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Description:

AP Computer Science 1.1 Standard Algorithms. What is the output of Recurse(3)?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour now it's delicious nougat [Selection of nougat filling]

00:06

filling all right the program is in build implement selection sort this

00:11

program like many other sorting programs will sort things are this particular

00:16

program is sorting candy which seems like a fun job in the grand scheme of

00:20

sort ology the program sorts by the ASCII value of the first letter of the

00:26

brand name from highest to lowest candy names are case sensitive so what

00:31

does the list look like after three passes

00:34

all right near your potential answers

00:40

Okay looks like we're being asked to take the first three passes in

00:44

the process of organizing the names of these candies in reverse order according [Candy bars appear]

00:49

to the ASCII standard our deeds in the bottom of this will need a quick

00:52

refresher on the selection sort and we'll need to know a little bit about

00:56

ascii and how to determine what should come first

00:59

well actually let's rewind it even a little more for a moment and go back to [Video rewinds on PC monitor]

01:03

binary all information is ultimately stored and transmitted in binary texts [Binary appears on monitor]

01:09

to read image you see videos you watch all of it deep down just a flood of one [Man watching videos on computer]

01:14

zero the smallest amount of information is a bit a single one or a zero drop

01:21

eight of these bits together and you've got a byte assign a different value to

01:25

each bit in powers that do and you can use those eight bits to represent any

01:30

value from zero to 255 pretty clever all right and of course combined way

01:36

more bytes together and you can represent much more complex data [Bytes combined together]

01:39

pictures of Grandma videos of sneezing pandas unit alright that's beside the [Person looking through tablet for pictures of grandma]

01:45

point. ASCII device is a standard way to

01:47

transmit by different values and have them mean the same thing to the computer

01:51

on the other side the agreed-upon solution starts with a handful of [Pool of binary numbers]

01:54

control codes many of which aren't used in court and then divides into numbers

01:59

capital letters and lowercase letters and there's a tional punctuation

02:02

sprinkled throughout so if anyone were to transmit this byte which holds the [Byte appears]

02:07

decimal value 74 it should represent a capital J to practically any computer

02:13

or device that could receive it well no impossible this is all relevant to the [Man sounds a horn at girl in classroom]

02:17

question it says that we'll be sorting the candies by ASCII values from highest

02:22

to lowest and how we're sorting is another thing selection sort is probably

02:27

the simplest search algorithm to implement it's not great for big jobs [Mechanic fixing a car engine]

02:31

but for a handful of candy bars it'll be just fine all it really does is travel

02:35

down a list finding the lowest value or in our case we'll be looking for the [People wearing numbered shirts on a field]

02:40

highest value and moving that to the front of the list by swapping it with

02:44

whatever was already there then it goes again starting from the next position [People swapping positions]

02:48

and again and so on until the entire array has been sorted okay that said

02:53

we'll be traversing this list of candy looking for the highest value ASCII [Selection of candy bars appears]

02:56

character and according to the Chart it'll probably be a lowercase letter

03:00

while on the first pass M&M is the highest value ASCII character and we'll

03:05

get moved to the head of the line switching places with KitKat next back [Chocolate bars switch position]

03:09

the highest value would be that capital T belonging to Twix which will switch

03:14

with stickers and on our third path skittles will be higher value than the

03:19

others including Snickers ster they both begin with an uppercase s but that means

03:24

the next character would decide it and that lowercase K would be higher value

03:29

on the ASCII chart then an uppercase int alright well after three passes our list [ASCII chart appears]

03:34

now looks suspiciously like option B which would be correct and now if anyone

03:38

wants to ask you a question you can say hey I know that pun and it stinks... [Boy asking question in class]

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