2023 day 10

2023/10/part2/cmd/main.go

@@ -0,0 +1,18 @@
+
+package main
+
+import (
+	"git.tristans.cloud/tristan/aoc/2023/10/part1/lib"
+	"git.tristans.cloud/tristan/aoc/2023/10/part2/lib"
+	"bufio"
+	"os"
+)
+
+func main () {
+	scanner := bufio.NewScanner(os.Stdin);
+
+	pipeMap := part1.ReadMap(scanner)
+	inside := part2.GetVolume(pipeMap)
+	println(inside)
+}
+

2023/10/part2/lib/lib.go

@@ -0,0 +1,84 @@
+
+package part2
+
+import (
+	"git.tristans.cloud/tristan/aoc/2023/10/part1/lib"
+	"fmt"
+)
+
+type Loop map[[2]int]bool
+
+func GetLoop(pipeMap []string) ( loop Loop ) {
+	x,y := part1.FindStart(pipeMap)
+	loop = Loop{{x,y}: true}
+	side,x,y := part1.FindFirst(pipeMap, x,y)
+	for pipeMap[y][x] != 'S' {
+		loop[[2]int{x,y}] = true
+		side,x,y = part1.FindNext(pipeMap, side, x,y)
+	}
+	return
+}
+
+func GetShapeOfS(pipeMap []string) () {
+	return 
+}
+
+const CLEAR = "\u001b[0;0m";
+const OUT_OF_LOOP = CLEAR;
+const ON_LOOP = "\u001b[0;31m";
+const IN_LOOP = "\u001b[0;33m";
+
+func GetVolume(pipeMap []string) int {
+	loop := GetLoop(pipeMap)
+	count := 0
+	for y,line := range pipeMap {
+		inLoop := false
+		onDownEdge := false
+		onUpEdge := false
+		for x,c := range line {
+			_,onLoop := loop[[2]int{x,y}]
+
+			if onLoop {
+				switch c {
+				case '|':
+					inLoop = !inLoop
+				case 'L':
+					onDownEdge = true
+				case 'F':
+					onUpEdge = true
+				case '7':
+					if onDownEdge {
+						onDownEdge = false
+						inLoop = !inLoop
+					} else if onUpEdge {
+						onUpEdge = false
+					}
+				case 'J':
+					if onUpEdge {
+						onUpEdge = false
+						inLoop = !inLoop
+					} else if onDownEdge {
+						onDownEdge = false
+					}
+
+				}
+
+			}
+			color := OUT_OF_LOOP
+			if onLoop {
+				color = ON_LOOP
+			}
+			if inLoop && !onLoop {
+				count++
+				color = IN_LOOP
+			}
+			if c == 'S' {
+				color = "\u001b[41;30m"
+			}
+			fmt.Printf("%v%c", color, c)
+		}
+		println(CLEAR)
+	}
+	return count
+}
+

2023/10/part2/lib/lib_test.go

@@ -0,0 +1,88 @@
+
+package part2
+
+import (
+	"testing"
+	"reflect"
+)
+
+var inputMap = []string{
+	"...........",
+	".S-------7.",
+	".|F-----7|.",
+	".||.....||.",
+	".||.....||.",
+	".|L-7.F-J|.",
+	".|..|.|..|.",
+	".L--J.L--J.",
+	"...........",
+}
+
+var complexMap = []string{
+	"FF7FSF7F7F7F7F7F---7",
+	"L|LJ||||||||||||F--J",
+	"FL-7LJLJ||||||LJL-77",
+	"F--JF--7||LJLJ7F7FJ-",
+	"L---JF-JLJ.||-FJLJJ7",
+	"|F|F-JF---7F7-L7L|7|",
+	"|FFJF7L7F-JF7|JL---7",
+	"7-L-JL7||F7|L7F-7F7|",
+	"L.L7LFJ|||||FJL7||LJ",
+	"L7JLJL-JLJLJL--JLJ.L",
+}
+
+var anotherMap = []string{
+	".F----7F7F7F7F-7....",
+	".|F--7||||||||FJ....",
+	".||.FJ||||||||L7....",
+	"FJL7L7LJLJ||LJ.L-7..",
+	"L--J.L7...LJS7F-7L7.",
+	"....F-J..F7FJ|L7L7L7",
+	"....L7.F7||L7|.L7L7|",
+	".....|FJLJ|FJ|F7|.LJ",
+	"....FJL-7.||.||||...",
+	"....L---J.LJ.LJLJ...",
+}
+
+var basicMap = []string{
+	".....",
+	".S-7.",
+	".|.|.",
+	".L-J.",
+	".....",
+}
+
+func TestGetLoop(t *testing.T) {
+	loop := GetLoop(basicMap)
+	equal(t, loop, Loop{
+		{1,1}:true,
+		{2,1}:true,
+		{3,1}:true,
+		{3,2}:true,
+		{3,3}:true,
+		{2,3}:true,
+		{1,3}:true,
+		{1,2}:true,
+	})
+}
+
+func TestGetVolume(t *testing.T) {
+	v := GetVolume(inputMap)
+	equal(t, v, 4)
+}
+
+func TestGetVolumeComplex(t *testing.T) {
+	v := GetVolume(complexMap)
+	equal(t, v, 10)
+}
+
+func TestGetVolumeAgain(t *testing.T) {
+	v := GetVolume(anotherMap)
+	equal(t, v, 8)
+}
+
+func equal(t *testing.T, actual any, target any) {
+	if !reflect.DeepEqual(actual, target) {
+		t.Errorf("expected %v, got %v", target, actual)
+	}
+}