Now you solved my long time puzzle, Prof. W ---- that is why you are so good at Matlab... You are absolutely THE most competent person with Matlab that I ever know

According to Chinese custom, when someone praises you, you should say "where, where ( 哪里, 哪里)

". In this case, MATLAB programming happens to be one of the few things that I am proud of, I think the appropriate way to reply to your praise is: Thanks.

When I just came to Boston (10+ years ago), I met a guy who just came back from a ski trip (He happens to be one of the pioneers in Genetic programming field). This was not ordinary ski. He (and his friends) were not satisfied with ordinary ski, and hired a helicoptor to drop them off (with skii on) at the top of the mountain and go down from there (they do that every year). After I heard his description, I said: "You must be very good at ski". He looked at me in the eye and seriously said "I am THE best skier you will ever met in your life". From that moment, I realized that when you are proud of and confident about something, you can reply to a praise in a totally positive way. I guess I can say the same thing to you about my MATLAB programming.

, I will back up this claim with the following appendix.

Mathworks (MATLAB) hold a world wide MATLAB contest every year (or twice a year) for the past 10+ years. It is usually participated by several thousands of "best" MATLAB programmers in the world. When I worked in the MathWorks, we usually hold an internal contest (to test the problem, the scoring weight, etc.) before we put the problem out to the public contest. I have won the internal contest 3 years in a row, and my scores were usually better than the (later) public best scores. At that time, I could claim to be one of the top MATLAB programmers in the world. Now, my work does not rely on MATLAB (for many years), I cannot make that claim any more.

Now, back to the Project Euler. I agree this is a very interesting project, especially for people who love puzzles and knows how to program.