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The 'Trick' To Algorithmic Coding Interview Questions (dice.com)
Nerval's Lobster writes: Ah, the famous "Google-style" algorithmic coding interview. If you've never had one of these interviews before, the idea is to see if you can write code that's not only correct, but efficient, too. You can expect to spend lots of time diagramming data structures and talking about big O notation. Popular hits include "reverse a linked list in place," "balance a binary search tree," and "find the missing number in an array." Like it or not, a "Google-style" coding interview may stand between you and your next job, so it's in your interest to figure out how to deal with it. Parker Phinney, founder of Interview Cake, uses a Dice column to break down a variety of example problems and then solve them. But it's not just about mastering the most common kinds of problems by rote memorization; it's also about recognizing the patterns that underlie those problems.
I picked a random problem off the list called 4-sum, read it, it obviously had a solution in O (n^2 log n), and the bloody website claims O (n^3). They should be ashamed.