Day 8

day8.py

@@ -0,0 +1,54 @@
+from collections import defaultdict
+
+registers = None
+
+comparison = {
+        '==': lambda x, y : registers[x] == y,
+        '!=': lambda x, y : registers[x] != y,
+        '>=': lambda x, y : registers[x] >= y,
+        '<=': lambda x, y : registers[x] <= y,
+        '<':  lambda x, y : registers[x] <  y,
+        '>':  lambda x, y : registers[x] >  y,
+}
+
+def inc(x, y):
+    registers[x] += y
+
+def dec(x, y):
+    registers[x] -= y
+
+operation = {
+        'inc': inc,
+        'dec': dec,
+}
+
+class Instruction:
+    def __init__(self, line):
+        self.reg, self.op, self.delta, _, self.flag, self.comp, self.val = line.split()
+
+    def evaluate(self):
+        if comparison[self.comp](self.flag, int(self.val)):
+            operation[self.op](self.reg, int(self.delta))
+
+
+with open('input/day8') as f:
+    puzzle_input = [Instruction(line) for line in f.read().splitlines()]
+
+def largest(instructions):
+    global registers
+    registers = defaultdict(int)
+    for i in instructions:
+        i.evaluate()
+    return max(registers.values())
+
+def highest(instructions):
+    global registers
+    registers = defaultdict(int)
+    high = float('-inf')
+    for i in instructions:
+        i.evaluate()
+        high = max(high, max(registers.values()))
+    return high
+
+print(largest(puzzle_input))
+print(highest(puzzle_input))