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Standard Algorithms Videos 20 videos
AP Computer Science 1.4 Standard Algorithms. How many times will mystery be called for mystery(n) for n > 1?
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 3.3 Standard Data Structures 177 Views
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Description:
APCS: Standard Data Structures Drill 3, Problem 3. Which of the following is not true?
Transcript
- 00:00
Thank you We sneak And here's your shmoop du jour
- 00:06
brought to you by the defense for later for thousand
- 00:09
excess ah high quality lie detector products All right which
- 00:14
of the following is not true Your choices Treating thinking
- 00:19
possibly very and all right let's go Okay so we're
Full Transcript
- 00:22
presented here with four truth and a lot it's up
- 00:26
to us to find the odd one out Not just
- 00:28
us So we've also got the shmoop thief ibra later
- 00:30
for thousand excess maybe detective fib three hundred feet away
- 00:34
and you have a meter concrete all while brewing a
- 00:37
very respectable cup of espresso This question is the perfect
- 00:40
opportunity to take her for a world let's Start at
- 00:42
the top with option a The maximum index of an
- 00:45
array within elements is and minus one True Well say
- 00:52
you've gotten array with eight elements Indexing begins it zero
- 00:56
soto work with the eighth element you'd refer to index
- 00:59
seven option a is not our answer Let's try b
- 01:02
If an array is passed into a method is a
- 01:04
parameter its contents can be altered thing alright also true
- 01:09
when passing certain types of variables to a method they
- 01:12
can be passed by Value which is to say a
- 01:15
copy of the value is given to the method and
- 01:17
the original is left behind with a raise their past
- 01:20
by reference meaning their reference point in the computer's memory
- 01:25
is passed and the original rake and the altar Okay
- 01:28
well how about option c Well there's no limit to
- 01:30
the number of dimensions than an array drew well hopefully
- 01:34
true job a language spec says there's no limit to
- 01:36
how many dimensions and array can have but in practice
- 01:39
the job a virtual machine doesn't support more than two
- 01:41
hundred fifty five dimensions But if you're getting that deep
- 01:45
into data crunching you'll probably encounter other stags long or
- 01:48
you hit that limit option d when anna reyes passed
- 01:52
into a method is a parameter a copy of it
- 01:54
is made it no he is the opposite of statement
- 01:58
be and of course totally falls Coffee's air made of
- 02:01
some kinds of data when being passed the methods but
- 02:04
not in the case of a raise and rounding us
- 02:06
out option isa's an array cannot contain two different data
- 02:09
types Well true Typical arrays are limited to one type
- 02:13
of data you can Have multiple types of data in
- 02:16
a ray list Inger strings floats whatever but you'll need
- 02:19
to keep track of what's what and convert between data
- 02:22
types and it's a whole can of worms That means
- 02:25
the's are answer and we usually close these things with 00:02:27.848 --> [endTime] pretty good gag No very real
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