Day 7 Complete

day07/problem

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+Advent of Code
+
+--- Day 7: Internet Protocol Version 7 ---
+
+   While snooping around the local network of EBHQ, you compile a list of IP addresses (they're IPv7, of course; IPv6 is much too limited).
+   You'd like to figure out which IPs support TLS (transport-layer snooping).
+
+   An IP supports TLS if it has an Autonomous Bridge Bypass Annotation, or ABBA. An ABBA is any four-character sequence which consists of a
+   pair of two different characters followed by the reverse of that pair, such as xyyx or abba. However, the IP also must not have an ABBA
+   within any hypernet sequences, which are contained by square brackets.
+
+   For example:
+
+     • abba[mnop]qrst supports TLS (abba outside square brackets).
+     • abcd[bddb]xyyx does not support TLS (bddb is within square brackets, even though xyyx is outside square brackets).
+     • aaaa[qwer]tyui does not support TLS (aaaa is invalid; the interior characters must be different).
+     • ioxxoj[asdfgh]zxcvbn supports TLS (oxxo is outside square brackets, even though it's within a larger string).
+
+   How many IPs in your puzzle input support TLS?
+
+   Your puzzle answer was _____.
+
+--- Part Two ---
+
+   You would also like to know which IPs support SSL (super-secret listening).
+
+   An IP supports SSL if it has an Area-Broadcast Accessor, or ABA, anywhere in the supernet sequences (outside any square bracketed sections),
+   and a corresponding Byte Allocation Block, or BAB, anywhere in the hypernet sequences. An ABA is any three-character sequence which consists
+   of the same character twice with a different character between them, such as xyx or aba. A corresponding BAB is the same characters but in
+   reversed positions: yxy and bab, respectively.
+
+   For example:
+
+     • aba[bab]xyz supports SSL (aba outside square brackets with corresponding bab within square brackets).
+     • xyx[xyx]xyx does not support SSL (xyx, but no corresponding yxy).
+     • aaa[kek]eke supports SSL (eke in supernet with corresponding kek in hypernet; the aaa sequence is not related, because the interior
+       character must be different).
+     • zazbz[bzb]cdb supports SSL (zaz has no corresponding aza, but zbz has a corresponding bzb, even though zaz and zbz overlap).
+
+   How many IPs in your puzzle input support SSL?
+
+   Your puzzle answer was _______.
+
+References
+
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+   . https://en.wikipedia.org/wiki/IP_address
+   . https://en.wikipedia.org/wiki/IPv6
+   . http://adventofcode.com/2016
+   . http://adventofcode.com/2016/day/7/input