diff options
| author | Nat Lasseter <user@4574.co.uk> | 2023-12-12 00:44:27 +0000 |
|---|---|---|
| committer | Nat Lasseter <user@4574.co.uk> | 2023-12-12 00:44:27 +0000 |
| commit | 0cecba62086661c79900f4a70b5549885ffd2c59 (patch) | |
| tree | 877f11924a8354a4cdf22052be237fcb2d686af2 | |
| parent | 3a48754813c6c79f68d6246799d8c9e511243a37 (diff) | |
Day 11 part 1
| -rw-r--r-- | day11/day11.java | 91 | ||||
| -rw-r--r-- | day11/input | 140 | ||||
| -rw-r--r-- | day11/test | 10 |
3 files changed, 241 insertions, 0 deletions
diff --git a/day11/day11.java b/day11/day11.java new file mode 100644 index 0000000..6bf7c19 --- /dev/null +++ b/day11/day11.java @@ -0,0 +1,91 @@ +import java.io.IOException; +import java.io.RandomAccessFile; +import java.util.ArrayList; + +public class day11 { + public static void main(String args[]) throws IOException { + RandomAccessFile input = new RandomAccessFile("input", "r"); + System.out.println("Day 11 Part 1: " + part1(input)); + input.seek(0); + System.out.println("Day 11 Part 2: " + part2(input)); + input.close(); + } + + public static String part1(RandomAccessFile input) throws IOException { + ArrayList<ArrayList<Pixel>> image = new ArrayList<>(); + + String line; + while ((line = input.readLine()) != null) { + ArrayList<Pixel> linea = new ArrayList<>(); + for (char ch: line.toCharArray()) { + if (ch == '.') { + linea.add(Pixel.Space); + } else if (ch == '#') { + linea.add(Pixel.Galaxy); + } + } + image.add(linea); + } + + for (int i = image.size() - 1; i >= 0; i--) { + if (allSpace(image.get(i))) { + image.add(i+1, (ArrayList<Pixel>) image.get(i).clone()); + } + } + + for (int i = image.get(0).size() - 1; i >= 0; i--) { + ArrayList<Pixel> col = new ArrayList<>(); + + for (ArrayList<Pixel> row: image) { + col.add(row.get(i)); + } + + if (allSpace(col)) { + for (ArrayList<Pixel> row: image) { + row.add(i+1, row.get(i)); + } + } + } + + ArrayList<Integer[]> galaxies = new ArrayList<>(); + for (int r = 0; r < image.size(); r++) { + for (int c = 0; c < image.get(0).size(); c++) { + if (image.get(r).get(c) == Pixel.Galaxy) { + galaxies.add(new Integer[] {r, c}); + } + } + } + + int sum = 0; + + for (int i = 0; i < galaxies.size() - 1; i++) { + for (int j = i + 1; j < galaxies.size(); j++) { + sum += dist(galaxies.get(i), galaxies.get(j)); + } + } + + return Integer.toString(sum); + } + + public static String part2(RandomAccessFile input) throws IOException { + return "WIP"; + } + + static enum Pixel { + Space, + Galaxy + } + + private static boolean allSpace(ArrayList<Pixel> line) { + for (Pixel px: line) { + if (px == Pixel.Galaxy) { + return false; + } + } + return true; + } + + private static int dist(Integer[] i, Integer[] j) { + return Math.abs(i[0] - j[0]) + Math.abs(i[1] - j[1]); + } +} diff --git a/day11/input b/day11/input new file mode 100644 index 0000000..51d65a3 --- /dev/null +++ b/day11/input @@ -0,0 +1,140 @@ +....................#........#...............................#............................................................#................# +............#...................................#........................................#........#..................#...........#.......... +.#.......................#.................................................................................................................. +..........................................................#.................................................#............................... 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