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AOC 2025 day 4
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‎adventofcode/README.md‎

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[20242402tests]: src/test/java/org/ck/adventofcode/year2024/Day24Test.java
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[20242501tests]: src/test/java/org/ck/adventofcode/year2024/Day25Test.java
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# 2025 (6/24)
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# 2025 (8/24)
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1663-
| # | Name | Solution | Test |
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|---------:|---------------------------------------------|:------------------------------------:|:---------------------------------:|
1665-
| 20250101 | [Day 1: Secret Entrance][20250101] | ✅[💾][20250101solution] | ✅[💾][20250101tests] |
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| 20250102 | [Day 1: Secret Entrance - Part 2][20250102] | ✅[💾][20250102solution] | ✅[💾][20250102tests] |
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| 20250201 | [Day 2: Gift Shop][20250201] | ✅[💾][20250201solution] | ✅[💾][20250201tests] |
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| 20250202 | [Day 2: Gift Shop - Part 2][20250202] | ✅[💾][20250202solution] | ✅[💾][20250202tests] |
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| 20250301 | [Day 3: Lobby ][20250301] | ✅[💾][20250301solution] | ✅[💾][20250301tests] |
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| 20250302 | [Day 3: Lobby - Part 2][20250302] | ✅[💾][20250302solution] | ✅[💾][20250302tests] |
1671-
| 20250401 | [Day 4: ][20250401] | [💾][20250401solution] | [💾][20250401tests] |
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| 20250402 | [Day 4: - Part 2][20250402] | [💾][20250402solution] | [💾][20250402tests] |
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| 20250501 | [Day 5: ][20250501] | [💾][20250501solution] | [💾][20250501tests] |
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| 20250502 | [Day 5: - Part 2][20250502] | [💾][20250502solution] | [💾][20250502tests] |
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| 20250601 | [Day 6: ][20250601] | [💾][20250601solution] | [💾][20250601tests] |
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| 20250602 | [Day 6: - Part 2][20250602] | [💾][20250602solution] | [💾][20250602tests] |
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| 20250701 | [Day 7: ][20250701] | [💾][20250701solution] | [💾][20250701tests] |
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| 20250702 | [Day 7: - Part 2][20250702] | [💾][20250702solution] | [💾][20250702tests] |
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| 20250801 | [Day 8: ][20250801] | [💾][20250801solution] | [💾][20250801tests] |
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| 20250802 | [Day 8: - Part 2][20250802] | [💾][20250802solution] | [💾][20250802tests] |
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| 20250901 | [Day 9: ][20250901] | [💾][20250901solution] | [💾][20250901tests] |
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| 20250902 | [Day 9: - Part 2][20250902] | [💾][20250902solution] | [💾][20250902tests] |
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| 20251001 | [Day 10: ][20251001] | [💾][20251001solution] | [💾][20251001tests] |
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| 20251002 | [Day 10: - Part 2][20251002] | [💾][20251002solution] | [💾][20251002tests] |
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| 20251101 | [Day 11: ][20251101] | [💾][20251101solution] | [💾][20251101tests] |
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| 20251102 | [Day 11: - Part 2][20251102] | [💾][20251102solution] | [💾][20251102tests] |
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| 20251201 | [Day 12: ][20251201] | [💾][20251201solution] | [💾][20251201tests] |
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| 20251202 | [Day 12: - Part 2][20251202] | [💾][20251202solution] | [💾][20251202tests] |
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| # | Name | Solution | Test |
1664+
|---------:|-------------------------------------------------|:------------------------------------:|:---------------------------------:|
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| 20250101 | [Day 1: Secret Entrance][20250101] | ✅[💾][20250101solution] | ✅[💾][20250101tests] |
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| 20250102 | [Day 1: Secret Entrance - Part 2][20250102] | ✅[💾][20250102solution] | ✅[💾][20250102tests] |
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| 20250201 | [Day 2: Gift Shop][20250201] | ✅[💾][20250201solution] | ✅[💾][20250201tests] |
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| 20250202 | [Day 2: Gift Shop - Part 2][20250202] | ✅[💾][20250202solution] | ✅[💾][20250202tests] |
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| 20250301 | [Day 3: Lobby ][20250301] | ✅[💾][20250301solution] | ✅[💾][20250301tests] |
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| 20250302 | [Day 3: Lobby - Part 2][20250302] | ✅[💾][20250302solution] | ✅[💾][20250302tests] |
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| 20250401 | [Day 4: Printing Department][20250401] | ✅[💾][20250401solution] | ✅[💾][20250401tests] |
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| 20250402 | [Day 4: Printing Department - Part 2][20250402] | ✅[💾][20250402solution] | ✅[💾][20250402tests] |
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| 20250501 | [Day 5: ][20250501] | [💾][20250501solution] | [💾][20250501tests] |
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| 20250502 | [Day 5: - Part 2][20250502] | [💾][20250502solution] | [💾][20250502tests] |
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| 20250601 | [Day 6: ][20250601] | [💾][20250601solution] | [💾][20250601tests] |
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| 20250602 | [Day 6: - Part 2][20250602] | [💾][20250602solution] | [💾][20250602tests] |
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| 20250701 | [Day 7: ][20250701] | [💾][20250701solution] | [💾][20250701tests] |
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| 20250702 | [Day 7: - Part 2][20250702] | [💾][20250702solution] | [💾][20250702tests] |
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| 20250801 | [Day 8: ][20250801] | [💾][20250801solution] | [💾][20250801tests] |
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| 20250802 | [Day 8: - Part 2][20250802] | [💾][20250802solution] | [💾][20250802tests] |
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| 20250901 | [Day 9: ][20250901] | [💾][20250901solution] | [💾][20250901tests] |
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| 20250902 | [Day 9: - Part 2][20250902] | [💾][20250902solution] | [💾][20250902tests] |
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| 20251001 | [Day 10: ][20251001] | [💾][20251001solution] | [💾][20251001tests] |
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| 20251002 | [Day 10: - Part 2][20251002] | [💾][20251002solution] | [💾][20251002tests] |
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| 20251101 | [Day 11: ][20251101] | [💾][20251101solution] | [💾][20251101tests] |
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| 20251102 | [Day 11: - Part 2][20251102] | [💾][20251102solution] | [💾][20251102tests] |
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| 20251201 | [Day 12: ][20251201] | [💾][20251201solution] | [💾][20251201tests] |
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| 20251202 | [Day 12: - Part 2][20251202] | [💾][20251202solution] | [💾][20251202tests] |
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16901690
[20250101]: https://adventofcode.com/2025/day/1
16911691
[20250102]: https://adventofcode.com/2025/day/1#part2

