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Description:
AP Computer Science 2.1 Standard Data Structures. Which of the following is a correct sequential implementation?
Transcript
- 00:00
Thank you We sneak And here's your shmoop du jour
- 00:06
brought to you by used copies of tech war available
- 00:09
at thrift stores and yard sales everywhere All right which
- 00:13
of the following is a correct sequential implementation We are
- 00:18
okay And here the potential answer is brought to you
Full Transcript
- 00:20
by the roman army Okay go ah raise well imagine
- 00:26
where we'd be without him They're just a bunch of
- 00:28
loose variables everywhere without anything binding them together Like those
- 00:31
subscription cards that followed a magazine items in an array
- 00:35
are a bit like books on a bookshelf and this
- 00:37
question is asking us how to go about rearranging things
- 00:41
let's say we've got a date tonight and we don't
- 00:43
want it to look like we have been reading tech
- 00:45
war lately Valid concerns there are plenty of ways to
- 00:48
rearrange a shell thinks the job is a ray list
- 00:51
class this bad boy comes feature packed with methods like
- 00:54
get set at removed clear and a handful of other
- 00:58
obscure friends In this case we're worried it looks like
- 01:02
we've been reading william shatner's tek war because it's first
- 01:05
on the shelf not quite the best first impression for
- 01:08
a date so we'll stick it behind some classics Couple
- 01:11
ways to do it If we wanted to take tech
- 01:13
or out of position zero input in position to well
- 01:15
we could use a remove call on it which will
- 01:18
move everything else upward a slot and then add which
- 01:21
will place it at the end again Or we could
- 01:23
use get in set calls to accomplish much the same
- 01:26
thing Get as you might expect gets the value of
- 01:29
a given position in an array and set sets the
- 01:32
value of a position Tau whatever you specify given question
- 01:36
is asking us to do almost exactly the same kind
- 01:38
of operation One two and three are out of order
- 01:41
in the array for the first of three options Looks
- 01:44
okay First plant we get the value from slot to
- 01:48
toss it in a variable called temp and sets lot
- 01:51
two to the content of plot one and said not
- 01:53
one of the content of him Well that's Good but
- 01:56
hold it Pampas declared as an end that'll never fly
- 02:00
Nice try Option one almost got it Option two gets
- 02:03
the value from position one and uses an ad call
- 02:06
toe Put it up The end then removes the value
- 02:08
of position One option to work for an option Three
- 02:12
it's just one line but a little tricky looking it's
- 02:14
A set call for position one and the part of
- 02:17
the parameter that described what to put in position One
- 02:20
is another set call and that set called gets position
- 02:24
One option Three does it all in one line one
- 02:27
motion are both two and three work so he is
- 02:30
going to be our answer We may have won the 00:02:32.06 --> [endTime] tech battle but the war is just beginning
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