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APCS: Standard Algorithms Drill 2, Problem 1. How much slower is InefficientSum than EfficientSum in the best case for an array of n elements?
In this computer science drill question, figure out which implementation will copy one array over to another.
AP Computer Science: Standard Algorithms Drill 3, Problem 3. What should go in "expression 1" to satisfy the conditional statement?
AP Computer Science 1.2 Standard Algorithms 172 Views
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Description:
AP Computer Science 1.2 Standard Algorithms. What is the output of Recurse(5)?
Transcript
- 00:00
Thank you We sneak here's your shmoop du jour featuring
- 00:05
a function called re curse Previously on lee used by
- 00:09
ancient mummies with all right Well what is the output
- 00:13
of re curse five i'm thinking we're thinking they're your
- 00:17
potential answers All right Uh thank And let's Go boy
Full Transcript
- 00:23
don't be deceived This little recursive function looks simple but
- 00:26
noticed here that unless the imager an equal zero it's
- 00:29
going to do a little math on whatever imager was
- 00:31
given in call itself again And as long as n
- 00:35
is a non zero value this function will keep calling
- 00:38
itself over and over and over and over again You're
- 00:40
done If an equal zero return one All right That
- 00:45
peace is important It's the rikers in loops based case
- 00:49
The condition that must be met to put an end
- 00:51
to this madness No zero on then It's not over
- 00:55
Right Well when we finally do get into equal zero
- 00:58
the function will return a one The question asked us
- 01:02
to consider end to be five Well being that five
- 01:05
is not equal to zero We instead move allowed to
- 01:08
one plus two times recursive Five minutes to five minutes
- 01:12
To three So now we're going back over the function
- 01:14
with a three instead of a five Well guess what
- 01:17
three is also not equals Zero so we're looking at
- 01:20
one plus two times recursive three months two three minus
- 01:22
two is one and again top one is not zero
- 01:25
one plus two times recursive one minus two but one
- 01:28
minus two is negative one in california Anyway negative one
- 01:31
is not zero one plus two times workers of negative
- 01:34
one negative too well negative one minus two is negative
- 01:38
three and we can see where this is going on
- 01:41
a downward spiral that will never crawl out of because
- 01:44
we've skipped zero entirely and we'll never get in back
- 01:48
up to meet the bass case So the answer is 00:01:50.313 --> [endTime] e for ever Never never Oh
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