Odd. Why is the C version so much slower than the C++ version? The only thing I notice that's odd is the unnecessary Room/Tile structs + memcpy in MakeLevs, but that can't be responsible for that level of difference.

Also there is a small bug in the C version. When it goes to print out the level, it only compares the first 100, so it'll print a different level from the C++ version with a seed of say, 20.