AOC 2025 day 7

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 (12/24)
+# 2025 (14/24)
 
 |        # | Name                                            | Solution                             | Test                              |
 |---------:|-------------------------------------------------|:------------------------------------:|:---------------------------------:|
@@ -1674,8 +1674,8 @@
 | 20250502 | [Day 5: Cafeteria  - Part 2][20250502]          | ✅[💾][20250502solution] | ✅[💾][20250502tests] |
 | 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]        |
+| 20250701 | [Day 7: Laboratories ][20250701]                | ✅[💾][20250701solution] | ✅[💾][20250701tests] |
+| 20250702 | [Day 7: Laboratories  - Part 2][20250702]       | ✅[💾][20250702solution] | ✅[💾][20250702tests] |
 | 20250801 | [Day 8: ][20250801]                             | [💾][20250801solution]        | [💾][20250801tests]        |
 | 20250802 | [Day 8:  - Part 2][20250802]                    | [💾][20250802solution]        | [💾][20250802tests]        |
 | 20250901 | [Day 9: ][20250901]                             | [💾][20250901solution]        | [💾][20250901tests]        |

adventofcode/src/main/java/org/ck/adventofcode/year2025/Day07.java

@@ -1,34 +1,69 @@
 package org.ck.adventofcode.year2025;
 
 import java.util.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.ToLongBiFunction;
 import org.ck.adventofcode.util.AOCSolution;
 import org.ck.codechallengelib.annotation.Solution;
 
 @Solution(
     id = 20250701,
-    name = "Day 7: ",
+    name = "Day 7: Laboratories ",
     url = "https://adventofcode.com/2025/day/7",
-    category = "2025",
-    solved = false)
+    category = "2025")
 @Solution(
     id = 20250702,
-    name = "Day 7:  - Part 2",
+    name = "Day 7: Laboratories  - Part 2",
     url = "https://adventofcode.com/2025/day/7#part2",
-    category = "2025",
-    solved = false)
+    category = "2025")
 public class Day07 extends AOCSolution {
 
   @Override
   protected void runPartOne(final Scanner in) {
-    run(in);
+    run(in, (count, _) -> count.get());
   }
 
   @Override
   protected void runPartTwo(final Scanner in) {
-    run(in);
+    run(in, (_, paths) -> Arrays.stream(paths).sum());
   }
 
-  private void run(final Scanner in) {
-    // not yet implemented
+  private void run(final Scanner in, final ToLongBiFunction<AtomicInteger, long[]> resultGetter) {
+    final List<String> lines = new ArrayList<>();
+    long[] paths = null;
+
+    while (in.hasNextLine()) {
+      final String line = in.nextLine();
+
+      final int start = line.indexOf('S');
+      if (start > 0) {
+        paths = new long[line.length()];
+        paths[start] = 1;
+      }
+
+      lines.add(line);
+    }
+
+    if (paths == null) {
+      throw new RuntimeException("No strat found");
+    }
+
+    final AtomicInteger splits = new AtomicInteger(0);
+    for (String line : lines) {
+      for (int column = 0; column < line.length(); ++column) {
+        if (line.charAt(column) == '^') {
+          if (paths[column] > 0) {
+            paths[column - 1] += paths[column];
+            paths[column + 1] += paths[column];
+
+            paths[column] = 0;
+
+            splits.incrementAndGet();
+          }
+        }
+      }
+    }
+
+    print(resultGetter.applyAsLong(splits, paths));
   }
 }

adventofcode/src/test/java/org/ck/adventofcode/year2025/Day07Test.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 Day07Test extends BaseAOCTest {
   @ParameterizedTest
   @ValueSource(strings = {"01a"})

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day07/01.result.txt

@@ -0,0 +1 @@
+1507

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day07/01.txt

@@ -0,0 +1 @@
+21

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day07/01a.result.txt

@@ -0,0 +1,16 @@
+.......S.......
+...............
+.......^.......
+...............
+......^.^......
+...............
+.....^.^.^.....
+...............
+....^.^...^....
+...............
+...^.^...^.^...
+...............
+..^...^.....^..
+...............
+.^.^.^.^.^...^.
+...............

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day07/01a.txt

@@ -0,0 +1 @@
+1537373473728

adventofcode/src/test/resources/org/ck/adventofcode/year2025/day07/02.result.txt

@@ -0,0 +1 @@
+40