From c01254a5cadc7a6947ca4d9489db951ecf7c0fbf Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sat, 10 Dec 2022 10:29:02 +0100
Subject: [PATCH] 2022: d10: ex2: add solution

---
 2022/d10/ex2/ex2.py | 65 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100755 2022/d10/ex2/ex2.py

diff --git a/2022/d10/ex2/ex2.py b/2022/d10/ex2/ex2.py
new file mode 100755
index 0000000..b7bc803
--- /dev/null
+++ b/2022/d10/ex2/ex2.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+import dataclasses
+import sys
+from collections.abc import Iterable, Iterator
+
+
+@dataclasses.dataclass
+class CPU:
+    x: int = dataclasses.field(default=1, init=False)
+    cycle: int = dataclasses.field(default=0, init=False)
+
+    def execute(self, instructions: Iterable[str]) -> Iterator[int]:
+        for instr in instructions:
+            yield from self.execute_once(instr)
+
+    def execute_once(self, instruction: str) -> Iterator[int]:
+        if instruction == "noop":
+            yield from self.__do_cycle()
+        else:
+            assert instruction.startswith("addx")
+            yield from self.__do_cycle(2)
+            self.x += int(instruction.split()[1])
+
+    def __do_cycle(self, cycles: int = 1) -> Iterator[int]:
+        for _ in range(cycles):
+            self.cycle += 1
+            yield self.cycle
+
+
+@dataclasses.dataclass
+class CRT:
+    width: int = dataclasses.field(default=40, init=False)
+    height: int = dataclasses.field(default=6, init=False)
+    pixels: list[list[bool]] = dataclasses.field(init=False)
+
+    def __post_init__(self):
+        self.pixels = [[False for _ in range(self.width)] for _ in range(self.height)]
+
+    def do_pixel(self, cycle: int, x_reg: int) -> None:
+        cycle -= 1  # Simpler modulo computation
+        x, y = cycle % self.width, cycle // self.width % self.height
+        self.pixels[y][x] = abs(x - x_reg) <= 1
+
+    def draw(self) -> str:
+        return "\n".join(
+            "".join("#" if pixel else " " for pixel in line) for line in self.pixels
+        )
+
+
+def solve(input: list[str]) -> str:
+    cpu = CPU()
+    crt = CRT()
+    for cycle in cpu.execute(input):
+        crt.do_pixel(cycle, cpu.x)
+    return crt.draw()
+
+
+def main() -> None:
+    input = sys.stdin.read().splitlines()
+    print(solve(input))
+
+
+if __name__ == "__main__":
+    main()