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ReplyI want to find all possible combination of letters and dot â.â Condition is that suppose if we have 2 letter "ab" then using "." in between them we can make combination as âa.bâ Same for 3 letters "abc" we can make possible combination "a.bc", "ab.c" and "a.b.c" Same for 4 letter "abcd" we can make "a.bcd", "ab.cd", "abc.d", "a.b.cd", "a.b.c.d", "ab.cd", "ab.c.d", "a.bc.d" and "abc.d". For the above problem I have tried to make a c++ program to find all possible combinations for any number of letters but I haven't been able to find a good solution.
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ReplyHi guys, do not read this article because it is not the updated one, it is still the old one. I'll report this to Codeguru webmaster.
Brad has resolved it for me. Thanks, Brad!
ReplyHi, I have used your combination for char, but when I tried changing it to integers, it did not work. Can you please show me how to make it work for numbers. Thanks. Ed.
ReplyOriginally posted by: Jimmy
Hi, using your algorithms, I've generate combinations for the integers 1..20 : this gives over 1 million combos : thanks for that.
My program needs to filter out some of these combinations eg. don't allow combinations which contain {2,3). No problem there but I want to increase the efficiency of my program both for memory usage and speed. I'm thinking of representing each combination as a bitset and using shift operations for comparisons and filtering out various combinations.
Is there come way I can use your algoritm to come up with all the combinations of 1's and 0's for say 20 bits eg
00000000000000000001 : 1
00000000000000000011 : 1,2
00000000000000000010 : 2
00000000000000000111 : 1,2,3
00000000000000000110 : 2,3
00000000000000000101 : 1,3
....
Originally posted by: jared
what about reverse combos, ie BA, CB, etc.
what about redundancies, ie AA, BB, CC, etc, in the case of unlimited pool.
what about different variants on the letter, ie upper case, lower case, italic, bold, etc.
Is there a general formula for this?
Originally posted by: Paul McKenzie
I've posted another method that overcomes
a) the problems of next_permutation returning false
b) is non-recursive
c) works for any type of data (since it is a template).
In short, it uses a totally different approach in finding combinations using next_permutation.
It is available here:
http://www.codeguru.com/forum/attachment.php?s=&postid=721348
The discussion is here:
http://www.codeguru.com/forum/showthread.php?s=&threadid=241675
Probably I will post an article on it in the near future.
Paul McKenzie
Reply