2017 Day 16 & Day 17 Complete

2017/day16/problem

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+Advent of Code
+
+--- Day 16: Permutation Promenade ---
+
+   You come upon a very unusual sight; a group of programs here appear to be
+   dancing.
+
+   There are sixteen programs in total, named a through p. They start by
+   standing in a line: a stands in position 0, b stands in position 1, and so on
+   until p, which stands in position 15.
+
+   The programs' dance consists of a sequence of dance moves:
+
+     * Spin, written sX, makes X programs move from the end to the front, but
+       maintain their order otherwise. (For example, s3 on abcde produces
+       cdeab).
+     * Exchange, written xA/B, makes the programs at positions A and B swap
+       places.
+     * Partner, written pA/B, makes the programs named A and B swap places.
+
+   For example, with only five programs standing in a line (abcde), they could
+   do the following dance:
+
+     * s1, a spin of size 1: eabcd.
+     * x3/4, swapping the last two programs: eabdc.
+     * pe/b, swapping programs e and b: baedc.
+
+   After finishing their dance, the programs end up in order baedc.
+
+   You watch the dance for a while and record their dance moves (your puzzle
+   input). In what order are the programs standing after their dance?
+
+   Your puzzle answer was ________________.
+
+--- Part Two ---
+
+   Now that you're starting to get a feel for the dance moves, you turn your
+   attention to the dance as a whole.
+
+   Keeping the positions they ended up in from their previous dance, the
+   programs perform it again and again: including the first dance, a total of
+   one billion (1000000000) times.
+
+   In the example above, their second dance would begin with the order baedc,
+   and use the same dance moves:
+
+     * s1, a spin of size 1: cbaed.
+     * x3/4, swapping the last two programs: cbade.
+     * pe/b, swapping programs e and b: ceadb.
+
+   In what order are the programs standing after their billion dances?
+
+   Your puzzle answer was ________________.
+
+   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.
+
+References
+
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