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Day09.java
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Day09.java
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// this code consists of 2 classes used in both parts, there are comments of the code that needs to be changed bethween the 2 parts
package org.thehuglio;
import java.util.LinkedList;
import java.util.List;
import java.util.Objects;
public class Numbers {
private final List<List<Integer>> lists = new LinkedList<>();
public Numbers(List<Integer> firstlist) {
lists.add(firstlist);
List<Integer> curentlist = firstlist;
boolean check = true;
while (check) {
List<Integer> temp = new LinkedList<>();
for (int i = 1; i < curentlist.size(); i++) {
temp.add(curentlist.get(i) - curentlist.get(i - 1));
}
lists.add(temp);
curentlist = temp;
for (int i = 1; i < curentlist.size(); i++) {
if (!Objects.equals(curentlist.get(i), curentlist.get(i - 1))) {
check = true;
break;
}
check = false;
}
}
}
public int calcsidenumber() {
int safe = 0;
for (int i = lists.size() - 1; i >= 0; i--) {
safe = lists.get(i).get(lists.get(i).size() - 1) + safe; // for the second part change this line to safe = lists.get(i).get(lists.get(0)) - safe;
}
return safe;
}
}
//Main class (same for both parts)
package org.thehuglio;
import java.io.File;
import java.util.*;
public class Main {
private static final List<String> data = new Reader(new File("data.txt")).data;
public static List<Integer> sorted = new LinkedList<>();
public static void main(String[] args) {
int tot = 0;
for (String data : data) {
String[] split = data.split(" ");
List<Integer> mainvalues = new LinkedList<>();
for (int i = 0; i < data.split(" ").length; i++) {
mainvalues.add(Integer.parseInt(split[i]));
}
tot += new Numbers(mainvalues).calcsidenumber();
}
System.out.println(tot);
}
}