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# pivot watch

1. is this correct? question 1 ? regarding the pivot quick sort
Attached Images
2. Scan0140.pdf (288.3 KB, 67 views)
3. this is the question http://www.edexcel.com/migrationdocu...e_20090113.pdf
question 1)a)
4. Looks all good to me!
Happy new year
5. (Original post by AndrewD95)
Looks all good to me!
Happy new year
so does it matter for the last one which pivot you chose ?

in matching how can you see which one is unmatched in improve matching
6. It should have gone MR on the second to last one and then the R would have been the pivot and there would have been no change
7. and i dont understand what you mean in the matching question
8. (Original post by AndrewD95)
and i dont understand what you mean in the matching question
http://www.edexcel.com/migrationdocu...e_20110119.pdf

question 4)b) why is D unmatched and not M
9. thats just an example of an initial matching that they have given
10. (Original post by AndrewD95)
thats just an example of an initial matching that they have given
But in mark scheme it only stated D unmatched or can any be an unmatched so for example can i have M unmatched and not D
11. by the look of it they have chosen to start at J for the improved matching, leaving D unmatched. and you cannot make a complete matching until part C
12. (Original post by AndrewD95)
by the look of it they have chosen to start at J for the improved matching, leaving D unmatched. and you cannot make a complete matching until part C
yes but like can i have M unmatched or does it have to be D? thats what i dont get
13. How did you get M unmatched?
14. (Original post by AndrewD95)
How did you get M unmatched?
Ok you cant i know its wrong as it was not in mark scheme but from the matching not the first drawing the second one how do we know straight away that D is unmatched
15. as far as i can see you could have either D or J as unmatched
16. (Original post by otrivine)
is this correct? question 1 ? regarding the pivot quick sort
how many times have you sat this exam?!
17. (Original post by AndrewD95)
as far as i can see you could have either D or J as unmatched
Ok but how can you tell?
18. (Original post by JOR2010)
how many times have you sat this exam?!
once
19. (Original post by otrivine)
is this correct? question 1 ? regarding the pivot quick sort
PIVOTTTT..

..

How long does it take to get a couch up stairs.. *sighh*
20. start with the unmatched ones and get an improved matching from that. it will leave a pair unmatched

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