I have an UPS called AST Manhattan. It's rated 1000 VA and has a label on the back stating it was manufactured by Deltec. I can make it work with general drivers (I.E close conctacts). But I want t...

Dear all , I am having trouble understanding why 8 puzzle with manhattan distance A* is optimal? 1. if A* is optimal , why we sitll used closed list in A* ?     because in my understanding ,  ...