day 2

2019/2/README.md

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+# 2
+
+- Learned about method overloading in python type system.
+- These older ones def. are harder from the start
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>10566835</li>
+    <li>2347</li>
+  </ol>
+</details>

2019/2/python/main.py

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+#!/usr/bin/env python
+
+from os.path import join, dirname
+from typing import overload
+from copy import deepcopy
+
+# Day 2
+
+# Common
+
+
+def read_input(filename):
+    data = join(dirname(__file__), '..', filename)
+    with open(data) as f:
+        return f.read().strip()
+
+
+test = read_input('test.txt')
+data = read_input('input.txt')
+
+# Running
+
+
+class Interpreter:
+    def __init__(self, memory: list[int]) -> None:
+        self.initial = memory
+        self.reset()
+
+    def reset(self):
+        self.counter = 0
+        self.halt = False
+        self.memory = deepcopy(self.initial)
+
+    @overload
+    def pointer(self, offset: int, value:  int) -> None: ...
+    @overload
+    def pointer(self, offset: int, value:  None = None) -> int: ...
+
+    def pointer(self, offset: int, value: int | None = None) -> int | None:
+        p = self.memory[self.counter+offset]
+        if value:
+            self.memory[p] = value
+        return self.memory[p]
+
+    def operation(self):
+        size = 0
+        match self.memory[self.counter]:
+            case 1:
+                left = self.pointer(1)
+                right = self.pointer(2)
+                self.pointer(3, left + right)
+                size = 3
+            case 2:
+                left = self.pointer(1)
+                right = self.pointer(2)
+                self.pointer(3, left * right)
+                size = 3
+            case 99:
+                self.halt = True
+        self.counter += 1 + size
+
+    def run(self):
+        while not self.halt:
+            self.operation()
+
+    def restore(self):
+        self.memory[1] = 12
+        self.memory[2] = 2
+
+    def __str__(self) -> str:
+        return ", ".join(map(str, self.memory))
+
+
+def find(i: Interpreter, target: int):
+    for noun in range(0, 100):
+        for verb in range(0, 100):
+            i.reset()
+            i.memory[1] = noun
+            i.memory[2] = verb
+            i.run()
+            if i.memory[0] == target:
+                return 100 * noun + verb
+
+
+# Part 1
+i = Interpreter(list(map(int, data.split(','))))
+i.restore()
+i.run()
+print(i.memory[0])
+
+# Part 2
+print(find(i, 19690720))