Some tips about strange compile errors:
[list][*]Weird stuff about iterators, templates, etc: this means one of your variables is using the name of a function
(like min, count, fill) These functions are included by default in <iostream> in g++. (not in VC++)
[*]Usually the name of the variable will be mentioned in the error.
[*]math.h library errors (pow, sqrt) - For some reason g++ doesn't like it when you take the pow or sqrt with mixed types. (float, double or int, float for example)
[*]To fix this, make everything a double. (e.g. use pow(double(x), 2.0) instead of pow(x,2) if you're getting this error.)
[*]Try to avoid this: for (int i=0; i<N; i++) { code }. In g++, i goes out of scope after the for loop ends, whereas in VC++ it persists. This usually gives errors like "obsolete binding...".[/list]Pay attention to the line numbers! especially "instantiated from".
If I've missed anything, please add to this post.