            ____________________________
	       /                            \
	N + (N-1) + (N-2) + (N-3) ... + 3 + 2 + 1
	\_______________________________________/
	
	
	= N(N+1)/2
	= N^2 / 2
	
	
selection

N=      10, time=    0
N=      20, time=    0
N=      40, time=    0
N=      80, time=    1
N=     160, time=    1
N=     320, time=    9
N=     640, time=   17
N=    1280, time=  105
N=    2560, time=  449
N=    5120, time= 1007
N=   10240, time= 4652
N=   20480, time=17843


insertion
N=      10, time=    0
N=      20, time=    0
N=      40, time=    0
N=      80, time=    0
N=     160, time=    1
N=     320, time=    5
N=     640, time=   32
N=    1280, time=   63
N=    2560, time=  288
N=    5120, time=  819
N=   10240, time= 3615
N=   20480, time=16409
N=   40960, time=58826

merge
N=      10, time=    0
N=      20, time=    0
N=      40, time=    0
N=      80, time=    0
N=     160, time=    1
N=     320, time=    7
N=     640, time=    5
N=    1280, time=    6
N=    2560, time=   27
N=    5120, time=   29
N=   10240, time=   63
N=   20480, time=  159
N=   40960, time=  322
N=   81920, time=  620
N=  163840, time= 1299
N=  327680, time= 2790
N=  655360, time= 5634
N= 1310720, time=11591
N= 2621440, time=22454
