Dear adadad, try AlgoSeek.com they've got a really large database at a reasonable price.
Personally I can recommend working with them. They are professional , tend to answer quickly and often are willing to give a discount for special projects.
Dear Nishizono to get reliable data i can recommend using a professional data base. Try AlgoSeek.com, as you are a student, they'll probably give you a discount.
Dear algoisgame, as a student i can only recommend getting data from a professional company if you are relying on accuracy. Try AlgoSeek.com, they often provide a discount.