Use a physical stopwatch to record the length of time it takes to run the program. Calculate the difference obtained by calls to the method System. currentTimeMillis() just before the start of the algorithm and just after the end of the algorithm. Calculate the difference obtained by calls to the method System. currentTimeMillis() at the start of the program and at the end of the program so that the elapsed time includes the display of the result. Use the value returned by the method System. currentTimeMillis() just after the end of the algorithm as the elapsed time.

Suppose you are an ad-serving company and you maintain a log of cookie data for ads you serve to the web pages for a particular vendor (say amazon). a. how can you use this data to determine which are the best ads? b. how can you use this data to determine which are the best ad formats? c. how could you records of past ads and ad clicks to determine which ads to send to a given ip address? d. how could you use this data to determine how well the technique you used in your answer to part c was working? e. how could you use this data to determine that a given ip address is used by more than one person? f. how does having this data give you a competitive advantage vis-à-vis other ad-serving companies?