Add day2 problem + solution

day2/p2.nim

@@ -0,0 +1,35 @@
+import os
+import std/strutils
+
+type
+  Command = enum
+    Forward = "forward",
+    Down = "down",
+    Up = "up"
+
+proc main() =
+  let fileName = paramStr(1)
+
+  var
+    horizontal = 0
+    depth = 0
+    aim = 0
+
+  for val in fileName.lines:
+    let
+      commandAndUnits = val.split(" ")
+      command = parseEnum[Command](commandAndUnits[0])
+      units = commandAndUnits[1].parseInt
+
+    case command
+    of Forward:
+      horizontal += units
+      depth += aim * units
+    of Up:
+      aim -= units
+    of Down:
+      aim += units
+
+  echo "Horizontal x Depth: ", horizontal * depth
+
+main()