Effecient ways to merge blob whose position inside another blob using cvbloblib

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I basically want to remove all blobs whose positions insides another blobs.

I use the cvbloblib . I can get all the blobs; however, the library basically detect all blob even the position of those blob inside another.

I think of using iterative ways to detect if each blob inside another and merge them together.

for (int i = 0; i<res.GetNumBlobs(); i++){
       for (int j = 0; i<res.GetNumBlobs(); i++){
              //find if each blob is inside another
              if(condition blob(i) inside){
                       //delete
                       //break or return to another blob(i+1)
              }
       }
 }

However there are some issues :

1. iterative ways is not effecient way

2. You see in the image above, there are the cases where a blobs insides not 1 but could be another N blobs. so I tend to think about recursive function to do that.

Do you have any ways to merge those blobs inside ?