Day 12 13

2021/12.input

@@ -0,0 +1,25 @@
+qi-UD
+jt-br
+wb-TF
+VO-aa
+UD-aa
+br-end
+end-HA
+qi-br
+br-HA
+UD-start
+TF-qi
+br-hf
+VO-hf
+start-qi
+end-aa
+hf-HA
+hf-UD
+aa-hf
+TF-hf
+VO-start
+wb-aa
+UD-wb
+KX-wb
+qi-VO
+br-TF

2021/12.py

@@ -0,0 +1,17 @@
+from collections import defaultdict
+
+paths = defaultdict(list)
+for a,b in [line.split('-') for line in open("./2021/12.input").read().splitlines()]:
+    paths[a].append(b)
+    paths[b].append(a)
+
+def dfs(cave, visited, one_off):
+    if (cave == "end"): return 1
+    if (cave.islower()): visited.add(cave)
+    total = sum([dfs(i, visited, one_off) for i in paths[cave] if not i in visited])
+    total += sum([dfs(i, visited, i) for i in paths[cave] if i in visited and i != 'start']) if one_off == ' ' else 0
+    if (cave != one_off): visited.discard(cave)
+    return total;
+
+print ('Part 1:', dfs("start", set(), ''))
+print ('Part 2:', dfs("start", set(), ' '))

2021/13.input

@@ -0,0 +1,836 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6

2021/13.py

@@ -0,0 +1,72 @@
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True, eq=True)
+class Point:
+    x: int
+    y: int
+
+
+@dataclass
+class Fold:
+    axis: str
+    val: int
+
+
+def fold_grid(points: list[Point], fold: Fold) -> list[Point]:
+    """Apply fold transformation to points on the grid"""
+    points = points.copy()
+    for i, point in enumerate(points):
+        if fold.axis == "x" and point.x > fold.val:
+            points[i] = Point(x=2 * fold.val - point.x, y=point.y)
+        elif fold.axis == "y" and point.y > fold.val:
+            points[i] = Point(x=point.x, y=2 * fold.val - point.y)
+    return points
+
+
+def find_max_xy(points: list[Point]) -> tuple[int, int]:
+    """Find the maximum values for x and y on the current grid"""
+    return max(point.x for point in points), max(point.y for point in points)
+
+
+def print_grid(points: list[Point]) -> None:
+    """Print the current state of the grid"""
+    # get boundary coordinates for current grid
+    max_x, max_y = find_max_xy(points)
+    print(
+        "\n".join(
+            "".join("#" if Point(x, y) in points else "." for x in range(max_x + 1))
+            for y in range(max_y + 1)
+        )
+    )
+
+
+def part_1(points: list[Point], fold: Fold) -> int:
+    """calc number of visible dots after first fold"""
+    points = fold_grid(points, fold)
+    return len(set(points))
+
+
+def part_2(points: list[Point], folds: list[Fold]) -> None:
+    """print the final code"""
+    for fold in folds:
+        points = fold_grid(points, fold)
+    print_grid(points)
+
+
+if __name__ == "__main__":
+    with open("./2021/13.input", "r") as input:
+        points, folds = input.read().split("\n\n")
+        points = [
+            Point(*tuple(map(int, point.split(",")))) for point in points.splitlines()
+        ]
+        folds = [
+            Fold(*(axis[-1], int(val)))
+            for fold in folds.splitlines()
+            for axis, val in [fold.split("=")]
+        ]
+
+    part_1_ans = part_1(points, folds[0])
+    print(part_1_ans)
+
+    part_2(points, folds)

2021/13.test

@@ -0,0 +1,21 @@
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5