to compile 
    g++ GE2.cpp ***.cpp (replace *** with algorithm name)

    ex - compiling mergesort
        g++ GE2.cpp mergesort.cpp

to run
    mergesort and quicksort
    ./a.out ***.txt k
        replace *** with file name of input
        k is the size partition when insertion sort will be done
    
    redixsort and timsort
    ./a.out ***.txt
        replace *** with file name of input