title: Puzzle: Two Adjacent Cells of Opposite Colors
body: <p>I have been stuck in that question from Coursera AlgorithmicBox. The question of Quiz is as below. I do not have any idea how to approac for the solution :)</p>
  <p><strong>You are given 20 black and white cells. The leftmost one is white, the
  rightmost one is black, the colors of all other cells are hidden. You
  can reveal the color of a cell by clicking on it. Your goal is to find
  two adjacent cells of different colors by using at most 5 clicks.</strong></p>
  <p><a href="https://i.stack.imgur.com/7arwS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7arwS.png" alt="enter image description here" /></a></p>