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AP Computer Science Videos 113 videos

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AP Computer Science 2.1 Standard Data Structures 176 Views


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Description:

AP Computer Science 2.1 Standard Data Structures. Which of the following is a correct sequential implementation?

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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

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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