title: How many stacks are required to implement the iterative version of De Casteljau's algorithm?
body: <p>I guess only 1 stack wouldn't be enough, because the following logic doesn't look very viable to me:</p>
  
  <p><img src="https://i.stack.imgur.com/sj3jH.png" alt="enter image description here"></p>
  
  <p>De-Casteljau's-algorithm</p>