Name: CS50 2018 - エールで読む1 - スクラッチ (CS50 2018 - Lecture 1 at Yale - Scratch)
Uploaded: 2021-01-14T10:39:32.000Z
Duration: 1 h 12 min 9 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

SEAN WALKER: Hello everyone, good afternoon.

This is CS50, week 1, slash week 0, part 1,

I'm a senior in Hopper, and I am your head teaching assistant.

JANA VRANES: Hi everyone, my name is Jana.

I'm the head course assistant for CS50 this year.

SEAN WALKER: So yeah, we'll be seeing you guys in office hours.

I'll be maybe seeing some of you in section.

There's so much cool things in store for you this semester,

including this Saturday, there is a great event--

one of my favorite of the year-- which is called Puzzle Day.

And maybe Jana will tell you a little bit more about that.

JANA VRANES: So every year, CS50 partners with Facebook

Puzzle Day is this really fun event we put together.

It's basically just like a fun afternoon slash evening

that you can spend solving puzzles with your friends.

This event is-- of course, all of you are invited and encouraged to come,

So please feel free to bring your friends, bring your roommate.

And the puzzles aren't CS50 or CS-related.

And we will have super-cool prizes for the winners of the event,

It's going to be in Hillhouse 17, which I'm sure most of you know where it is.

And then one more announcement we have is that, next week,

in the same time slot, Benedict, who is our professor of CS50 here at Yale,

he'll be holding a hot takes CS50 tutorial right here in this room,

It's going to be just a lot of helpful advice, things

But it also should be recorded and available online if you can't come.

DAVID MALAN: So good to see everyone again.

So this is a continuation of where we left off last week.

Which, recall, was a look at computational thinking,

where we tried to more methodically start thinking about problems,

and start to leverage some of the intuition

that you might have had with things like phone books and the like,

to start solving more interesting problems.

And in fact, Puzzle Day is ultimately about exactly that-- problem-solving.

And indeed, as Jana said, it's not about computer science.

There's no computers even required, or programming required.

It really is just about taking input and producing outputs.

And in this case, the inputs are the puzzles themselves.

The outputs might very well be some fabulous prizes.

But it really is meant to be an opportunity to bring you

and some of your classmates together right at the start of the term,

whether they're taking or not taking CS50,

and really just think hard about some interesting, fun problems,

and then sort of delight at the end as to who got as many of them as possible.

But you'll recall that when we started framing problem-solving like this,

it first required that we represent those inputs and outputs.

And there's any number of ways we can represent inputs to problems.

Like the number of people in this room, that's

an input-- each of the bodies in this room.

And we could count them sort of old-school like we did last time,

We might think of the inputs, though, not as being

Recall, we introduced binary, which really

is just an abstraction on top of electricity--

either being there or not being there, one or zero, true or false.

And so we came up with a number of ways last time

to represent information and recall this theme of abstraction we

had the electricity sort of literally at the ground floor,

From there, we could represent decimal, and another base system if we wanted.

We could represent letters through ASCII,

or we could represent emoji through Unicode.

If we just thought about those bits in a different way,

we could actually use the same zeros and ones to represent colors.

And so there is this sort of hierarchy, this layering

of one concept on another, so that we can

start thinking about problems at this level,

and just take for granted that someone else

before us figured out how to actually map it to physical things

Well turns out abstraction can be both useful and not so useful.

And I thought we could explore this by way of just a couple of problems.

The first of these requires that we take advantage of the white pieces of paper

that hopefully you're holding in your hand.

If you don't, any piece of notepaper suffices.

Or just raise your hand, or one of us can run over with a piece of paper.

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CS50 2018 - エールで読む1 - スクラッチ (CS50 2018 - Lecture 1 at Yale - Scratch)

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