PubMatic Full Stack Web Developer interview questions

in first round (on paper) can we overload the main method ? what is classloader? java is pass by value / pass by refrence? 1 question about hadoop.. mapreduce .. multithreading.. ...most of core java question *sudocode/code >find higth of binarytree >find highest sum of two number from array >calculate the total donation of temple(scenario based) >find loop in linkedlist * second round(Ds & algorithm) discuss the first round paper >is the binary search tree? >x^y calculation? > decimal to binary and find number of 1s in it >find a node from loop start and the join it with another linked list.