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Day07.java
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Day07.java
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//package org.mrbadaxe.AdventOfCode2022;
import java.util.LinkedList;
import java.util.List;
public class Day07{
public static Day07Directory buildFileTree(List<String> input){
Day07Directory root = new Day07Directory();
Day07Directory workingDir = root;
for(String str : input){
String[] tokens = str.split("\s");
if(tokens[0].equals("$")){
if(tokens[1].equals("ls")){
}else if(tokens[1].equals("cd")){
if(tokens[2].equals("..")){
workingDir = workingDir.getParent();
}else if(tokens[2].equals("/")){
workingDir = root;
}else{
workingDir = workingDir.getDir(tokens[2]);
}
}
}else if(tokens[0].equals("dir")){
workingDir.mkDir(tokens[1]);
}else{
workingDir.addFile(tokens[1],Integer.parseInt(tokens[0]));
}
}
return root;
}
public static int getPart01(List<String> input){
Day07Directory root = buildFileTree(input);
int allTheSmallDirs = 0;
LinkedList<Day07Directory> queue = new LinkedList<Day07Directory>();
queue.add(root);
while(queue.size() > 0){
Day07Directory nextDir = queue.removeFirst();
if(nextDir.getDirSize() < 100000){
allTheSmallDirs += nextDir.getDirSize();
}
for(String dir : nextDir.getDirList().keySet()){
queue.add(nextDir.getDir(dir));
}
}
return allTheSmallDirs;
}
public static int getPart02(List<String> input){
Day07Directory root = buildFileTree(input);
int diskSize = 70_000_000;
int freeSpaceRequired = 30_000_000;
int usedSpace = root.getDirSize();
int minimumDeleteSize = freeSpaceRequired - (diskSize - usedSpace);
int smallestDirSize = usedSpace;
LinkedList<Day07Directory> queue = new LinkedList<Day07Directory>();
queue.add(root);
while(queue.size() > 0){
Day07Directory nextDir = queue.removeFirst();
if(nextDir.getDirSize() > minimumDeleteSize){
smallestDirSize = Math.min(smallestDirSize,nextDir.getDirSize());
}
for(String dir : nextDir.getDirList().keySet()){
queue.add(nextDir.getDir(dir));
}
}
return smallestDirSize;
}
}