start day 11

2018/11.py

@@ -0,0 +1,54 @@
+class Grid:
+    def __init__(self, serial):
+        self.serial = serial
+        
+    def populate(self):
+        self.cells = []
+        for y in range(1, 301):
+            self.cells.append([])
+            for x in range(1, 301):
+                power = self.cell_power(x, y)
+                self.set(x, y, power)
+
+    def get(self, x, y):
+        return self.cells[y - 1][x - 1]
+
+    def set(self, x, y, value):
+        self.cells[y - 1][x - 1] = value
+
+    def cell_power(x, y):
+        rack = x + 10
+        p = (rack * y + self.serial) * rack
+        p = (p // 100) % 10 # keep only hundreds digit
+        return p - 5
+
+
+class Cursor:
+    def __init__(self, parent_grid):
+        self.direction_map = {
+            'up': (0, 1), 
+            'left': (-1, 0), 
+            'right': (1, 0), 
+            'down': (0, -1)
+        }
+        self.grid = parent_grid
+        self.x = self.y = 1
+        self.total_power = sum(self.grid.cell_power(x, y) for y in range(3) for x in range(3))
+
+    def step(self, direction):
+        i, j = self.direction_map(direction)
+        # figure out points to add and subtract via math
+
+    def total_power(self):
+        self.total = 0
+        for y in range(3):
+            for x in range(3):
+                self.total += self.grid.get(x, y)
+
+    def walk(self):
+        max_power = 0
+        while True:
+            if self.total_power > max_power:
+                max_power = self.total_power
+            # step right, down, or left
+