finish 11 and start 12

2018/09.py

@@ -1,13 +1,13 @@
-from collections import deque
+from collections import deque, Counter
 import re
 
 
 def simulate(num_players, last_marble):
     circle = deque([0])
-    players = [0 for i in range(num_players)]
+    players = Counter()
     current_turn = 1
     while current_turn <= last_marble:
-        current_player = (current_turn % len(players)) - 1
+        current_player = (current_turn % num_players) - 1
         
         if current_turn % 23 == 0:
             players[current_player] += current_turn
@@ -17,7 +17,7 @@ def simulate(num_players, last_marble):
             circle.rotate(-2)
             circle.appendleft(current_turn)
         current_turn += 1
-    return max(players)
+    return players.most_common()[0][1]
 
 
 with open('data/09.txt') as f:

2018/11.py

@@ -26,51 +26,53 @@ class Grid:
 
 
 class Cursor:
-    def __init__(self, parent_grid):
+    def __init__(self, parent_grid, cursor_size):
         self.grid = parent_grid
+        self.size = cursor_size
         self.x = self.y = 1
-        self.calc_power()
+        self.total_power = self.calc_power()
 
     def step(self, direction):
         if direction in ('right', 'left'):
             axis = 'vertical'
-            new_x, new_y = 1, 0
+            delta_x, delta_y = 1, 0
         elif direction in ('up', 'down'):
             axis = 'horizontal'
-            new_x, new_y = 0, 1
+            delta_x, delta_y = 0, 1
 
         if direction in ('right', 'down'):
-            delta_new, delta_old = 3, 0
+            offset_new, offset_old = self.size, 0
         elif direction in ('left', 'up'):
-            delta_new, delta_old = -1, 2
-            new_x, new_y = new_x * -1, new_y * -1
+            offset_new, offset_old = -1, self.size - 1
+            delta_x, delta_y = delta_x * -1, delta_y * -1
 
-        new_points = self.get_row(delta_new, axis)
-        old_points = self.get_row(delta_old, axis)
+        new_points = self.get_row(offset_new, axis)
+        old_points = self.get_row(offset_old, axis)
         self.total_power += sum(new_points)
         self.total_power -= sum(old_points)
-        self.x, self.y = self.x + new_x, self.y + new_y
+        self.x, self.y = self.x + delta_x, self.y + delta_y
 
     def get_row(self, delta, axis):
         points = []
         if axis == 'vertical':
-            for y in range(self.y, self.y + 3):
+            for y in range(self.y, self.y + self.size):
                 points.append(self.grid.get(self.x + delta, y))
         elif axis == 'horizontal':
-            for x in range(self.x, self.x + 3):
+            for x in range(self.x, self.x + self.size):
                 points.append(self.grid.get(x, self.y + delta))
         return points
 
     def jump(self, x, y):
         self.x = x
         self.y = y
-        self.calc_power()
+        self.total_power = self.calc_power()
 
     def calc_power(self):
-        self.total_power = 0
-        for y in range(3):
-            for x in range(3):
-                self.total_power += self.grid.get(self.x + x, self.y + y)
+        total = 0
+        for y in range(self.size):
+            for x in range(self.size):
+                total += self.grid.get(self.x + x, self.y + y)
+        return total
 
     def find_max(self):
         coords, max_power = (0, 0), 0
@@ -78,8 +80,8 @@ class Cursor:
         while True:
             if self.total_power > max_power:
                 coords, max_power = (self.x, self.y), self.total_power
-            
-            if self.x in (1, 298) and prev_dir != 'down': # cursor is at edge of grid
+
+            if self.x in (1, 301 - self.size) and prev_dir != 'down': # cursor is at edge of grid
                 direction = 'down'
             elif self.y % 2 == 0: # go left on even lines
                 direction = 'left'
@@ -96,6 +98,15 @@ class Cursor:
 
 
 grid = Grid(7857)
-cursor = Cursor(grid)
+cursor = Cursor(grid, 3)
 coords, max_power = cursor.find_max()
-print(f'Part 1: {coords[0]}, {coords[1]}, {max_power}')
+print(f'Part 1: {coords[0]},{coords[1]}, ({max_power})\n')
+
+coords = max_power = grid_size = 0
+for s in range(1, 301):
+    cursor = Cursor(grid, s)
+    c, m = cursor.find_max()
+    if m > max_power:
+        coords, max_power, grid_size = c, m, s
+
+print(f'Part 2: {coords[0]},{coords[1]},{grid_size} ({max_power})\n')

2018/12.py

@@ -0,0 +1,52 @@
+def to_int(bitlist):
+    out = 0
+    for bit in bitlist:
+        out = out * 2 + bit
+    return out
+
+
+def get_slice(index, pots):
+    for i in range(index - 2, index + 3):
+        if i < 0:
+            yield 0
+        yield pots[i]
+
+
+def grow(init, num_gens):
+    current_gen = init
+    for g in range(num_gens):
+        while current_gen[:2] != [0, 0]:
+            current_gen.insert(0, 0)
+        while current_gen[-2:] != [0, 0]:
+            current_gen.append(0)
+        
+        next_gen = []
+        for i, b in enumerate(current_gen):
+            key = to_int(get_slice(i, current_gen))
+            if key in positives:
+                next_gen.append(1)
+            else:
+                next_gen.append(0)
+        current_gen = next_gen
+
+    return current_gen
+
+
+with open('data/12.txt') as f:
+    initial = list(next(f)[15:-1])
+    initial = list(map(lambda p: int(p == '#'), initial))
+    next(f)
+    positives, negatives = set(), set()
+    for line in f:
+        state, result = line.strip().split(' => ')
+        s = to_int(int(c == '#') for c in state)
+        if result == '#':
+            positives.add(s)
+        else:
+            negatives.add(s)
+
+
+def test(n):
+    result = grow(initial, n)
+    print(''.join('#' if p else '.' for p in result))
+

2018/data/12.txt

@@ -0,0 +1,34 @@
+initial state: ##.#.####..#####..#.....##....#.#######..#.#...........#......##...##.#...####..##.#..##.....#..####
+
+#..#. => #
+.###. => .
+..##. => .
+....# => .
+#...# => .
+.#.#. => .
+#.#.# => #
+#.... => .
+#.#.. => #
+###.# => .
+.#... => #
+#.### => .
+.#.## => #
+..#.. => #
+.#### => .
+..### => #
+...#. => .
+##.#. => #
+##.## => #
+.##.# => #
+###.. => .
+..#.# => .
+...## => #
+##... => #
+##### => .
+#.##. => .
+.#..# => #
+##..# => .
+..... => .
+####. => #
+#..## => .
+.##.. => #