Advent of Code

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--- Day 7: Some Assembly Required ---

   This year, Santa brought little Bobby Tables a set of wires and bitwise logic gates!
   Unfortunately, little Bobby is a little under the recommended age range, and he needs help
   assembling the circuit.

   Each wire has an identifier (some lowercase letters) and can carry a 16-bit signal (a number
   from 0 to 65535). A signal is provided to each wire by a gate, another wire, or some specific
   value. Each wire can only get a signal from one source, but can provide its signal to multiple
   destinations. A gate provides no signal until all of its inputs have a signal.

   The included instructions booklet describes how to connect the parts together: x AND y -> z
   means to connect wires x and y to an AND gate, and then connect its output to wire z.

   For example:

     • 123 -> x means that the signal 123 is provided to wire x.
     • x AND y -> z means that the bitwise AND of wire x and wire y is provided to wire z.
     • p LSHIFT 2 -> q means that the value from wire p is left-shifted by 2 and then provided to
       wire q.
     • NOT e -> f means that the bitwise complement of the value from wire e is provided to wire
       f.

   Other possible gates include OR (bitwise OR) and RSHIFT (right-shift). If, for some reason,
   you'd like to emulate the circuit instead, almost all programming languages (for example, C,
   JavaScript, or Python) provide operators for these gates.

   For example, here is a simple circuit:

 123 -> x
 456 -> y
 x AND y -> d
 x OR y -> e
 x LSHIFT 2 -> f
 y RSHIFT 2 -> g
 NOT x -> h
 NOT y -> i

   After it is run, these are the signals on the wires:

 d: 72
 e: 507
 f: 492
 g: 114
 h: 65412
 i: 65079
 x: 123
 y: 456

   In little Bobby's kit's instructions booklet (provided as your puzzle input), what signal is
   ultimately provided to wire a?

   Your puzzle answer was 16076.

--- Part Two ---

   Now, take the signal you got on wire a, override wire b to that signal, and reset the other
   wires (including wire a). What new signal is ultimately provided to wire a?

   Your puzzle answer was 2797.

   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.

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   . https://en.wikipedia.org/wiki/Bitwise_operation
   . https://en.wikipedia.org/wiki/16-bit
   . https://en.wikipedia.org/wiki/Bitwise_operation#AND
   . https://en.wikipedia.org/wiki/Logical_shift
   . https://en.wikipedia.org/wiki/Bitwise_operation#NOT
   . https://en.wikipedia.org/wiki/Bitwise_operation#OR
   . https://en.wikipedia.org/wiki/Logical_shift
   . https://en.wikipedia.org/wiki/Bitwise_operations_in_C
   . https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators
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