diff options
| -rw-r--r-- | day10/day10.java | 146 | ||||
| -rw-r--r-- | day10/test3 | 9 | ||||
| -rw-r--r-- | day10/test4 | 9 | ||||
| -rw-r--r-- | day10/test5 | 10 | ||||
| -rw-r--r-- | day10/test6 | 10 |
5 files changed, 183 insertions, 1 deletions
diff --git a/day10/day10.java b/day10/day10.java index c25fffc..90bb74f 100644 --- a/day10/day10.java +++ b/day10/day10.java @@ -127,7 +127,151 @@ public class day10 { } public static String part2(RandomAccessFile input) throws IOException { - return "WIP"; + int srow = -1, scol = -1; + ArrayList<ArrayList<Tile>> grid = new ArrayList<>(); + String line; + + while ((line = input.readLine()) != null) { + ArrayList<Tile> row = new ArrayList<>(); + grid.add(row); + for (char ch: line.toCharArray()) { + switch (ch) { + case '|': + row.add(Tile.Vertical); + break; + case '-': + row.add(Tile.Horizontal); + break; + case 'L': + row.add(Tile.LBend); + break; + case 'J': + row.add(Tile.JBend); + break; + case '7': + row.add(Tile.SBend); + break; + case 'F': + row.add(Tile.FBend); + break; + case '.': + row.add(Tile.Ground); + break; + case 'S': + row.add(Tile.Start); + srow = grid.size() - 1; + scol = row.size() - 1; + } + } + } + + boolean upcon = false, leftcon = false, + downcon = false, rightcon = false; + + if (srow > 0) { + Tile t = grid.get(srow - 1).get(scol); + if (t == Tile.Vertical || t == Tile.SBend || t == Tile.FBend) { + upcon = true; + } + } + + if (scol > 0) { + Tile t = grid.get(srow).get(scol - 1); + if (t == Tile.Horizontal || t == Tile.LBend || t == Tile.FBend) { + leftcon = true; + } + } + + if (srow < (grid.size() - 1)) { + Tile t = grid.get(srow + 1).get(scol); + if (t == Tile.Vertical || t == Tile.LBend || t == Tile.JBend) { + downcon = true; + } + } + + if (scol < (grid.get(0).size() - 1)) { + Tile t = grid.get(srow).get(scol + 1); + if (t == Tile.Horizontal || t == Tile.JBend || t == Tile.SBend) { + rightcon = true; + + } + } + + Follower fa; + if (upcon && rightcon) { + grid.get(srow).set(scol, Tile.LBend); + fa = new Follower(grid, srow, scol, Dir.Up); + } else if (upcon && downcon) { + grid.get(srow).set(scol, Tile.Vertical); + fa = new Follower(grid, srow, scol, Dir.Up); + } else if (upcon && leftcon) { + grid.get(srow).set(scol, Tile.JBend); + fa = new Follower(grid, srow, scol, Dir.Up); + } else if (rightcon && downcon) { + grid.get(srow).set(scol, Tile.FBend); + fa = new Follower(grid, srow, scol, Dir.Right); + } else if (rightcon && leftcon) { + grid.get(srow).set(scol, Tile.Horizontal); + fa = new Follower(grid, srow, scol, Dir.Right); + } else if (downcon && leftcon) { + + grid.get(srow).set(scol, Tile.SBend); + fa = new Follower(grid, srow, scol, Dir.Down); + } else { + System.out.println("ERROR"); + fa = null; + } + + ArrayList<Integer[]> loop = new ArrayList<>(); + loop.add(new Integer[]{srow, scol}); + fa.step(); + while (!(fa.row == srow && fa.col == scol)) { + loop.add(new Integer[]{fa.row, fa.col}); + fa.step(); + } + + for (int r = 0; r < grid.size(); r++) { + for (int c = 0; c < grid.get(0).size(); c++) { + if (!isOnLoop(loop, new Integer[]{r, c})) { + grid.get(r).set(c, Tile.Ground); + } + } + } + + int inloop = 0; + for (int r = 0; r < grid.size(); r++) { + for (int c = 0; c < grid.get(0).size(); c++) { + if (isInsideLoop(grid, r, c)) { + inloop += 1; + } + } + } + + return "WIP";//Integer.toString(inloop); + } + + static boolean isOnLoop(ArrayList<Integer[]> loop, Integer[] coord) { + for (Integer[] lc: loop) { + if (lc[0] == coord[0] && lc[1] == coord[1]) { + return true; + } + } + return false; + } + + static boolean isInsideLoop(ArrayList<ArrayList<Tile>> grid, int row, int col) { + if (!(grid.get(row).get(col) == Tile.Ground)) { + return false; + } + + int crossings = 0; + while (row >= 0) { + if (grid.get(row).get(col) == Tile.Horizontal) { + crossings += 1; + } + row -= 1; + } + return crossings % 2 == 1; } static enum Tile { diff --git a/day10/test3 b/day10/test3 new file mode 100644 index 0000000..bd9cdf5 --- /dev/null +++ b/day10/test3 @@ -0,0 +1,9 @@ +........... +.S-------7. +.|F-----7|. +.||.....||. +.||.....||. +.|L-7.F-J|. +.|..|.|..|. +.L--J.L--J. +........... diff --git a/day10/test4 b/day10/test4 new file mode 100644 index 0000000..d6c0f21 --- /dev/null +++ b/day10/test4 @@ -0,0 +1,9 @@ +.......... +.S------7. +.|F----7|. +.||....||. +.||....||. +.|L-7F-J|. +.|..||..|. +.L--JL--J. +.......... diff --git a/day10/test5 b/day10/test5 new file mode 100644 index 0000000..adaae96 --- /dev/null +++ b/day10/test5 @@ -0,0 +1,10 @@ +.F----7F7F7F7F-7.... +.|F--7||||||||FJ.... +.||.FJ||||||||L7.... +FJL7L7LJLJ||LJ.L-7.. +L--J.L7...LJS7F-7L7. +....F-J..F7FJ|L7L7L7 +....L7.F7||L7|.L7L7| +.....|FJLJ|FJ|F7|.LJ +....FJL-7.||.||||... +....L---J.LJ.LJLJ... diff --git a/day10/test6 b/day10/test6 new file mode 100644 index 0000000..8f950ae --- /dev/null +++ b/day10/test6 @@ -0,0 +1,10 @@ +FF7FSF7F7F7F7F7F---7 +L|LJ||||||||||||F--J +FL-7LJLJ||||||LJL-77 +F--JF--7||LJLJ7F7FJ- +L---JF-JLJ.||-FJLJJ7 +|F|F-JF---7F7-L7L|7| +|FFJF7L7F-JF7|JL---7 +7-L-JL7||F7|L7F-7F7| +L.L7LFJ|||||FJL7||LJ +L7JLJL-JLJLJL--JLJ.L |