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

Just want to check if I did this NMR analysis right

Answer 4

Which statement best explains why Samuel Pepys's diary became popular?

Answer 5

What is the value of x to the nearest tenth?
9.6
12.8
8.0
20.8

Answer 6

3. A recipe calls for 1.5 cups of flour, 0.75 cup of white sugar, and 0.5 cup of brown sugar.

Answer 7

If the length of the major axis of an ellipse is 28 units and the foci are located 3.

Answer 8

2. The table shows several animals that live in or below a tree. The table also shows the elevation of their dwellings, relative to ground level.

Answer 9

math help please

Answer 10

Is this right

Answer 11

"This gang traditionally hits the three locations during each crime spree using the same pattern.

Answer 12

I need help with math please!!!

Answer 13

Juan has 20 books to sell. He sells the books for $15 each.

The amount of money Juan makes from selling x books is represented by a function.

Answer 14

Monique has 3 eggs and needs to buy more. A store has 6 dozens of eggs. Monique needs to buy at least 2 dozen.

Answer 15

What is the equation of the line shown in this graph?

write the equation of the line in slope-intercept form.

Answer 16

Which scale factors produce an expansion under a dilation of the original image?

Select each correct answer.

Answer 17

20ax^2+25ax+15a=5a( )

complete the statement

Answer 18

9a^2x^2+9a^2x+9a^2

Answer 19

2x^2a+2xa^2

Answer 20

@Elsa213 can yew show kai de wae.... of latex?

Answer 21

For the graph of the function, identify the axis of symmetry, vertex and the formula for the function.

Answer 22

listen to me