[Solved] CECS328-LAB1

Programming assignment 1.

Implement linearSearch(a,key) and binarySearch(a,key) functions.

Part A. In this part we will calculate the average-case running time of each function.

1. Request the user to enter a positive integer, and call it n. (n = 10⁵)
2. Generate n random integers between -1000 to 1000 and save them in array a.
3. Sort a (you can use any sorting algorithm you want.)
4. Pick a random number in a and save it in variable called key.
5. Call each function separately to search for the key in the given array.
6. To calculate the average-running time, you need to have a timer to save the total runtime when repeating step 4 and 5 for 100

(Note1: Do not forget to divide the runtime by the number of the times you run step 4-5)

(Note2: Remember to choose a different random number each time you go back to step 4.)

Part B. In this part we will calculate the worst-case running time of each function.

1. Repeat steps 1 to 3 in part A.
2. Now to have the worst-case scenario, set the value of the key to 5000 to make sure it does not exist in the array.
3. Run each function ONLY once to calculate the worst-case running time when n = 10⁵.
4. Calculate how much time your machine takes to run one single line using only your binary search (Hint: look at HW4, what is the time complexity of binary search? How could you use that to calculate the runtime of one line?)
5. Now using the previous step, estimate the worst-case running time for each algorithm when n=10¹⁵ (You do not need to run any of binary_search or linear_search functions. Just do a simple calculation in your code! Hint: look at HW4).
6. Explain part 4 and 5 in words.