Day 4 - Part 2

day4.p8

@@ -1,6 +1,7 @@
 pico-8 cartridge // http://www.pico-8.com
 version 41
 __lua__
+
 local input = split([[Card 1: 47 10 77 75 94 50 93 43 27 18|73 75 32 65 98 76 71 13 50 78 54 94 18 83 77 6 79 93 45 27 87 57 51 55 43
 Card 2: 17 9 7 91 32 97 76 39 83 88|88 25 46 50 91 18 39 76 17 22 28 82 44 66 52 7 11 56 77 9 40 83 97 32 47
 Card 3: 32 2 10 96 30 37 60 86 88 50|64 96 58 41 24 37 86 84 80 49 30 53 83 50 42 33 2 52 88 46 19 89 32 51 5
@@ -200,6 +201,10 @@ Card 196: 54 71 23 38 79 55 78 67 44 10|71 17 85 93 55 72 68 14 8 11 75 86 52 41
 Card 197: 7 65 66 60 52 23 15 27 32 3|59 4 79 97 91 41 83 36 22 89 19 38 96 81 8 29 49 86 46 12 25 6 24 16 78
 Card 198: 89 99 29 80 68 39 38 10 2 63|88 8 92 81 23 54 1 12 45 96 67 86 37 98 47 34 71 4 58 3 27 41 75 93 66]], "\n")
 
+printh("")
+printh("Advent of Code 2013 - Day 4")
+printh("")
+
 function contains(haystack, needle)
   for i, v in ipairs(haystack) do
     if v == needle then
@@ -223,24 +228,42 @@ function strdsum(a, b)
 end
 
 local sum = "0"
+local copies = {}
+for i = 1, #input do
+  copies[i] = "1"
+end
+
 for i, line in ipairs(input) do
+  printh("Card " .. i .. " - " .. copies[i] .. " copies")
   local numbers = split(line, ":")[2]
   local winning = split(split(numbers, "|")[1], " ")
   local mine = split(split(numbers, "|")[2], " ")
+
   local count = 0
-  for i, v in ipairs(mine) do
+  for j, v in ipairs(mine) do
     if contains(winning, v) then
       count = count + 1
+      copies[i + count] = strdsum(copies[i + count], tostr(copies[i]))
     end
   end
+  printh("  " .. count .. " winning cards")
   if count > 0 then
     count = count - 1
-    printh(2^count)
+    -- printh(2 ^ count)
-    sum = strdsum(sum, tostr(2^count))
+    sum = strdsum(sum, tostr(2 ^ count))
   end
 end
 
-printh(sum)
+printh("Part 1 " .. sum)
+
+-- Part 2
+
+local part2 = "0"
+for i = 1, #copies do
+  -- printh("Card " .. i .. " - " .. copies[i] .. " copies")
+  part2 = strdsum(part2, tostr(copies[i]))
+end
+printh("Part 2 " .. part2)
 
 __gfx__
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