Compilare: user.cpp: In function ‘int main()’: user.cpp:20:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < dim && stiva.size() + dim - i > N && stiva.size() < N) ^ user.cpp:20:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < dim && stiva.size() + dim - i > N && stiva.size() < N) ^ user.cpp:25:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(stiva.size() + dim - j > N && j < dim) ^