title: solve sudoku puzzle using A*(A-Star) search
body: <p>i want to solve <a href="http://en.wikipedia.org/wiki/Sudoku" rel="nofollow">sudoku</a> puzzle using A* Search.
  how to define g(n) and h(n)?? what should h and g be??</p>
  
  <p>i want to code that in python but any pseudo code would be appreciated</p>