diff options
| author | Nat Lasseter <user@4574.co.uk> | 2023-12-15 15:34:57 +0000 |
|---|---|---|
| committer | Nat Lasseter <user@4574.co.uk> | 2023-12-15 15:34:57 +0000 |
| commit | 7c6defda1df1fd655e06f819c64a7e8279b30207 (patch) | |
| tree | e4038ab591f0c8c7929574118165e57a26fc1ef9 /day13 | |
| parent | 1c879b6b8645a5b22c670f15f989dcbcd479546f (diff) | |
Day 13
Diffstat (limited to 'day13')
| -rw-r--r-- | day13/day13.java | 189 | ||||
| -rw-r--r-- | day13/input | 1365 | ||||
| -rw-r--r-- | day13/test | 15 |
3 files changed, 1569 insertions, 0 deletions
diff --git a/day13/day13.java b/day13/day13.java new file mode 100644 index 0000000..04f1b5f --- /dev/null +++ b/day13/day13.java @@ -0,0 +1,189 @@ +import java.io.IOException; +import java.io.RandomAccessFile; +import java.util.ArrayList; + +public class day13 { + public static void main(String args[]) throws IOException { + RandomAccessFile input = new RandomAccessFile("input", "r"); + System.out.println("Day 13 Part 1: " + part1(input)); + input.seek(0); + System.out.println("Day 13 Part 2: " + part2(input)); + input.close(); + } + + public static String part1(RandomAccessFile input) throws IOException { + ArrayList<Pattern> patterns = new ArrayList<>(); + Pattern pattern; + while ((pattern = getPattern(input)) != null) { + patterns.add(pattern); + } + + int sum = 0; + for (Pattern p: patterns) { + sum += p.mirrorLine(); + } + return Integer.toString(sum); + } + + public static String part2(RandomAccessFile input) throws IOException { + ArrayList<Pattern> patterns = new ArrayList<>(); + Pattern pattern; + while ((pattern = getPattern(input)) != null) { + patterns.add(pattern); + } + + int sum = 0; + for (Pattern p: patterns) { + int line = p.mirrorLine(); +findSmudge: + for (int r = 0; r < p.rows(); r++) { + for (int c = 0; c < p.cols(); c++) { + p.repair(r, c); + int newline = p.differentMirrorLine(line); + p.repair(r, c); + if (newline > 0) { + sum += newline; + break findSmudge; + } + } + } + } + return Integer.toString(sum); + } + + private static Pattern getPattern(RandomAccessFile input) throws IOException { + Pattern pattern = new Pattern(); + + String line = input.readLine(); + while (line != null && line.length() != 0) { + pattern.add(line); + line = input.readLine(); + } + + if (pattern.rows() > 0) { + return pattern; + } else { + return null; + } + } + + private static enum Terrain { + Ash, + Rock + } + + private static class Pattern { + ArrayList<ArrayList<Terrain>> pattern; + + public Pattern() { + this.pattern = new ArrayList<>(); + } + + public void add(String line) { + ArrayList<Terrain> row = new ArrayList<>(); + for (char ch: line.toCharArray()) { + if (ch == '#') { + row.add(Terrain.Rock); + } else if (ch == '.') { + row.add(Terrain.Ash); + } + } + this.pattern.add(row); + } + + public int rows() { + return this.pattern.size(); + } + + public int cols() { + return this.pattern.get(0).size(); + } + + public int mirrorLine() { + for (int i = 1; i < this.cols(); i++) { + boolean isMirrorLine = true; + for (ArrayList<Terrain> row: this.pattern) { + int l = i - 1, r = i; + while (isMirrorLine && l >= 0 && r < this.cols()) { + if (row.get(l) != row.get(r)) { + isMirrorLine = false; + } + l -= 1; + r += 1; + } + } + if (isMirrorLine) { + return i; + } + } + for (int i = 1; i < this.rows(); i++) { + boolean isMirrorLine = true; + int a = i - 1, b = i; + while (isMirrorLine && a >= 0 && b < this.rows()) { + ArrayList<Terrain> ra = this.pattern.get(a); + ArrayList<Terrain> rb = this.pattern.get(b); + for (int j = 0; j < this.cols(); j++) { + if (ra.get(j) != rb.get(j)) { + isMirrorLine = false; + break; + } + } + a -= 1; + b += 1; + } + if (isMirrorLine) { + return 100 * i; + } + } + return 0; + } + + public int differentMirrorLine(int oldLine) { + for (int i = 1; i < this.cols(); i++) { + boolean isMirrorLine = true; + for (ArrayList<Terrain> row: this.pattern) { + int l = i - 1, r = i; + while (isMirrorLine && l >= 0 && r < this.cols()) { + if (row.get(l) != row.get(r)) { + isMirrorLine = false; + } + l -= 1; + r += 1; + } + } + if (isMirrorLine && i != oldLine) { + return i; + } + } + for (int i = 1; i < this.rows(); i++) { + boolean isMirrorLine = true; + int a = i - 1, b = i; + while (isMirrorLine && a >= 0 && b < this.rows()) { + ArrayList<Terrain> ra = this.pattern.get(a); + ArrayList<Terrain> rb = this.pattern.get(b); + for (int j = 0; j < this.cols(); j++) { + if (ra.get(j) != rb.get(j)) { + isMirrorLine = false; + break; + } + } + a -= 1; + b += 1; + } + if (isMirrorLine && (100 * i) != oldLine) { + return 100 * i; + } + } + return 0; + } + + public void repair(int row, int col) { + Terrain smudge = this.pattern.get(row).get(col); + if (smudge == Terrain.Rock) { + this.pattern.get(row).set(col, Terrain.Ash); + } else { + this.pattern.get(row).set(col, Terrain.Rock); + } + } + } +} diff --git a/day13/input b/day13/input new file mode 100644 index 0000000..65dcfd4 --- /dev/null +++ b/day13/input @@ -0,0 +1,1365 @@ +.###....#.###.. +...#.##...#.#.. +.#.#.#.......## +#######..#..#.. +#####.###...#.. +##.##......#.## +###.#.##.#...## +#####.#.###.... +###..##.####... +....#...#....## +...#.######.#.. +.#..#...#.###.. +.###.####..#... +..#####........ +####...#.#..### +####...#.#..### +..###.#........ + +....#.#.. +.######.# +##....... +###.....# +.#.#.#.#. +##.#.#.#. +###.....# +##....... +.######.# +....#.#.. +....#.#.. + +..#...##...#..# +#....####....#. +.##.##..##.##.. +..##.####.##... +###.......####. +.###.#..#.###.# +#.###....###.## +....#....#..... +###........#### 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