Union Solution - Intro to Computer ScienceYouTube↗  IA↗(long shot)
Education  1.7K views 12 likes 0 dislikes   29 May 2012
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so let's think about how to define Union
[Evans] Let's think about how to define union.
we need to make a procedure that takes two lists as and sin puts we'll call the
We need to make a procedure that takes 2 lists as its inputs.
lists P and Q so the define Union we want to modify P by adding elements from
We'll call the lists p and q. To define union we want to modify p by adding elements from q.
Q we should remember that append
We should remember that append operation does that.
operation does that it adds a new
It adds a new element to a list.
element to a list so we're going to use a pen to add elements from Q to P so to
So we're going to use append to add elements from q to p.
define Union we need to go through all
To define union we need to go through all the elements in q.
the elements in Q check for each element whether it already exists in P if it
Check for each element whether it already exists in p.
does we do nothing if it doesn't then we
If it does, we do nothing. If it doesn't, then we add it to p.
add it to P so we'll use a for loop and
So we'll use a for-loop.
we need to make sure that we loop
We need to make sure that we loop through the elements of q.
through the elements of Q those are the ones that we want to add to P for each
Those are the ones that we want to add to p.
element we need to test whether or not
For each element we need to test whether or not it's already in p,
it's already in P so we check to make sure the element is not already in P if
so we check to make sure the element is not already in p.
this is true that means E is not in P
If this is true, that means e is not in p,
and we want to add it to add either P we
and we want to add it.
use append
To add e to p, we use append.
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