Firstly, I finished a two hours online coding challenge with 16 problems. Then, there are two phone interviews, each one hour. The first one mainly is about my resume, he asked a lot on my c++ projects, he also asked one coding problem.

The second person asked one coding problem and some questions on data structures, especially hashmap and treemap.

1. The function void removeChar(char* message, char * filter) is used to remove every character in the message in place that appears in the filter.

2. Implement the dot product.