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Standard Algorithms Videos 19 videos

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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?

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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?

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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

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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