How to split a vector into n “almost equal” parts

Question

I have a problem that I would like to merge a large number of images using ImageMagick\'s convert.exe, but under Windows I have a 8192 byte long command line limit.

Answer 1

You don't have to create new sub-vectors, use something like following:

size_t ProcessSubVec(const vector& images, size_t begin, size_t end)
{
    // your processing logic
}

void SplitVec(const vector& images, int cnt)
{
    size_t SubVecLen = images.size() / cnt,
           LeftOvers = images.size() % cnt,
           i = 0;

    // Split into "cnt" partitions
    while(i < images.size())
        i += ProcessSubVec(images, i, i + SubVecLen + (LeftOvers-- == 0 ? 0 : 1));
}

Hope this helps.