aoc 2024 day 3

adventofcode/README.md

@@ -1422,16 +1422,16 @@
 [20232402tests]: src/test/java/org/ck/adventofcode/year2023/Day24Test.java
 [20232501tests]: src/test/java/org/ck/adventofcode/year2023/Day25Test.java
 
-# 2024 (4/49)
+# 2024 (6/49)
 
 |        # | Name                                           | Solution                             | Test                              |
 |---------:|------------------------------------------------|:------------------------------------:|:---------------------------------:|
 | 20240101 | [Day 1: Historian Hysteria][20240101]          | ✅[💾][20240101solution] | ✅[💾][20240101tests] |
 | 20240102 | [Day 1: Historian Hysteria - Part 2][20240102] | ✅[💾][20240102solution] | ✅[💾][20240102tests] |
 | 20240201 | [Day 2: Red-Nosed Reports][20240201]           | ✅[💾][20240201solution] | ✅[💾][20240201tests] |
 | 20240202 | [Day 2: Red-Nosed Reports - Part 2][20240202]  | ✅[💾][20240202solution] | ✅[💾][20240202tests] |
-| 20240301 | [Day 3: ?][20240301]                           | [💾][20240301solution]        | [💾][20240301tests]        |
-| 20240302 | [Day 3: ? - Part 2][20240302]                  | [💾][20240302solution]        | [💾][20240302tests]        |
+| 20240301 | [Day 3: Mull It Over][20240301]                | ✅[💾][20240301solution] | ✅[💾][20240301tests] |
+| 20240302 | [Day 3: Mull It Over - Part 2][20240302]       | ✅[💾][20240302solution] | ✅[💾][20240302tests] |
 | 20240401 | [Day 4: ?][20240401]                           | [💾][20240401solution]        | [💾][20240401tests]        |
 | 20240402 | [Day 4: ? - Part 2][20240402]                  | [💾][20240402solution]        | [💾][20240402tests]        |
 | 20240501 | [Day 5: ?][20240501]                           | [💾][20240501solution]        | [💾][20240501tests]        |

adventofcode/src/main/java/org/ck/adventofcode/year2024/Day03.java

@@ -1,34 +1,76 @@
 package org.ck.adventofcode.year2024;
 
 import java.util.Scanner;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 import org.ck.adventofcode.util.AOCSolution;
 import org.ck.codechallengelib.annotation.Solution;
 
 @Solution(
     id = 20240301,
-    name = "Day 3: ?",
+    name = "Day 3: Mull It Over",
     url = "https://adventofcode.com/2024/day/3",
-    category = "2024",
-    solved = false)
+    category = "2024")
 @Solution(
     id = 20240302,
-    name = "Day 3: ? - Part 2",
+    name = "Day 3: Mull It Over - Part 2",
     url = "https://adventofcode.com/2024/day/3#part2",
-    category = "2024",
-    solved = false)
+    category = "2024")
 public class Day03 extends AOCSolution {
+  private static final Pattern PATTERN =
+      Pattern.compile("mul\\((?<one>\\d{1,3}),(?<two>\\d{1,3})\\)");
+  private static final Pattern DEACTIVATION_PATTERN = Pattern.compile("don't\\(\\)");
+  private static final Pattern ACTIVATION_PATTERN = Pattern.compile("do\\(\\)");
 
   @Override
   protected void runPartOne(final Scanner in) {
-    run(in);
+    run(in, false);
   }
 
   @Override
   protected void runPartTwo(final Scanner in) {
-    run(in);
+    run(in, true);
   }
 
-  private void run(final Scanner in) {
-    print("Whoopsie");
+  private void run(final Scanner in, final boolean enableDisable) {
+    final String input = readInput(in);
+
+    int index = 0;
+    final Matcher matcher = PATTERN.matcher(input);
+    final Matcher deactivationMatcher = DEACTIVATION_PATTERN.matcher(input);
+    final Matcher activeMatcher = ACTIVATION_PATTERN.matcher(input);
+
+    long sum = 0;
+    while (matcher.find(index)) {
+      if (enableDisable && deactivationMatcher.find(index)) {
+        if (deactivationMatcher.start() < matcher.start()) {
+          if (activeMatcher.find(deactivationMatcher.start())) {
+            index = activeMatcher.end();
+            continue;
+          }
+
+          break;
+        }
+      }
+
+      final long one = Long.parseLong(matcher.group("one"));
+      final long two = Long.parseLong(matcher.group("two"));
+      sum += one * two;
+
+      index = matcher.end();
+    }
+
+    print(sum);
+  }
+
+  private static String readInput(final Scanner in) {
+    final StringBuilder builder = new StringBuilder();
+
+    while (in.hasNextLine()) {
+      builder.append(in.nextLine());
+    }
+
+    final String input = builder.toString();
+    return input;
   }
 }

adventofcode/src/test/java/org/ck/adventofcode/year2024/Day03Test.java

@@ -1,11 +1,9 @@
 package org.ck.adventofcode.year2024;
 
 import org.ck.adventofcode.util.BaseAOCTest;
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 
-@Disabled
 class Day03Test extends BaseAOCTest {
   @ParameterizedTest
   @ValueSource(strings = {"01", "01a"})

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/01.result.txt

@@ -0,0 +1 @@
+170778545

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/01a.result.txt

@@ -0,0 +1 @@
+161

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/01a.txt

@@ -0,0 +1 @@
+xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/02.result.txt

@@ -0,0 +1 @@
+82868252

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/02a.result.txt

@@ -0,0 +1 @@
+48

adventofcode/src/test/resources/org/ck/adventofcode/year2024/day03/02a.txt

@@ -0,0 +1 @@
+xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))