Day 19 part 2

2019/day19.py

@@ -1,28 +1,53 @@
 from grid import Grid
 from intcode import Intcode
-from tools import parse_intcode
 
 
 def main():
-    codes = parse_intcode("day19.txt")
+    codes = Intcode.parse_file("day19.txt")
+    mgr = DroneMgr(codes)
+
+    # Part 1
     area = Grid()
     for y in range(50):
         for x in range(50):
-            mgr = DroneMgr(codes)
             mgr.run(inputs=[x, y])
-            area.setv(x, y, mgr.output)
+            area.setv(y, x, mgr.clear())
     area.dumb_print()
     num_affected = sum(v for _, _, v in area.values_gen())
     print("Num affected:", num_affected)
 
+    # Part 2
+    d = 100 - 1
+    found = None
+    x, y = 0, 4  # skip beam being too narrow for grid
+    while not found:
+        y += 1
+        while True:
+            mgr.run(inputs=[x, y])
+            if mgr.clear() == 0:
+                x += 1
+                continue
+            mgr.run(inputs=[x + d, y - d])
+            if mgr.clear() == 1:
+                found = (x, y - d)
+            break
+    print("Found 100x100 ship with nearest corner at", found)
+    print("Answer:", found[0] * 10000 + found[1])
+
 
 class DroneMgr(Intcode):
     
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.inputs = [0, 0]
+    def __init__(self, program, *args, **kwargs):
+        super().__init__(program, *args, **kwargs)
+        self.program = program.copy()
         self.output = None
 
+    def clear(self):
+        output = self.output
+        self.reset()
+        self.output = None
+        return output
+
     def output_data(self, data):
         self.output = data
 

2019/intcode.py

@@ -25,6 +25,7 @@ class PMode(IntEnum):
 class Intcode(object):
 
     def __init__(self, program, debug=False):
+        self._program = program.copy()
         self._memory = program.copy()
         self.ip = 0
         self.rel_base = 0
@@ -33,9 +34,20 @@ class Intcode(object):
         self.halt = False
         self.debug = debug
         self._inputs_list = None
+    
+    def reset(self):
+        self._memory = self._program.copy()
+        self.ip = 0
+        self.rel_base = 0
+        self.halt = False
 
     @staticmethod
-    def parse_input(text):
+    def parse_file(filename):
+        with open(filename, "rt") as input_file:
+            return Intcode.parse_text(input_file.read().rstrip())
+
+    @staticmethod
+    def parse_text(text):
         return [int(i) for i in text.rstrip().split(",")]
 
     def log(self, message, *args):

tools.py

@@ -1,6 +0,0 @@
-from intcode import Intcode
-
-
-def parse_intcode(filename):
-    with open(filename, "rt") as input_file:
-        return Intcode.parse_input(input_file.read().rstrip())