2025(05): part 1 is freshly done

2025/05/README.md

@@ -43,3 +43,21 @@ The Elves are trying to determine which of the _available ingredient IDs_ are _f
 So, in this example, _`3`_ of the available ingredient IDs are fresh.
 
 Process the database file from the new inventory management system. _How many of the available ingredient IDs are fresh?_
+
+### Part Two
+
+The Elves start bringing their spoiled inventory to the trash chute at the back of the kitchen.
+
+So that they can stop bugging you when they get new inventory, the Elves would like to know _all_ of the IDs that the _fresh ingredient ID ranges_ consider to be _fresh_. An ingredient ID is still considered fresh if it is in any range.
+
+Now, the second section of the database (the available ingredient IDs) is irrelevant. Here are the fresh ingredient ID ranges from the above example:
+
+    3-5
+    10-14
+    16-20
+    12-18
+    
+
+The ingredient IDs that these ranges consider to be fresh are `3`, `4`, `5`, `10`, `11`, `12`, `13`, `14`, `15`, `16`, `17`, `18`, `19`, and `20`. So, in this example, the fresh ingredient ID ranges consider a total of _`14`_ ingredient IDs to be fresh.
+
+Process the database file again. _How many ingredient IDs are considered to be fresh according to the fresh ingredient ID ranges?_

2025/05/part1.py

@@ -0,0 +1,33 @@
+import numpy as np
+
+def read_inventory(filename: str):
+	# Read file as list of strings
+	with open(filename, "r") as fp:
+		data = fp.read().splitlines()
+
+    # Split on the empty line to separate ranges and items
+	splitpoint = data.index("")
+	ranges, items = data[:splitpoint], data[splitpoint + 1:]
+
+	return np.array([ran.split("-") for ran in ranges], dtype=int), np.array(items, dtype=int)
+
+def is_fresh(ranges, item):
+	mins = ranges[:,0]
+	maxs = ranges[:,1]
+	return np.any((mins <= item)*(item <= maxs))
+
+def count_fresh_items(ranges, items):
+	return sum([is_fresh(ranges, item) for item in items])
+
+if __name__ == "__main__":
+	test_ranges, test_items = read_inventory("testinput")
+	# for item in test_items:
+	# 	print(is_fresh(item, test_ranges))
+	assert count_fresh_items(test_ranges, test_items) == 3
+
+	test_freshes = [False, True, False, True, True, False]
+	for idx, item in enumerate(test_items):
+		assert is_fresh(test_ranges, item) == test_freshes[idx]
+
+	ranges, items = read_inventory("input")
+	print(count_fresh_items(ranges, items))