diff 10 0.0440564266828335
diff 100 0.0119661132855137
diff 1000 0.00776442278788769
diff 10000 0.000970000488995498
diff 100000 0.000723408105502054
diff 1000000 4.05356213388186e-05
diff 10000000 1.25584676765388e-05