day24

day24.py

@@ -0,0 +1,68 @@
+import aoclib
+
+DAY = 24
+TEST_SOLUTION_PART1 = 10
+TEST_SOLUTION_PART2 = 2208
+
+
+def getTileGrid(from_input):
+    grid = {}
+    for line in from_input:
+        x = 0
+        y = 0
+        while len(line) > 0:
+            if line[0] == 'e':
+                x += 1
+                line = line[1:]
+            elif line[0] == 'w':
+                x -= 1
+                line = line[1:]
+            elif line[0] == 'n':
+                y -= 1
+                if line[1] == 'e':
+                    x += 1
+                line = line[2:]
+            elif line[0] == 's':
+                y += 1
+                if line[1] == 'w':
+                    x -= 1
+                line = line[2:]
+
+        if (x, y) in grid:
+            del grid[(x, y)]
+        else:
+            grid[(x, y)] = True
+
+    return grid
+
+
+def part1(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+
+    grid = getTileGrid(my_input)
+
+    return len(grid)
+
+
+def part2(test_mode=False):
+    my_input = aoclib.getInputAsArray(day=DAY, test=test_mode)
+    grid = getTileGrid(my_input)
+
+    for i in range(100):
+        black_neighbour_count = {}
+        for coord in grid:
+            x, y = coord
+            for nCoord in [(x-1, y), (x-1, y+1), (x, y-1), (x, y+1), (x+1, y-1), (x+1, y)]:
+                black_neighbour_count[nCoord] = black_neighbour_count.get(nCoord, 0) + 1
+
+        for nCoord, nCount in black_neighbour_count.items():
+            if nCoord in grid and nCount > 2:
+                del grid[nCoord]
+            elif nCoord not in grid and nCount == 2:
+                grid[nCoord] = True
+
+        for coord in grid.copy():
+            if coord not in black_neighbour_count:
+                del grid[coord]
+
+    return len(grid)

inputs/24

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inputs/24_test

@@ -0,0 +1,20 @@
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