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Day16.java
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Day16.java
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package io.github.sirnikolai.days;
import io.github.sirnikolai.AbstractSolution;
import java.util.*;
import java.util.stream.Collectors;
public class Day16 extends AbstractSolution {
@Override
public void Part1(String input) {
Set<Integer> set = new HashSet<>();
String[] in = input.split("\n\n");
parseHeader(in[0], set);
String[] near = in[2].split("\n");
long tally = 0;
for(int i = 1; i < near.length; i++) {
String[] split = near[i].split(",");
for(String s : split) {
int next = Integer.parseInt(s);
if(!set.contains(next)) {
tally += next;
}
}
}
System.out.println(tally);
}
private void parseHeader(String header, Set<Integer> set) {
String[] split = header.split("\n");
for(String s : split) {
String nums = s.substring(s.indexOf(": ") + 2);
String[] ranges = nums.split(" or ");
for(String s2 : ranges) {
String[] split2 = s2.split("-");
for(int i = Integer.parseInt(split2[0]); i <= Integer.parseInt(split2[1]); i++) {
set.add(i);
}
}
}
}
private void parseHeader2(String header, Map<String, Set<Integer>> map) {
String[] split = header.split("\n");
for(String s : split) {
String title = s.substring(0, s.indexOf(":"));
String nums = s.substring(s.indexOf(": ") + 2);
String[] ranges = nums.split(" or ");
Set<Integer> set = new HashSet<>();
map.putIfAbsent(title, set);
for(String s2 : ranges) {
String[] split2 = s2.split("-");
for(int i = Integer.parseInt(split2[0]); i <= Integer.parseInt(split2[1]); i++) {
set.add(i);
}
}
}
}
@Override
public void Part2(String input) {
Map<String, Set<Integer>> map = new HashMap<>();
Set<Integer> predicate = new HashSet<>();
String[] in = input.split("\n\n");
parseHeader2(in[0], map);
parseHeader(in[0], predicate);
String[] near = in[2].split("\n");
String[] myNums = in[1].split("\n");
List<Integer> myList = Arrays.stream(myNums[1].split(",")).map(s -> Integer.parseInt(s)).collect(Collectors.toList());
Map<Integer, Set<String>> mapped = new HashMap<>();
List<List<Integer>> lst = new ArrayList<>();
for(int i = 0; i < myList.size(); i++) {
mapped.putIfAbsent(myList.get(i), new HashSet<>());
lst.add(new ArrayList<>());
lst.get(i).add(myList.get(i));
}
for(int i = 1; i < near.length; i++) {
String[] split = near[i].split(",");
boolean isValid = true;
for(String s : split) {
int next = Integer.parseInt(s);
if(!predicate.contains(next)) {
isValid = false;
break;
}
}
if(isValid) {
for(int j = 0; j < split.length; j++) {
int next = Integer.parseInt(split[j]);
lst.get(j).add(next);
}
}
}
for(Map.Entry<String, Set<Integer>> e : map.entrySet()) {
for(List<Integer> lst2 : lst) {
if(e.getValue().containsAll(lst2)) {
mapped.get(lst2.get(0)).add(e.getKey());
}
}
}
long total = 1;
while(true) {
boolean changed = false;
for(Map.Entry<Integer, Set<String>> e : mapped.entrySet()) {
if(e.getValue().size() == 1) {
changed = true;
String val = (String) e.getValue().toArray()[0];
if(val.startsWith("departure")) {
total *= e.getKey();
}
e.getValue().clear();
for(Set<String> set : mapped.values()) {
set.remove(val);
}
}
}
if(!changed) {
break;
}
}
System.out.println(total);
}
}