1 round is phone interview, asking your past experience, basics in C/C++, the difference between C++ and Java, and how to identify a heavier ball in 12 ball in 3 times. 2nd round is a on-site interview. you will meet with 3~4 interviewers during the day, first one asked me how to calculate the sum of a binary tree at certain level, second asked me to write how to check if a string is a palindrome. Third one is to about the Tic-Tak-Toe game, write a function to check if someone has won at the current board situation.