Link to my code: https://codeforces.net/contest/1388/submission/88538912

I think I've pretty much explored all avenues for optimization (besides switching to C++). The number of operations is around $$$2\cdot10^8$$$ in the absolute worst case, so I don't have any idea what could be slowing down my code. Is there anyone who's more knowledgeable in me at Java that can identify any further optimizations or possible bottlenecks in my code?