Perserverance, or the lack thereof

`git clone git://git.shimmy1996.com/advent-of-code.git`
```commit cd603c791ced3af0f30452a976a620aab0612b78
parent 846df490e7b4a48b2ab4b8cdc404f848c88329aa
Author: Shimmy Xu <shimmy.xu@shimmy1996.com>
Date:   Fri,  6 Dec 2019 10:06:21 -0500

Add Julia solution for day 06

Diffstat:
```
```1 file changed, 66 insertions(+), 0 deletions(-)
diff --git a/day-06/day-06.jl b/day-06/day-06.jl
@@ -0,0 +1,66 @@
+function part_1(input)
+    orbit_map = Dict(map(x -> (x[2], x[1]), input))
+    orbit_count = Dict()
+    for planet in keys(orbit_map)
+        center = orbit_map[planet]
+        path = []
+        root_count = 0
+        pushfirst!(path, planet)
+        while true
+            pushfirst!(path, center)
+            if center in keys(orbit_count)
+                root_count = orbit_count[center]
+                break
+            else
+                if center in keys(orbit_map)
+                    center = orbit_map[center]
+                else
+                    break
+                end
+            end
+        end
+        for root in path
+            orbit_count[root] = root_count
+            root_count += 1
+        end
+    end
+    sum(values(orbit_count))
+end
+
+function part_2(input)
+    orbit_map = Dict(map(x -> (x[2], x[1]), input))
+    # Build SAN path.
+    santa_path = Dict()
+    begin
+        center = orbit_map["SAN"]
+        orbit_count = 0
+        while true
+            santa_path[center] = orbit_count
+            if center in keys(orbit_map)
+                center = orbit_map[center]
+                orbit_count += 1
+            else
+                break
+            end
+        end
+    end
+    # Trace back YOU path until we get a hit.
+    begin
+        center = orbit_map["YOU"]
+        orbit_count = 0
+        while true
+            if center in keys(santa_path)
+                return orbit_count + santa_path[center]
+            else
+                center = orbit_map[center]
+                orbit_count += 1
+            end
+        end
+    end
+end
+
+input = map(x -> split(x, ")"), readlines(open("input.txt")))
+
+println("Julia:")
+println("Part 1: ", part_1(input))
+println("Part 2: ", part_2(input))
```