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Randomizing problem

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I'm a beginner in C programming, I study it for 3 months now. Before that I was using Visual Basic 6 for about five years, so I know the basics. Anyway, I'm creating a little sokoban clone (my first game in C :D ) using SDL (just the basic library), and I've bumped into a problem: I need a fast-changing seed for srand() function. I need to get (maximum) 400 random numbers, as fast as possible, and the srand(time(0)) is just to slow, and I get all 400 numbers the same. So, I need some function that returns a proper number (that I can feed to srand) and does it fast. I tried google-ing for it, but nothing useful came up. Any ideas? Thanks.

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