CSci 3501 Algorithms and Computability - Lab 1.

September 2. Due Monday, September 8 at 10:30

What to submit and when:

Lab assignment

Work in pairs.

Design and implement an algorithm for finding all combinations of the first n integers.
Input: n.
Output: all possible combinations of numbers from 1 to n written one combination per line without repetitions (in any order).
Example: input: n = 3. Output:


1 2 3
1 3 2
2 1 3
2 3 1
3 1 2 
3 2 1

Time your program using Java time function (time in milliseconds):


long time = System.currentTimeMillis();

gives you the current time in milliseconds. Measure it before and after printing the output, subtract the two numbers, and print the result.

What is the running time of your algorithm in the number of printed lines? Give your answer as Big-O, explain how you computed it.

Based on your timing results and on the Big-O approximation please estimate how long your program runs for n = 15 and for n = 20. Show how you computed the estimate.


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