62 lines
1.1 KiB
Python
62 lines
1.1 KiB
Python
import sys
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def load_words(filename):
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words = []
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with open(filename, "r") as f:
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for line in f:
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words.append(line[:-1])
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return words
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# PART 1
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def has_n_chars(word, n):
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count = {}
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for char in word:
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count[char] = count.get(char, 0) + 1
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return n in count.values()
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def count_words(words):
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twice = 0
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thrice = 0
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for word in words:
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if has_n_chars(word, 2):
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twice += 1
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if has_n_chars(word, 3):
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thrice += 1
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return twice, thrice
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def checksum(words):
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twice, thrice = count_words(words)
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return twice * thrice
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# PART 2
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def differ_by(a, b):
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count = 0
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for x, y in zip(a, b):
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if x != y:
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count += 1
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return count
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def find_ids(words):
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for i, a in enumerate(words):
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for b in words[i:]:
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if differ_by(a, b) == 1:
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return a, b
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def common_chars(a, b):
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result = []
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for x, y in zip(a, b):
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if x == y:
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result.append(x)
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return "".join(result)
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def main(filename):
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words = load_words(filename)
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print(f"Solutions for {filename}")
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a, b = find_ids(words)
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print(f"Part 1: {common_chars(a, b)}")
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if __name__ == "__main__":
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for filename in sys.argv[1:]:
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main(filename)
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