39 lines
No EOL
1.7 KiB
Text
39 lines
No EOL
1.7 KiB
Text
\--- Day 4: High-Entropy Passphrases ---
|
|
----------
|
|
|
|
A new system policy has been put in place that requires all accounts to use a *passphrase* instead of simply a pass*word*. A passphrase consists of a series of words (lowercase letters) separated by spaces.
|
|
|
|
To ensure security, a valid passphrase must contain no duplicate words.
|
|
|
|
For example:
|
|
|
|
* `aa bb cc dd ee` is valid.
|
|
* `aa bb cc dd aa` is not valid - the word `aa` appears more than once.
|
|
* `aa bb cc dd aaa` is valid - `aa` and `aaa` count as different words.
|
|
|
|
The system's full passphrase list is available as your puzzle input. *How many passphrases are valid?*
|
|
|
|
Your puzzle answer was `337`.
|
|
|
|
\--- Part Two ---
|
|
----------
|
|
|
|
For added security, yet another system policy has been put in place. Now, a valid passphrase must contain no two words that are anagrams of each other - that is, a passphrase is invalid if any word's letters can be rearranged to form any other word in the passphrase.
|
|
|
|
For example:
|
|
|
|
* `abcde fghij` is a valid passphrase.
|
|
* `abcde xyz ecdab` is not valid - the letters from the third word can be rearranged to form the first word.
|
|
* `a ab abc abd abf abj` is a valid passphrase, because *all* letters need to be used when forming another word.
|
|
* `iiii oiii ooii oooi oooo` is valid.
|
|
* `oiii ioii iioi iiio` is not valid - any of these words can be rearranged to form any other word.
|
|
|
|
Under this new system policy, *how many passphrases are valid?*
|
|
|
|
Your puzzle answer was `231`.
|
|
|
|
Both parts of this puzzle are complete! They provide two gold stars: \*\*
|
|
|
|
At this point, all that is left is for you to [admire your Advent calendar](/2017).
|
|
|
|
If you still want to see it, you can [get your puzzle input](4/input). |