Can i speed up a algoritm when i use int.MaxValue and i had only 5,1 sec? but here i have always more than 12 sec?

Thanks for answer. I forgot about it.

My all test past but when i try atemp my solution i had 2 errors.

Test Failed
Expected string length 9 but was 12. Strings differ at index 5.
Expected: "[5, 2][4]"
But was: "[5, 2, 1][0]"
----------------^

This is a poorly written test. My solution is correct and there is a wrong string calculation on the test...