Add solution to day2 part 2, refactoring part 1

day2/main.py

@@ -1,17 +1,18 @@
 import itertools
 
 
-def part1(inputs):
-    inputs[1] = 12
-    inputs[2] = 2
+def execute_program(inputs):
+    TERMINATE_OPCODE = 99
+    ADD_OPCODE = 1
+    MULTIPLY_OPCODE = 2
+
     for i, opcode in itertools.islice(enumerate(inputs), 0, None, 4):
         operation = None
-        # Terminate opcode
-        if opcode == 99:
+        if opcode == TERMINATE_OPCODE:
             break
-        elif opcode == 1:
+        elif opcode == ADD_OPCODE:
             operation = lambda a, b: a + b
-        elif opcode == 2:
+        elif opcode == MULTIPLY_OPCODE:
             operation = lambda a, b: a * b
         else:
             raise Exception('Bad opcode: ' + str(opcode))
@@ -24,8 +25,31 @@ def part1(inputs):
     return inputs[0]
 
 
+def part1(inputs):
+    inputs[1] = 12
+    inputs[2] = 2
+
+    return execute_program(inputs)
+
+
+def part2(inputs):
+    DESIRED_OUTPUT = 19690720
+
+    for i in range(100):
+        for j in range(100):
+            inputs[1] = i
+            inputs[2] = j
+            # Execute the program, making sure we clone the inputs array so we don't reuse the list
+            result = execute_program(inputs[:])
+            if result == DESIRED_OUTPUT:
+                return 100 * i + j
+    else:
+        raise Exception('Could not find result')
+
+
 if __name__ == '__main__':
     with open('input.txt') as f:
         inputs = [int(item) for item in f.read().rstrip().split(',')]
 
-    print(part1(inputs))
+    print(part1(inputs[:]))
+    print(part2(inputs[:]))