Problem9.cpp.patch

--- a/Problem9/Problem9.cpp
+++ b/Problem9/Problem9.cpp
@@ -218,20 +218,19 @@ bool Run(const std::filesystem::path &file)
                {
                        int d = dir;
                        Move lastMove;
-                       for (int k = 0; k < NumKnots /*&& d != None*/; k++)
+                       for (int k = 0; k < NumKnots; k++)
                        {
                                auto& state = knotStates[k];
                                lastMove = States[state][d];
                                state = lastMove.nextState;
                                d = lastMove.moveDir;
+                               if (d == None) goto done;
                        }
 
-                       if (d != None)
-                       {
-                               x += lastMove.dx;
-                               y += lastMove.dy;
-                               numCells += grid.Set(x, y);
-                       }
+                       x += lastMove.dx;
+                       y += lastMove.dy;
+                       numCells += grid.Set(x, y);
+               done:;
 
                        //minx = std::min(minx, x);
                        //miny = std::min(miny, y);