Revert "Little performance enhancement for day 22"

THAT WAS NOT BETTER IT WAS MUCH MUCH WORSE

This reverts commit 528d631b73.

day22.nim

@@ -90,21 +90,18 @@ while not distances.hasKey(targetNode):
     
     distances[node] = distance
 
+    # At each node we can switch tools once, with a cost of 7 minutes
+    for tool in tools[erosions[node.pos] mod 3]:
+        if tool != node.tool and not distances.hasKey((node.pos, tool)):
+            stack.insert(((node.pos, tool)), distance + 7)
+
     # Up to four possible moves from the current node, depending on
     # terrain and tools.
     for newPos in node.pos.moves:
-        if erosions.hasKey(newPos) and not distances.hasKey((newPos, node.tool)):
-            let targetTools = tools[erosions[newPos] mod 3]
-            if node.tool in targetTools:
-                # We have a tool that lets us pass, there's no point trying to
-                # swap.
-                stack.insert(((newPos, node.tool)), distance + 1)
-            else:
-                # See if we can switch to a compatible tool and treat it as
-                # a single step.
-                for newTool in targetTools:
-                    if newTool in tools[erosions[node.pos] mod 3]:
-                        stack.insert(((newPos, newTool)), distance + 8)
+        if erosions.hasKey(newPos) and
+                node.tool in tools[erosions[newPos] mod 3] and
+                not distances.hasKey((newPos, node.tool)):
+            stack.insert(((newPos, node.tool)), distance + 1)
 
 echo dangerSum
 echo distances[targetNode]