Add min_max to aocpy

Signed-off-by: AKP <tom@tdpain.net>

lib/aocpy/__init__.py

@@ -1,5 +1,5 @@
 from __future__ import annotations
-from typing import Any, TypeVar, Callable, Iterable
+from typing import *
 from collections.abc import Sequence
 
 
@@ -32,6 +32,21 @@ def foldr(p: Callable[[U, T], U], i: Iterable[T], start: U) -> U:
     return foldl(p, reversed(i), start)
 
 
+def min_max(x: Iterable[int]) -> Tuple[int, int]:
+    mini, maxi = None, 0
+
+    for item in x:
+        if item > maxi:
+            maxi = item
+        if mini is None or item < mini:
+            mini = item
+
+    if mini is None:
+        raise ValueError("empty set")
+
+    return mini, maxi
+
+
 class Vector:
     x: int
     y: int