Compilare: user.cpp: In function ‘void find_number_of_exterior_circles_per_line(int)’: user.cpp:74:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<work_vector.size();j++) ^ user.cpp: In function ‘void sort_line_circles(int)’: user.cpp:97:59: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<lines_with_circles[current_line].size()-1;i++) ^ user.cpp:99:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1;j<lines_with_circles[current_line].size();j++) ^ user.cpp: In function ‘int find_ggt(int, int)’: user.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type] } ^