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Posted on 2003-11-07
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Last Modified: 2010-04-05
I have up to 4000 items to sort.  These items need to be sorted on 2 fields - first on a numeric field and then on a string field.  For example:

1,widget; 3,zebra; 1,apple should be sorted as 1,apple; 1,widget; 3,zebra.

I don't have a particular data structure in mind yet.  Could anyone tell me what will be the most efficient way and structure for this kind of sort.  There are a number of options available but I would like to minimize memory usage and maximize speed.  

Thanks for any guidance.
alexia
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Question by:alexiat
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2 Comments
 
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Accepted Solution

by:
monir earned 500 total points
ID: 9703388
The fastest sort algorithm is Quick Sort, in Delphi we have TList, so declare a class for your Item,

TItem = clase

  Int: integer;
  str: string;

 constructor create( i: int; s: string);
end;

 then store the items in TList

MyList: TList;

for i:=1 to 4000
  MyList.Add ( TItem.Create (v1, V2));

finally use sort method inside TList.

MyList.Sort (@sortItem);

function sortItem  ( Item1,Item2:Pointer) :Integer;
begin
  result:=TItem (Item1).int - TItem (Item2).Int);
  if  result=0 then // Same Value
     result:=CompareText(TItem (Item1).Str,TItem (Item2).str) ;
end;


If you need more description I will send you a tiny sample of code.

Monir
0
 

Author Comment

by:alexiat
ID: 9703608
Thanks.  Just wasn't sure which sort and data structure would be the most efficient.
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