This is the mail archive of the cygwin@sourceware.cygnus.com mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]

No Subject


Ugo Matrangolo <matra@dedalus.com> writes:
> 
> This program works fine under FreeBSD. 
> 
> Can anyone tell me if it is a bug or my fault ?  

Your fault. Sorry.

A hint:

Think of what's happenning:
    
    vector< vector<int> > mymatrix(n);

Here mymatrix is a vector of n elements, where each element is another
vector; the rub is that each element vector is uninitialized!

    for (int i = 0;i < n;i++)
       for (int j = 0;j < n;j++)
          mymatrix[i][j] = 0; 	// <<< matrix[i] is uninitialized!

take a look at vector<T>::reserve which you can use here. 

or, you can simply do something like the following:
  
    for (int i = 0;i < n;i++)
       mymatrix[i].insert (mymatrix[i].begin(), n, 0);

or, you could use vector<T>::push_back().

or, ....

Regards,
Mumit

-
For help on using this list (especially unsubscribing), send a message to
"gnu-win32-request@cygnus.com" with one line of text: "help".


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]