heloo

[Gamer2015]

you have to include the library algorithm because std::unique is in there.
Add this to the other #include - directives
#include <algorithm>

[mariuss]

I put them and still does not work

[mariuss]

I am doing something wrong
please help!!

[Gamer2015]

Oh no, I'm sorry, std::unique only works on sorted vectors and does something completely different, you want non-unique items but std::unique gives you all items exactly once...

seems like you have to invent your own algorithm for removing non-unique items

[mariuss]

and how they do it?
I need this
if I have in file1.txt
Line A
Line C
Line D

in the second file2.txt
Line B
Line C
Line D
Line E

the output file to appear :
Line C
Line D
in output file I must heve only the duble words D and C

[Gamer2015]

try it yourself, for loops are a good start

[mariuss]

There is nothing better in my program
can you help me?

[Gamer2015]

what do you mean?

[mariuss]

There is nothing good in my program?

[Gamer2015]

sure, your program works fine!

You just have to find a way to remove all unique elements.

[mariuss]

how I do this thing
I am a beginner and I need this project
help pls

[Gamer2015]

I am a beginner and I need this project

The only way to get better is by doing stuff yourself...

for(int i = 0; i < fileLines.size(); ++i) { /* do something with each element */ }

[mariuss]

I put for(int i = 0; i < fileLines.size(); ++i) in my main program
I promise you I study what you show me on this program

[Gamer2015]

That won't do anything yet...

You have the chance to study by inventing your algorithm, that's far more efficient! ;)

[mariuss]

anybody help me