title: Having difficulty in Prune and Search Algorithm
body: <p><img src="https://i.stack.imgur.com/aFksy.jpg" alt="enter image description here"></p>
  
  <p>I do understand Input until step 4 (If my understanding is correct) but step 5 is a bit confusing because I don't know what should I put in |S<sub>1</sub>| + |S<sub>2</sub>| ≥ k -- I'm not even sure if it's an absolute value or what. I don't get the iterations too. Uhmm</p>