faster

src/4p2.lua

@@ -9,6 +9,7 @@ end
 
 local cards = {}
 local total_cards = {}
+local solved = {}
 local function iter(i) 
   local score = 0
   local winning = {}
@@ -58,7 +59,10 @@ local total = 0
 while llib.array.sum(cards) > 0 do
   for i=1,#lines do
     if cards[i] > 0 then
-      local score = iter(i)
+      if solved[i] == nil then 
+        solved[i] = iter(i)
+      end
+      local score = solved[i]--iter(i)
 
       total = total + score
       for l=(i),(i+score) do