generator0.cc -> to test insertion
generator1.cc -> to test insertion and find together
generator2.cc -> to test insertion and find a constant number n/2 times (to find MTF)
generator3.cc -> to test insertion and removal separately
generator4.cc -> to test increasing insertion and decreasing insertion separately
generator5.cc -> to test insertion and finding elements backwards
generator6.cc -> to test insertion and find separately
generator7.cc -> to test insertion, removal and find separately (I F R F)