1 files changed, 23 insertions, 0 deletions
diff --git a/utilities.py b/utilities.py
new file mode 100644
index 0000000..1ad24b8
--- /dev/null
+++ b/utilities.py
@@ -0,0 +1,23 @@
+from typing import Tuple
+from random import shuffle
+
+
+def _shuffle_two_lists(a: list, b: list) -> Tuple[list, list]:
+    indices = list(range(len(a)))
+    shuffle(indices)
+    a = [a[index] for index in indices]
+    b = [b[index] for index in indices]
+    return a, b
+
+
+def _pick_from_list_after_sorting_other(a: list, b: list[int]) -> list:
+    indices = [i[0] for i in sorted(enumerate(b), key=lambda x: x[1])]
+    return [a[index] for index in indices]
+
+
+def sample_list(indices: list, cost: list[int], count: int = None) -> list:
+    if count is None:
+        count = len(indices)
+    indices, cost = _shuffle_two_lists(indices, cost)
+    indices = _pick_from_list_after_sorting_other(indices, cost)[:count]
+    return indices