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advent-of-code-2024
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Day 7 part 2

main
kirbylife 2024-12-14 00:49:27 -06:00
parent 886e57882e
commit 7a99f86e01
1 changed files with 32 additions and 3 deletions
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35
day-7/Main.java
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@ -18,12 +18,11 @@ public class Main {
this.values = v; this.values = v;
} }
boolean testIt() { boolean part1() {
int possibleCombinations = (int) Math.pow(2, this.values.size()); int possibleCombinations = (int) Math.pow(2, this.values.size());
for (int i = 0; i < possibleCombinations; i++) { for (int i = 0; i < possibleCombinations; i++) {
long newResult = this.values.get(0); long newResult = this.values.get(0);
String out = "" + newResult;
for (int j = 1; j < this.values.size(); j++) { for (int j = 1; j < this.values.size(); j++) {
if ((i >> j) % 2 == 0) { if ((i >> j) % 2 == 0) {
newResult += this.values.get(j); newResult += this.values.get(j);
@ -37,6 +36,29 @@ public class Main {
} }
return false; return false;
} }
boolean part2() {
int possibleCombinations = (int) Math.pow(3, this.values.size());
for (int i = 0; i < possibleCombinations; i++) {
long newResult = this.values.get(0);
for (int j = 1; j < this.values.size(); j++) {
long value = this.values.get(j);
long trin = ((long) (i / Math.pow(3, j)) % 3);
if (trin == 0) {
newResult += value;
} else if (trin == 1) {
newResult *= value;
} else {
newResult = Long.valueOf("" + newResult + value);
}
}
if (newResult == this.result) {
return true;
}
}
return false;
}
} }
static ArrayList<Test> parseInput() { static ArrayList<Test> parseInput() {
@ -63,8 +85,15 @@ public class Main {
public static void main(String args[]) { public static void main(String args[]) {
ArrayList<Test> tests = parseInput(); ArrayList<Test> tests = parseInput();
tests.removeIf(t -> !t.testIt()); tests.removeIf(t -> !t.part1());
long total = tests.stream().mapToLong(t -> t.result).sum(); long total = tests.stream().mapToLong(t -> t.result).sum();
System.out.println("Part 1");
System.out.println(total);
tests = parseInput();
tests.removeIf(t -> !t.part2());
total = tests.stream().mapToLong(t -> t.result).sum();
System.out.println("Part 2");
System.out.println(total); System.out.println(total);
} }
} }