The "talking and coding" point mentioned above is key. The interviewers want to hear your thought process and approach. Gayle McDowell (author of CtCI) has so

The "talking and coding" point mentioned above is key. The interviewers want to hear your thought process and approach. Gayle McDowell (author of CtCI) has some videos for purchase[0] that show mock interviews including whiteboard coding and she gives good feedback. Certainly worth the $40 if you are unfamiliar with this style of interviewing and going for a dream job. [0]: https://www.careercup.com/video https://www.careercup.com/video