Little Mistakes in file readings

Hey, there are some silly mistakes when reading files. In the case of simple_sw.cpp line 65 and 67 are the same comparison, I guess one should be done with lineQ, and on line 88 you are checking the length of Q against largestA (which I guess should be largestB) and updating largestB. The same happens for other examples.
It is a silly mistake but I thought you might want to correct it.