AOC2022/day7/day7.go

package main

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

type DirNode struct {
	parent   *DirNode
	size     int // Used to store data
	children map[string]*DirNode
}

func main() {
	args := os.Args[1:]
	lines := helper.ReadTextFile(args[0])
	defer helper.MeasureTime("Main")()
	root := DirNode{nil, 0, map[string]*DirNode{}}
	var currentNode *DirNode
	currentNode = &root
	for i := 1; i < len(lines); i++ {
		line := lines[i]
		if line[:1] != "$" {
			splitLine := strings.Split(line, " ")
			size := 0
			if splitLine[0] != "dir" {
				size = helper.RemoveError(strconv.Atoi(splitLine[0]))
			}
			newNode := DirNode{currentNode, size, map[string]*DirNode{}}
			currentNode.children[splitLine[1]] = &newNode
		} else if line[:4] == "$ ls" {

		} else if line[:6] == "$ cd ." {
			currentNode = currentNode.parent
		} else if line[:4] == "$ cd" {
			currentNode = currentNode.children[line[5:]]
		}
	}
	getSize(&root)
	dirs := getAllDir(&root)
	part1(dirs)
	part2(root.size, dirs)
}

func part2(usedSpace int, dirs []*DirNode) {
	neededSpace := usedSpace - 40000000
	toDeleteDir := &DirNode{nil, 70000000, map[string]*DirNode{}}
	for _, dir := range dirs {
		if dir.size >= neededSpace && dir.size < toDeleteDir.size {
			toDeleteDir = dir
		}
	}
	fmt.Println(toDeleteDir.size)
}

func part1(dirs []*DirNode) {
	sum := 0
	for _, dir := range dirs {
		if dir.size < 100000 {
			sum += dir.size
		}
	}
	fmt.Println(sum)
}

func getAllDir(node *DirNode) []*DirNode {
	dirs := []*DirNode{}
	for _, child := range node.children {
		if len(child.children) > 0 {
			dirs = append(dirs, child)
			dirs = append(dirs, getAllDir(child)...)
		}
	}
	return dirs
}

func getSize(node *DirNode) {
	size := 0
	for _, child := range node.children {
		if child.size == 0 {
			getSize(child)
		}
	}
	for _, child := range node.children {
		size += child.size
	}
	node.size = size
}