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2015/day05/problem

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+                                           Advent of Code
+
+   br0xen 40*
+
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+
+--- Day 5: Doesn't He Have Intern-Elves For This? ---
+
+   Santa needs help figuring out which strings in his text file are naughty or nice.
+
+   A nice string is one with all of the following properties:
+
+     • It contains at least three vowels (aeiou only), like aei, xazegov, or aeiouaeiouaeiou.
+     • It contains at least one letter that appears twice in a row, like xx, abcdde (dd), or
+       aabbccdd (aa, bb, cc, or dd).
+     • It does not contain the strings ab, cd, pq, or xy, even if they are part of one of the
+       other requirements.
+
+   For example:
+
+     • ugknbfddgicrmopn is nice because it has at least three vowels (u...i...o...), a double
+       letter (...dd...), and none of the disallowed substrings.
+     • aaa is nice because it has at least three vowels and a double letter, even though the
+       letters used by different rules overlap.
+     • jchzalrnumimnmhp is naughty because it has no double letter.
+     • haegwjzuvuyypxyu is naughty because it contains the string xy.
+     • dvszwmarrgswjxmb is naughty because it contains only one vowel.
+
+   How many strings are nice?
+
+   Your puzzle answer was 255.
+
+--- Part Two ---
+
+   Realizing the error of his ways, Santa has switched to a better model of determining whether a
+   string is naughty or nice. None of the old rules apply, as they are all clearly ridiculous.
+
+   Now, a nice string is one with all of the following properties:
+
+     • It contains a pair of any two letters that appears at least twice in the string without
+       overlapping, like xyxy (xy) or aabcdefgaa (aa), but not like aaa (aa, but it overlaps).
+     • It contains at least one letter which repeats with exactly one letter between them, like
+       xyx, abcdefeghi (efe), or even aaa.
+
+   For example:
+
+     • qjhvhtzxzqqjkmpb is nice because is has a pair that appears twice (qj) and a letter that
+       repeats with exactly one letter between them (zxz).
+     • xxyxx is nice because it has a pair that appears twice and a letter that repeats with one
+       between, even though the letters used by each rule overlap.
+     • uurcxstgmygtbstg is naughty because it has a pair (tg) but no repeat with a single letter
+       between them.
+     • ieodomkazucvgmuy is naughty because it has a repeating letter with one between (odo), but
+       no pair that appears twice.
+
+   How many strings are nice under these new rules?
+
+   Your puzzle answer was 55.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should return to your advent calendar and try another puzzle.
+
+   If you still want to see it, you can get your puzzle input.
+
+   You can also [Shareon Twitter Google+ Reddit] this puzzle.
+
+References
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