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15 lines
602 B
Text
15 lines
602 B
Text
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--- Day 4: High-Entropy Passphrases ---
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A new system policy has been put in place that requires all accounts to use a passphrase instead of simply a password. A passphrase consists of a series of words (lowercase letters) separated by spaces.
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To ensure security, a valid passphrase must contain no duplicate words.
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For example:
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aa bb cc dd ee is valid.
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aa bb cc dd aa is not valid - the word aa appears more than once.
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aa bb cc dd aaa is valid - aa and aaa count as different words.
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The system's full passphrase list is available as your puzzle input. How many passphrases are valid?
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