‎adventofcode/src/main/java/org/ck/adventofcode/year2025/Day04.java‎

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@Solution(
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id = 20250401,
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name = "Day 4: ",
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name = "Day 4: Printing Department",
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url = "https://adventofcode.com/2025/day/4",
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category = "2025",
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solved = false)
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category = "2025")
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@Solution(
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id = 20250402,
15-
name = "Day 4: - Part 2",
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name = "Day 4: Printing Department - Part 2",
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url = "https://adventofcode.com/2025/day/4#part2",
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category = "2025",
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solved = false)
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category = "2025")
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public class Day04 extends AOCSolution {
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2119
@Override
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protected void runPartOne(final Scanner in) {
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run(in);
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run(in, false);
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}
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@Override
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protected void runPartTwo(final Scanner in) {
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run(in);
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run(in, true);
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}
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private void run(final Scanner in) {
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// not yet implemented
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private void run(final Scanner in, final boolean loop) {
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final List<String> rows = new ArrayList<>();
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while (in.hasNextLine()) {
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rows.add(in.nextLine());
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}
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char[][] grid = new char[rows.size()][rows.get(0).length()];
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for (int i = 0; i < rows.size(); ++i) {
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for (int j = 0; j < rows.get(i).length(); ++j) {
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grid[i][j] = rows.get(i).charAt(j);
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}
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}
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int movable = 0;
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boolean moved = false;
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do {
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char[][] newGrid = new char[grid.length][grid[0].length];
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moved = false;
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for (int row = 0; row < grid.length; ++row) {
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for (int column = 0; column < grid[row].length; ++column) {
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int surrounding = 0;
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for (int i = Math.max(row - 1, 0); i <= Math.min(row + 1, grid.length - 1); ++i) {
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for (int j = Math.max(column - 1, 0);
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j <= Math.min(column + 1, grid[i].length - 1);
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++j) {
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if (i != row || j != column) {
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surrounding += grid[i][j] == '@' ? 1 : 0;
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}
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}
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}
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if (grid[row][column] == '@' && surrounding < 4) {
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moved = true;
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++movable;
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newGrid[row][column] = '.';
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} else {
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newGrid[row][column] = grid[row][column];
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}
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}
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}
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grid = newGrid;
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} while (loop && moved);
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print(movable);
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}
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}

‎adventofcode/src/test/java/org/ck/adventofcode/year2025/Day04Test.java‎

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package org.ck.adventofcode.year2025;
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import org.ck.adventofcode.util.BaseAOCTest;
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import org.junit.jupiter.api.Disabled;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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@Disabled
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class Day04Test extends BaseAOCTest {
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@ParameterizedTest
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@ValueSource(strings = {"01a"})

‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/01.result.txt‎

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‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/01.txt‎

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‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/01a.result.txt‎

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‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/01a.txt‎

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..@@.@@@@.
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@@@.@.@.@@
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@@@@@.@.@@
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@.@@@@..@.
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@@.@@@@.@@
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.@@@@@@@.@
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.@.@.@.@@@
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@.@@@.@@@@
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.@@@@@@@@.
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@.@.@@@.@.

‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/02.result.txt‎

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‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/02.txt‎

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‎adventofcode/src/test/resources/org/ck/adventofcode/year2025/day04/02a.result.txt‎

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