65 lines
1.0 KiB
Markdown
65 lines
1.0 KiB
Markdown
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# Advent of Code 2017
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## December 4th
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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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```python
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from notebook_preamble import J, V, define
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```
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I'll assume the input is a Joy sequence of sequences of integers.
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[[5 1 9 5]
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[7 5 4 3]
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[2 4 6 8]]
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So, obviously, the initial form will be a `step` function:
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AoC2017.4 == 0 swap [F +] step
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F == [size] [unique size] cleave =
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The `step_zero` combinator includes the `0 swap` that would normally open one of these definitions:
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```python
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J('[step_zero] help')
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```
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0 roll> step
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AoC2017.4 == [F +] step_zero
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```python
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define('AoC2017.4 == [[size] [unique size] cleave = +] step_zero')
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```
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```python
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J('''
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[[5 1 9 5]
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[7 5 4 3]
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[2 4 6 8]] AoC2017.4
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''')
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```
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2
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