feat: part 2 of day 3 complete

day3/main.py

@@ -1,3 +1,6 @@
+from functools import reduce
+import numpy
+
 rucksacks = []
 
 input_file = open("input.txt", "r")
@@ -15,23 +18,39 @@ for line in lines:
     rucksacks[-1].append(first_compartment)
     rucksacks[-1].append(second_compartment)
 
-
 # part 1
 
 
-def get_item_in_common(first_compartment, second_compartment):
-    item = [value for value in first_compartment if value in second_compartment][0]
-    return item
+def get_items_in_common(items_one, items_two):
+    items = [value for value in items_one if value in items_two]
+    return items
 
 
 letters = list("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 
-total_priority = 0
+total_priority_part_one = 0
 for rucksack in rucksacks:
     first_compartment = rucksack[0]
     second_compartment = rucksack[1]
 
-    in_common = get_item_in_common(first_compartment, second_compartment)
-    total_priority += letters.index(in_common) + 1
+    in_common = get_items_in_common(first_compartment, second_compartment)[0]
+    total_priority_part_one += letters.index(in_common) + 1
 
-print("Part 1: " + str(total_priority))
+print("Part 1: " + str(total_priority_part_one))
+
+# part 2
+
+rucksack_groups = [[y[0]+y[1] for y in rucksacks][x:x+3]
+                   for x in range(0, len(rucksacks), 3)]
+
+total_priority_part_two = 0
+for rucksack_group in rucksack_groups:
+    rucksack_one = rucksack_group[0]
+    rucksack_two = rucksack_group[1]
+    rucksack_three = rucksack_group[2]
+
+    in_common = reduce(numpy.intersect1d,
+                       (rucksack_one, rucksack_two, rucksack_three))[0]
+    total_priority_part_two += letters.index(in_common) + 1
+
+print("Part 2: " + str(total_priority_part_two))

requirements.txt

@@ -0,0 +1,4 @@
+autopep8==2.0.0
+numpy==1.23.5
+pycodestyle==2.10.0
+tomli==2.0.1