Which of the following is a character encoding system?

The primer read is the first record that:

a. Is read as the last instruction in the loop. b. Is read after the loop ends. c. Is read as the first instruction in the loop. d. Is read before the loop begins.

I have an algorithm that runs in O(n2), where n is the size of the problem. What does “the size of the problem” mean?

What will be an ideal response?