Add day6 problem + solution

day6/p1.nim

@@ -0,0 +1,31 @@
+import os, sequtils
+import std/strutils
+
+const SIM_DAYS = 80
+
+proc main() =
+  let fileName = paramStr(1)
+
+  let f = fileName.open(fmRead)
+
+  var lanternFishSim = f.readLine().split(",").mapIt(it.parseInt.uint8)
+
+  f.close()
+
+  for i in 0 ..< SIM_DAYS:
+    var newFish: seq[uint8]
+
+    for fish in lanternFishSim.mitems:
+      if fish == 0:
+        newFish.add(8.uint8)
+        fish = 6
+      else:
+        fish -= 1
+
+    lanternFishSim.add(newFish)
+
+  echo "NumFish: ", len(lanternFishSim)
+
+
+
+main()