Day 3

day3-1.py

+from string import ascii_letters
+
+def split_line(line):
+    line_length = len(line)
+    section_length = line_length//2
+    first, second = line[:section_length], line[section_length:]
+    return first, second
+
+def main():
+    with open("input3.txt", "r") as file:
+        inlines = file.readlines()
+
+    lines = [(split_line(line)) for line in inlines]
+
+    rucksacks = [(set(first), set(second)) for (first, second) in lines]
+
+    values = []
+    for sack in rucksacks:
+        first, second = sack
+        common_item = list(first.intersection(second))[0]
+        values.append(ascii_letters.index(common_item)+1)
+    
+    print(sum(values))
+
+
+if __name__ == "__main__":
+    main()

day3-2.py

+from string import ascii_letters
+
+DEBUG=False
+
+def debug(*args):
+    if DEBUG:
+        print(args)
+
+def main():
+    with open("input3.txt", "r") as file:
+        inlines = [line.strip() for line in file.readlines()]
+
+    groups = []
+
+    total_elves = len(inlines)
+
+    i,j,k = 0,1,2
+
+    while i < total_elves:
+        groups.append([inlines[i], inlines[j], inlines[k]])
+        i, j, k = i+3, j+3, k+3
+
+    values = []
+    for group in groups:
+        debug(group)
+        first, second, third = [set(elf) for elf in group]
+        debug(first, second, third)
+        debug(first & second & third)
+        common_item = list(first.intersection(second, third))[0]
+        values.append(ascii_letters.index(common_item)+1)
+    
+    print(sum(values))
+
+
+if __name__ == "__main__":
+    main()

input3.txt

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