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After breaking Ethic out of prison,
Hedge flies them both towards a frontier settlement
in the shadow of the Bradbarrier, the great wall that encircles the nation.
All the settlers there will soon gather for the monthly feeding.
The people of the wall spend their days gathering up works of art and literature,
from all across the land.
On feeding day, the furnace-bots arrive, ravenous.
If they eat, the lights stay on, and the food gets delivered.
If they starve, the people do too.
Hedge's fuel supply runs out just as he and Ethic reach the outskirts of town,
and they come in for a crash landing.
Luckily, everyone is too busy preparing for the feeding to notice.
Today's feeding is where Ethic can find the leader
of an underground resistance movement.
This person knows the location of the first of three powerful artifacts.
The problem is, Hedge and Ethic don't know
the resistance leader's name or appearance.
But Hedge has gathered the following information:
The leader has green eyes.
If the leader has red hair, their name has at least one consecutive double letter.
If the leader wear glasses, their name has exactly 2 vowels.
Otherwise, their name has exactly 3 vowels.
There is exactly one person for whom these are all true.
As a fugitive,
Ethic can't sneak into the crowd without drawing attention to herself.
But she can give instructions to Hedge.
And one tool she has is what programmers call a conditional.
That's a statement of the form “If A, then B.”
Flowcharts are great illustrations of how those work.
This conditional translates to: if A is true, carry out instruction B.
There are also conditionals that account for different possibilities.
This says, “If A is true, perform instruction B.
Otherwise, carry out instruction C.”
So what instructions does she give Hedge so he can find the resistance leader?
Pause now to figure it out for yourself.
With a problem like this, it can help to simplify first.
What if Hedge just has to examine this one person?
What information does he need to collect about her?
He might ask, “Does she have green eyes?”
What other questions should Hedge ask to find the resistance leader,
and how can he track those answers?
Pause now to figure it out for yourself.
It may seem intuitive how you'd approach this problem as a human.
But Hedge isn't a human,
and so the challenge comes from needing to give him systematic instructions
that will work in any scenario.
Hedge needs to examine the settlers, one at a time,
until he discovers the right person.
In other words, like with the lock on the prison cell,
this is a loop that repeats the same instructions.
Only this time the loop will involve a series of questions
in the form of conditionals,
and will end as soon as Hedge finds his target.
But first, you'll want to organize your information.
Each person has a set of characteristics: Eye color, hair color, glasses, and name.
Does this person have green eyes?
If so, mark a check next to “eye color." If not, mark an X there.
If they have red hair, does their name contain a double letter?
If so, mark a check next to “hair color.”
If they don't have a double letter, mark an X next to “hair color.”
Anyone with red hair and no double letter can't be the resistance leader.
But notice that if they have blue hair,
Hedge will skip this question and go on to the next one.
For the last question, we can say,
“If they wear glasses, does their name have exactly 2 vowels?
If they don't have glasses, does their name have exactly 3 vowels?”
There will be people in the crowd with glasses and 1 vowel,
or no glasses and 2 vowels.
But they're not who we're looking for, so they'll get X's.
The resistance leader must be someone with either check marks
or blanks next to every question.
Blanks are ok, because if someone has blue hair,
the rule about red hair doesn't apply to them.
You could have Hedge ask every question about every person,
and then choose the person with only checks and blanks.
But there's a way to save yourself lots of time: as soon as Hedge marks an X,
have him move on to the next person.
You don't need to know the answer to every question;
just one X means they're not the target of your search.
Hedge buzzes through the crowd,
and within minutes finds Adila, the resistance leader,
and brings her back to Ethic.
Adila agrees to help them steal the first artifact— the node of power—
but under one condition:
that Ethic and Hedge jump-start the revolution
by reprogramming the furnace-bots that terrorize the town.
And right on cue, the robots descend.
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抵抗-像駭客一楊思考 (The Resistance | Think Like A Coder, Ep 2)

218 分類 收藏
ktyvr258 發佈於 2019 年 10 月 22 日
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