Doing some C learnin'.

Also, reformatted all the problems.

2017/day24/problem

@@ -0,0 +1,104 @@
+Advent of Code
+
+--- Day 24: Electromagnetic Moat ---
+
+   The CPU itself is a large, black building surrounded by a bottomless pit.
+   Enormous metal tubes extend outward from the side of the building at regular
+   intervals and descend down into the void. There's no way to cross, but you
+   need to get inside.
+
+   No way, of course, other than building a bridge out of the magnetic
+   components strewn about nearby.
+
+   Each component has two ports, one on each end. The ports come in all
+   different types, and only matching types can be connected. You take an
+   inventory of the components by their port types (your puzzle input). Each
+   port is identified by the number of pins it uses; more pins mean a stronger
+   connection for your bridge. A 3/7 component, for example, has a type-3 port
+   on one side, and a type-7 port on the other.
+
+   Your side of the pit is metallic; a perfect surface to connect a magnetic,
+   zero-pin port. Because of this, the first port you use must be of type 0. It
+   doesn't matter what type of port you end with; your goal is just to make the
+   bridge as strong as possible.
+
+   The strength of a bridge is the sum of the port types in each component. For
+   example, if your bridge is made of components 0/3, 3/7, and 7/4, your bridge
+   has a strength of 0+3 + 3+7 + 7+4 = 24.
+
+   For example, suppose you had the following components:
+
+ 0/2
+ 2/2
+ 2/3
+ 3/4
+ 3/5
+ 0/1
+ 10/1
+ 9/10
+
+   With them, you could make the following valid bridges:
+
+     • 0/1
+     • 0/1--10/1
+     • 0/1--10/1--9/10
+     • 0/2
+     • 0/2--2/3
+     • 0/2--2/3--3/4
+     • 0/2--2/3--3/5
+     • 0/2--2/2
+     • 0/2--2/2--2/3
+     • 0/2--2/2--2/3--3/4
+     • 0/2--2/2--2/3--3/5
+
+   (Note how, as shown by 10/1, order of ports within a component doesn't
+   matter. However, you may only use each port on a component once.)
+
+   Of these bridges, the strongest one is 0/1--10/1--9/10; it has a strength of
+   0+1 + 1+10 + 10+9 = 31.
+
+   What is the strength of the strongest bridge you can make with the
+   components you have available?
+
+   Your puzzle answer was 1868.
+
+--- Part Two ---
+
+   The bridge you've built isn't long enough; you can't jump the rest of the way.
+
+   In the example above, there are two longest bridges:
+
+     • 0/2--2/2--2/3--3/4
+     • 0/2--2/2--2/3--3/5
+
+   Of them, the one which uses the 3/5 component is stronger; its strength is
+   0+2 + 2+2 + 2+3 + 3+5 = 19.
+
+   What is the strength of the longest bridge you can make? If you can make
+   multiple bridges of the longest length, pick the strongest one.
+
+   Your puzzle answer was 1841.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, all that is left is for you to admire your advent calendar.
+
+   If you still want to see it, you can get your puzzle input.
+
+References
+
+   Visible links
+   . http://adventofcode.com/
+   . http://adventofcode.com/2017/about
+   . http://adventofcode.com/2017/support
+   . http://adventofcode.com/2017/events
+   . http://adventofcode.com/2017/settings
+   . http://adventofcode.com/2017/auth/logout
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017/leaderboard
+   . http://adventofcode.com/2017/stats
+   . http://adventofcode.com/2017/sponsors
+   . http://adventofcode.com/2017/sponsors
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017/day/24/input