feat: add adv_2024_22

solutions/adv_2024_22.py

@@ -0,0 +1,70 @@
+import math
+import functools
+
+
+def _parse_input(in_str: str) -> list[int]:
+    return [int(_) for _ in in_str.splitlines()]
+
+
+def _mix(val: int, secret: int) -> int:
+    return val ^ secret
+
+
+def _prune(val: int) -> int:
+    return val % 16777216
+
+
+def next_secret(secret: int) -> int:
+    res = secret * 64
+    secret = _prune(_mix(res, secret))
+    res = math.floor(secret / 32)
+    secret = _prune(_mix(res, secret))
+    res = secret * 2048
+    return _prune(_mix(res, secret))
+
+
+@functools.cache
+def _all_secrets(secret: int) -> list[int]:
+    res = [secret]
+    cur_val = secret
+    for _ in range(2000):
+        cur_val = next_secret(cur_val)
+        res.append(cur_val)
+    return res
+
+
+def solve_a(in_str: str) -> int:
+    return sum(
+        _all_secrets(
+            _,
+        )[-1]
+        for _ in _parse_input(in_str)
+    )
+
+
+def _prices(secret: int) -> list[int]:
+    return [_ % 10 for _ in _all_secrets(secret)]
+
+
+def _changes(prices: list[int]) -> list[int]:
+    return [_n - _p for _n, _p in zip(prices[1:], prices)]
+
+
+def _possible_prices(
+    prices: list[int], changes: list[int]
+) -> dict[tuple[int, int, int, int], int]:
+    res = {}
+    for _ in range(len(changes) - 3):
+        pattern = (changes[_], changes[_ + 1], changes[_ + 2], changes[_ + 3])
+        if pattern not in res:
+            res[pattern] = prices[_ + 4]
+    return res
+
+
+def solve_b(in_str: str) -> int:
+    results: dict[tuple[int, int, int, int], int] = {}
+    for _ in _parse_input(in_str):
+        prices = _prices(_)
+        for _k, _v in _possible_prices(prices, _changes(prices)).items():
+            results[_k] = results.get(_k, 0) + _v
+    return max(results.values())

tests/test_adv_2024_22.py

@@ -0,0 +1,29 @@
+import pytest
+
+import solutions.adv_2024_22 as sol
+from . import test_utils as tu
+
+
+@pytest.mark.parametrize(
+    ("secret", "expected"),
+    [
+        (123, 15887950),
+        (15887950, 16495136),
+        (16495136, 527345),
+        (527345, 704524),
+        (704524, 1553684),
+        (1553684, 12683156),
+        (12683156, 11100544),
+        (11100544, 12249484),
+        (12249484, 7753432),
+        (7753432, 5908254),
+    ],
+)
+def test_next_secret(secret: int, expected: int) -> None:
+    assert sol.next_secret(secret) == expected
+
+
+_INPUTS = tu.get_inputs(22, {"small", "p"})
+
+test_solve_a = _INPUTS.get_test(sol.solve_a, {"small": 37327623, "p": 17005483322})
+test_solve_b = _INPUTS.get_test(sol.solve_b, {"p": 1910})