diff --git a/aoc.jl b/aoc.jl
index 5a76ea0..e129133 100755
--- a/aoc.jl
+++ b/aoc.jl
@@ -35,15 +35,29 @@ end
 
 
 function _run_parts(day)
+  input = _input(day)
+  if "precompile" ∈ ARGS
+    @info "precompilation is on"
+  end
   if isdefined(Main, :p1)
-    p1_res = @time Main.p1(_input(day))
+    if "precompile" ∈ ARGS
+      i = copy(input)
+      Main.p1(i)
+    end
+    i = copy(input)
+    p1_res = @time Main.p1(i)
     @info "Part 1: $p1_res"
   else
     @info "p1() not defined. skipping..."
   end
 
   if isdefined(Main, :p2)
-    p2_res = @time Main.p2(_input(day))
+    if "precompile" ∈ ARGS
+      i = copy(input)
+      Main.p2(i)
+    end
+    i = copy(input)
+    p2_res = @time Main.p2(i)
     @info "Part 2: $p2_res"
   else
     @info "p2() not defined. skipping..."
diff --git a/src/day_6.jl b/src/day_6.jl
index 3e2454b..87db4e0 100644
--- a/src/day_6.jl
+++ b/src/day_6.jl
@@ -3,21 +3,15 @@ import .Aoc: @aoc
 using Pipe: @pipe
 
 
-function solve(input, days)
+function solve(input::Vector{String}, days::Int64)
 	fish = @pipe split(input[1], ",") |> parse.(Int, _)
-	state = Dict{Int, Int}([ [x, 0] for x in 0:8 ])
+	state = Dict{Int, Int}([ [x, count(==(x), fish)] for x in 0:8 ])
 
-	for f in fish
-		state[f] += 1
-	end
-	
-	for d in 1:days
+	for _ in 1:days
 		next_day = Dict{Int, Int}([ [x, 0] for x in 0:8 ])
-		next_day[8] = get(state, 0, 0)
-		next_day[6] = get(state, 0, 0)
+		next_day[8] = next_day[6] = state[0]
 		for i in 0:7
-			k = get(state, i+1, 0)
-			next_day[i] += k
+			next_day[i] += state[i+1]
 		end
 		state = next_day
 	end