From 3543f8a117e4639ccab272b51ffec221904b5777 Mon Sep 17 00:00:00 2001
From: mStar <me@mstar.dev>
Date: Tue, 10 Dec 2024 22:27:41 +0100
Subject: [PATCH] And day 10 done. Once again, easy af

---
 day10/main.go | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)

diff --git a/day10/main.go b/day10/main.go
index 06ab7d0..bb17ad1 100644
--- a/day10/main.go
+++ b/day10/main.go
@@ -1 +1,115 @@
 package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"git.mstar.dev/mstar/goutils/other"
+	"git.mstar.dev/mstar/goutils/sliceutils"
+
+	"git.mstar.dev/mstar/aoc24/util"
+)
+
+type Map [][]int //Y, X
+
+type Coordinate struct {
+	X, Y int
+}
+
+func parseLinesToMap(lines []string) Map {
+	return sliceutils.Map(lines, func(t string) []int {
+		return sliceutils.Map(
+			strings.Split(t, ""),
+			func(t string) int { return other.Must(strconv.Atoi(t)) },
+		)
+	})
+}
+
+func findStartingPositions(area Map) (coords []Coordinate) {
+	coords = []Coordinate{}
+	for iy, line := range area {
+		for ix, height := range line {
+			if height == 0 {
+				coords = append(coords, Coordinate{ix, iy})
+			}
+		}
+	}
+	return
+}
+
+func (m Map) get(x, y int) int {
+	if y < 0 || y >= len(m) || x < 0 || x >= len(m[0]) {
+		return 0
+	}
+	return m[y][x]
+}
+
+func findNextValidCoords(area Map, currentLevel int, nextTo Coordinate) (coords []Coordinate) {
+	coords = []Coordinate{}
+	if area.get(nextTo.X+1, nextTo.Y) == currentLevel+1 {
+		coords = append(coords, Coordinate{nextTo.X + 1, nextTo.Y})
+	}
+	if area.get(nextTo.X-1, nextTo.Y) == currentLevel+1 {
+		coords = append(coords, Coordinate{nextTo.X - 1, nextTo.Y})
+	}
+	if area.get(nextTo.X, nextTo.Y+1) == currentLevel+1 {
+		coords = append(coords, Coordinate{nextTo.X, nextTo.Y + 1})
+	}
+	if area.get(nextTo.X, nextTo.Y-1) == currentLevel+1 {
+		coords = append(coords, Coordinate{nextTo.X, nextTo.Y - 1})
+	}
+	fmt.Printf("Next valid coords for %d at %v: %v\n", currentLevel, nextTo, coords)
+	return
+}
+
+func traverseFromCoord(area Map, start Coordinate) []Coordinate {
+	currentLevel := area[start.Y][start.X]
+	fmt.Printf("Traversing from level %d at %v\n", currentLevel, start)
+	if currentLevel == 9 {
+		fmt.Printf("Hit peak at %v, exiting\n", start)
+		return []Coordinate{start}
+	}
+	nextValidCoords := findNextValidCoords(area, currentLevel, start)
+	if len(nextValidCoords) == 0 {
+		// fmt.Printf("Dead end at %v (%d), exiting\n", start, currentLevel)
+		return []Coordinate{}
+	}
+	ends := []Coordinate{}
+	for _, coord := range nextValidCoords {
+		ends = append(ends, traverseFromCoord(area, coord)...)
+	}
+	return ends
+}
+
+func main() {
+	inputLines := util.FileContentToNonEmptyLines(util.LoadFileFromArgs())
+	area := parseLinesToMap(inputLines)
+	startingPositions := findStartingPositions(area)
+	// log.Printf("Starting positions: %v\n", startingPositions)
+
+	// var wg sync.WaitGroup
+	allCollectedEnds := []Coordinate{}
+	allCollectedPaths := []Coordinate{}
+	// addChan := make(chan []Coordinate, 1)
+	// go func() {
+	// 	for coord := range addChan {
+	// 		allCollectedEnds = append(allCollectedEnds, coord...)
+	// 	}
+	// }()
+	// wg.Add(len(startingPositions))
+	for _, coord := range startingPositions {
+		// go func() {
+		tmp := traverseFromCoord(area, coord)
+		allCollectedEnds = append(
+			allCollectedEnds,
+			sliceutils.RemoveDuplicate(tmp)...)
+		allCollectedPaths = append(allCollectedPaths, tmp...)
+		// wg.Done()
+		// }()
+	}
+	// wg.Wait()
+	// uniqueEnds := sliceutils.RemoveDuplicate(allCollectedEnds)
+	fmt.Printf("Task 1: %d\n", len(allCollectedEnds))
+	fmt.Printf("Task 2: %d\n", len(allCollectedPaths))
+}