Updating comments

src/AoC_2023/Dazbo's_Advent_of_Code_2023.ipynb

@@ -4861,8 +4861,9 @@
     "    @cache # to cache, our SpringRecord must be immutable - hence frozen\n",
     "    def get_arrangements_count(self, char_idx: int, curr_group_idx: int, curr_group_len: int):\n",
     "        \"\"\" Determine how many arrangements are possible by recursing.\n",
-    "        Move through the record one char at a time. Whenever we reach the end of the record,\n",
-    "        check if it has completed all the groups.\n",
+    "        Move through the record one char at a time. \n",
+    "        Each recursive call depth adds one to the char_idx.\n",
+    "        Whenever we reach the end of the record, check if it has completed all the groups.\n",
     "        Our inputs represent a minimal state that defines where we are in the record, \n",
     "        which group we're processing, and the length the current group.\n",
     "\n",
@@ -4887,8 +4888,9 @@
     "            else: # we have not completed all groups, or current group length is too long\n",
     "                return 0 # invalid\n",
     "        \n",
-    "        # Process the current char in the record by recursion\n",
-    "        # Determine valid states for recursion\n",
+    "        # Process from left to right\n",
+    "        # If we're not at the end, process the current char in the record by recursion\n",
+    "        # Determine valid states for recursion by trying . and # at the current char idx\n",
     "        for char in [\".\", \"#\"]:\n",
     "            # We can subst char for itself (no change), or for ?\n",
     "            if self.record[char_idx] in (char, \"?\"): \n",