diff)
+			for anC.ContainsCoord(an) {
+				anC.Put(an, '#')
+				an = an.Add(diff)
+			}
+		}
+	}
+	fmt.Println("# Part 2")
+	fmt.Println("Antinodes:", anC.Count('#'))
+}

2024/day08/testinput

@@ -0,0 +1,12 @@
+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............

2024/day08/testinput2

@@ -0,0 +1,10 @@
+T.........
+...T......
+.T........
+..........
+..........
+..........
+..........
+..........
+..........
+..........

helpers/coordinate.go

@@ -42,6 +42,13 @@ func (c *Coordinate) MoveNW() {
 	c.Y--
 }
 
+func (c Coordinate) Sub(o Coordinate) Coordinate {
+	return Coordinate{
+		X: c.X - o.X,
+		Y: c.Y - o.Y,
+	}
+}
+
 func (c Coordinate) Add(o Coordinate) Coordinate {
 	return Coordinate{
 		X: c.X + o.X,