I’m getting an error that says merging 2 vertices causes error! #

If you’re receiving this output on Gradescope, it’s originating from the last test which checks for correctness of all your methods after a union is performed. Specifically, after unioning the two vertices, the output of one of your methods find, sizeOf, connected, or parent is returning the incorrect output. You should write a local test that checks that all your methods return the expected values each time that you connect two vertices together. In some cases, double check that you’re handling invalid inputs correctly in your methods.

I’m running into StackOverFlowError or seeing that my assessment timed out #

on one of the tests.

If you’re receiving a StackOverFlowError, it might imply that there is an infinite recursion happening somewhere in your implementation. Double check that you’re accounting for different cases correctly - for example, what should happen if you try to union two vertices within the same set?