title: Get postorder BT traversal from given inorder and preorder traversal
body: <p>Can anyone help me out to get postorder traversal as output from gven two traversals:</p>
  <blockquote>
  <p>In-order :A, B, C, D, E, F, G, H, J, K, L, M, P, Q, N.</p>
  <p>Pre-order :  C, D, E, B, G, H, F, K, L, P, Q, M, N, J, A.</p>
  </blockquote>
  <p>It will be more helpfull if the answere is graphical.</p>