Question

I want to ask a question about course 2008 fall .The question is in Set 6 problem #3.
"Next, change the implementation of is_valid_word to take as an argument the representation you created above rather than the word_list itself. Remember that the choice of representation can have a big impact on performance. This modification will improve the complexity of is_valid_word from O(len(word_list)) to O(1)." I can't understand how can we fulfill this change and do not know why it changes the complexity to O(1).

Answer 1

The pdf's link is here: http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/assignments/pset6.pdf

Answer 2

how did you implement is_valid_word using word_list? why is its complexity O(len(word_list))?

how will you implement is_valid_word with the new representation of the wordlist?

http://wiki.python.org/moin/TimeComplexity

Answer 3

Luella has a pond in her yard. She wants to surround it with 330 feet of fencing. The fencing is sold by the yard. How many yards should she buy?

Answer 4

someone check my answers
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Answer 5

https://i.imgur.com/Wjmpc6D.png

Answer 6

Assessment items
Assessment started: undefined.
Item 1

Read the passage.

Dark Star

Giselle leaned against the mahogany bay horse, stroking the white diam

Answer 7

Okay I was gone for a minute BUT I'M BACK NOW

Answer 8

the scatter plot presents Ray's monthly electricity bills and amount of time ray

Answer 9

Which word shares a connotative meaning with the word cheap as it is used in this sentence?

Ashley thought her parents were being cheap when they bought ge

Answer 10

Which revision fixes the dangling modifier in the sentence?

Rowing through the rapids, the canoe began to fill with water.

Answer 11

dangling modifier

Answer 12

Misplaced Modifiers

Answer 13

For which literary work did Joseph Heller use his military experiences as a prima

Answer 14

Calc III Tutorial: Lagrange Multipliers

Answer 15

Can someone translate this for me?

Answer 16

Find the interest due on $1,090 at 8% for 5 years.

43.60
68.13
436.00
681.25

Answer 17

Now identify the simple subject and simple predicate.

The meeting began promptly at seven o'clock.

Answer 18

What can be inferred from these lines describing the pardoner in Chaucer's prolog

Answer 19

What is the rate of change of the linear relationship modeled in the table?

x y

Answer 20

Which of these best identifies the shift of mood in this sentence?

"If you were to sit more comfortably, you will not fall off.

Answer 21

Which scenario best matches the linear relationship expressed in the equation y = u221214x + 1,700?

Kent has $1,700 in his bank account and spends $14 each

Answer 22

The saying "Whoso is a man must be a nonconformist" is based on whose transcendentalist belief?
A.