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+--- 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 1695.
+
+--- 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 1673.
+
+Both parts of this puzzle are complete! They provide two gold stars: **