[ExpiredLink]

Sorry, but understanding basic data structures is not difficult. This cannot be regarded as computer science. The examples he gives ("Recursive Towers of Hanoi", ...) attract the wrong people - those who are deeply depressed after their first year as 'real-world' programmer.

[benjamincburns]

I agree that understanding basic data structures shouldn't be difficult, but for a remarkable number of candidates it apparently is. Further, basic data structures is as much computer science as the "cell theory" is biology. It's a set of fundamental concepts that's quite core to computer science.