AOC2022/day8/day8.go

package main

import (
	"AOC2022/helper"
	"fmt"
	"os"
)

type Tree struct {
	height      int
	scenicScone int
}

func main() {
	args := os.Args[1:]
	lines := helper.ReadTextFile(args[0])
	forest := make([][]Tree, len(lines))
	for i, line := range lines {
		forest[i] = make([]Tree, len(line))
		for j, tree := range line {
			forest[i][j] = Tree{int(tree - 48), 1}
		}
	}
	part1and2(forest)
}

func part1and2(forest [][]Tree) {
	sum := 0
	highestScenicScore := 0
	width := len(forest[0])
	for i := 1; i < len(forest)-1; i++ {
		for j := 1; j < width-1; j++ {
			if checkVisibleAllDir([2]int{i, j}, &forest) {
				sum++
			}
			scenicScore := getScenicScore([2]int{i, j}, &forest)
			if scenicScore > highestScenicScore {
				highestScenicScore = scenicScore
			}
		}
	}
	fmt.Println(sum + len(forest)*2 + len(forest[0])*2 - 4)
	fmt.Println(highestScenicScore)
}

func checkVisibleAllDir(startlocation [2]int, forest *[][]Tree) bool {
	directions := [][2]int{{0, -1}, {0, +1}, {-1, 0}, {+1, 0}}
	visible := false
	for _, direction := range directions {
		if checkVisibleDir(startlocation, direction, forest) {
			visible = true
		}
	}
	return visible
}

func checkVisibleDir(startlocation, direction [2]int, forest *[][]Tree) bool {
	currentLocation := startlocation
	scenicscore := 0
	for currentLocation[0] > 0 && currentLocation[1] > 0 &&
		currentLocation[0] < len(*forest)-1 && currentLocation[1] < len((*forest)[0])-1 {
		currentLocation[0] += direction[0]
		currentLocation[1] += direction[1]
		scenicscore++
		if getHeight(currentLocation, forest) >= getHeight(startlocation, forest) {
			addScenicScore(startlocation, forest, scenicscore)
			return false
		}
	}
	addScenicScore(startlocation, forest, scenicscore)
	return true
}

func getHeight(location [2]int, forest *[][]Tree) int {
	return (*forest)[location[0]][location[1]].height
}

func getScenicScore(location [2]int, forest *[][]Tree) int {
	return (*forest)[location[0]][location[1]].scenicScone
}

func addScenicScore(location [2]int, forest *[][]Tree, scenicScore int) {
	(*forest)[location[0]][location[1]].scenicScone *= scenicScore
}