AOC 2025 day 6

Author: TheCK

adventofcode/README.md

@@ -1658,7 +1658,7 @@
 [20242402tests]: src/test/java/org/ck/adventofcode/year2024/Day24Test.java
 [20242501tests]: src/test/java/org/ck/adventofcode/year2024/Day25Test.java
 
-# 2025 (10/24)
+# 2025 (12/24)
 
 |        # | Name                                            | Solution                             | Test                              |
 |---------:|-------------------------------------------------|:------------------------------------:|:---------------------------------:|
@@ -1672,8 +1672,8 @@
 | 20250402 | [Day 4: Printing Department - Part 2][20250402] | ✅[💾][20250402solution] | ✅[💾][20250402tests] |
 | 20250501 | [Day 5: Cafeteria ][20250501]                   | ✅[💾][20250501solution] | ✅[💾][20250501tests] |
 | 20250502 | [Day 5: Cafeteria  - Part 2][20250502]          | ✅[💾][20250502solution] | ✅[💾][20250502tests] |
-| 20250601 | [Day 6: ][20250601]                             | [💾][20250601solution]        | [💾][20250601tests]        |
-| 20250602 | [Day 6:  - Part 2][20250602]                    | [💾][20250602solution]        | [💾][20250602tests]        |
+| 20250601 | [Day 6: Trash Compactor][20250601]              | ✅[💾][20250601solution] | ✅[💾][20250601tests] |
+| 20250602 | [Day 6: Trash Compactor - Part 2][20250602]     | ✅[💾][20250602solution] | ✅[💾][20250602tests] |
 | 20250701 | [Day 7: ][20250701]                             | [💾][20250701solution]        | [💾][20250701tests]        |
 | 20250702 | [Day 7:  - Part 2][20250702]                    | [💾][20250702solution]        | [💾][20250702tests]        |
 | 20250801 | [Day 8: ][20250801]                             | [💾][20250801solution]        | [💾][20250801tests]        |

adventofcode/src/main/java/org/ck/adventofcode/year2025/Day06.java

@@ -1,34 +1,129 @@
 package org.ck.adventofcode.year2025;
 
 import java.util.*;
+import java.util.function.ToLongFunction;
 import org.ck.adventofcode.util.AOCSolution;
 import org.ck.codechallengelib.annotation.Solution;
 
 @Solution(
     id = 20250601,
-    name = "Day 6: ",
+    name = "Day 6: Trash Compactor",
     url = "https://adventofcode.com/2025/day/6",
-    category = "2025",
-    solved = false)
+    category = "2025")
 @Solution(
     id = 20250602,
-    name = "Day 6:  - Part 2",
+    name = "Day 6: Trash Compactor - Part 2",
     url = "https://adventofcode.com/2025/day/6#part2",
-    category = "2025",
-    solved = false)
+    category = "2025")
 public class Day06 extends AOCSolution {
 
   @Override
   protected void runPartOne(final Scanner in) {
-    run(in);
+    run(in, Day06::getPart1Result);
   }
 
   @Override
   protected void runPartTwo(final Scanner in) {
-    run(in);
+    run(in, Day06::getPart2Result);
   }
 
-  private void run(final Scanner in) {
-    // not yet implemented
+  private void run(final Scanner in, final ToLongFunction<List<List<String>>> getResult) {
+    final List<String> inputs = new ArrayList<>();
+
+    while (in.hasNextLine()) {
+      inputs.add(in.nextLine());
+    }
+
+    final String operations = inputs.getLast();
+    final List<List<String>> columns = new ArrayList<>();
+    for (int j = 0; j < inputs.size() - 1; ++j) {
+      columns.add(new ArrayList<>());
+    }
+
+    int start = 1;
+    while (true) {
+      final int nextPlus = operations.indexOf('+', start);
+      final int nextTimes = operations.indexOf('*', start);
+
+      final int nextNumberStart;
+      if (nextPlus == -1 && nextTimes == -1) {
+        break;
+      } else if (nextPlus == -1) {
+        nextNumberStart = nextTimes;
+      } else if (nextTimes == -1) {
+        nextNumberStart = nextPlus;
+      } else {
+        nextNumberStart = Math.min(nextPlus, nextTimes);
+      }
+
+      for (int j = 0; j < inputs.size() - 1; ++j) {
+        columns.get(j).add(inputs.get(j).substring(start - 1, nextNumberStart - 1));
+      }
+
+      start = nextNumberStart + 1;
+    }
+    for (int j = 0; j < inputs.size() - 1; ++j) {
+      columns.get(j).add(inputs.get(j).substring(start - 1));
+    }
+
+    columns.add(new ArrayList<>(Arrays.asList(operations.trim().split("\\s+"))));
+
+    print(getResult.applyAsLong(columns));
+  }
+
+  private static Long getPart1Result(List<List<String>> inputs) {
+    long sum = 0;
+    for (int i = 0; i < inputs.get(0).size(); ++i) {
+      final String operation = inputs.get(inputs.size() - 1).get(i);
+      long result = "*".equals(operation) ? 1 : 0;
+
+      for (int j = 0; j < inputs.size() - 1; ++j) {
+        switch (operation) {
+          case "+" -> result += Long.parseLong(inputs.get(j).get(i).trim());
+          case "*" -> result *= Long.parseLong(inputs.get(j).get(i).trim());
+        }
+      }
+
+      sum += result;
+    }
+
+    return sum;
+  }
+
+  private static Long getPart2Result(List<List<String>> inputs) {
+    long sum = 0;
+    for (int i = 0; i < inputs.get(0).size(); ++i) {
+      int numbersCount = 0;
+      for (int j = 0; j < inputs.size() - 1; ++j) {
+        numbersCount = Math.max(numbersCount, inputs.get(j).get(i).length());
+      }
+
+      final List<Long> numbers = new ArrayList<>();
+      for (int numberIndex = 0; numberIndex < numbersCount; ++numberIndex) {
+        long number = 0;
+        for (int j = 0; j < inputs.size() - 1; ++j) {
+          char current = inputs.get(j).get(i).charAt(numberIndex);
+
+          if (current != ' ') {
+            number = number * 10 + (current - '0');
+          }
+        }
+
+        numbers.add(number);
+      }
+
+      final String operation = inputs.get(inputs.size() - 1).get(i);
+      long result = "*".equals(operation) ? 1 : 0;
+      for (Long number : numbers) {
+        switch (operation) {
+          case "+" -> result += number;
+          case "*" -> result *= number;
+        }
+      }
+
+      sum += result;
+    }
+
+    return sum;
   }
 }

adventofcode/src/test/java/org/ck/adventofcode/year2025/Day06Test.java

@@ -1,11 +1,9 @@
 package org.ck.adventofcode.year2025;
 
 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 Day06Test extends BaseAOCTest {
   @ParameterizedTest
   @ValueSource(strings = {"01a"})

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day06/01.result.txt

@@ -0,0 +1 @@
+6343365546996

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day06/01.txt

@@ -0,0 +1 @@
+4277556

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day06/01a.result.txt

@@ -0,0 +1,4 @@
+123 328  51 64 
+ 45 64  387 23 
+  6 98  215 314
+*   +   *   +  

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day06/01a.txt

@@ -0,0 +1 @@
+11136895955912

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day06/02.result.txt

@@ -0,0 +1 @@
+3263827