Compilare: user.cpp: In function ‘std::ostream& operator<<(std::ostream&, const Container&)’: user.cpp:35:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < obj.N; i++) { ^ user.cpp: In member function ‘void Container::_quicksort(uint, uint)’: user.cpp:59:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( vec[ i ] < p ) i++; ^ user.cpp:61:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( vec[ j ] > p ) j--; ^ user.cpp:66:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lo < j) _quicksort(lo, j); ^ user.cpp:68:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi) _quicksort(i, hi); ^