Compilare: user.cpp: In function ‘int main()’: user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<vo.size(); i++) ^ user.cpp:62:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<vv.size(); i++) ^ user.cpp:37:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, nrsol=0, nv, no, x, y; ^ user.cpp:37:15: warning: unused variable ‘nrsol’ [-Wunused-variable] int i, j, nrsol=0, nv, no, x, y; ^