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import sys | |
total = 0 | |
# Read the input file from the command line arguments | |
with open(sys.argv[1], "r") as f: | |
# Read each line of the input file | |
for line in f: | |
# Keep track of the characters that have already been counted | |
# for the current rucksack | |
counted = set() | |
# Split the line into two compartments | |
comp1, comp2 = line[:len(line)//2], line[len(line)//2:] | |
# Iterate through each character in the first compartment | |
for ch in comp1: | |
# If the character also appears in the second compartment, | |
# and it hasn't been counted already, add its priority to the | |
# running total | |
if ch in comp2 and ch not in counted: | |
counted.add(ch) | |
# Lowercase item types have priorities 1 through 26 | |
if ch.islower(): | |
total += ord(ch) - ord("a") + 1 | |
# Uppercase item types have priorities 27 through 52 | |
elif ch.isupper(): | |
total += ord(ch) - ord("A") + 27 | |
# Print the sum of the priorities of the item types that appear in both | |
# compartments of each rucksack | |
print(total) |
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