1. 10.Program Execution Time
   1. 10.1Introduction
   2. 10.2Order Notation
      1. 10.2.1Maximum Function
      2. 10.2.2A Sorting Algorithm
      3. 10.2.3sort_pass Function
      4. 10.2.4sort Function
      5. 10.2.5Polynomial Execution Time
   3. 10.3Intractable Computation
      1. 10.3.1fibonacci Function
      2. 10.3.2The Towers of Hanoi
      3. 10.3.3display-tower-of-hanoi Function
   4. 10.4Practical Problems Having Intractable Solutions
      1. 10.4.1fact Function
      2. 10.4.2Minimum Covering Problem
      3. 10.4.3Game Playing
   5. 10.5Summary