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I was asked that exact same question over a phone interview.

One of the most interesting questions given to me was, write an algorithm such that given four colors and a rectangle, fill the rectangle with a gradient using a color in each corner. After the fact it wasn't very hard, but having never thought about such a problem, it was pretty difficult white boarding it out. It was a pretty good question because I think that most people aren't thinking or preparing for such a problem, instead opting to study arrays, linked lists, trees, sorting algorithms and running time. You really get to see how a person thinks with it.

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