Compilare: user.cpp: In function ‘void calc_skip()’: user.cpp:30:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( ind < oz.size() - 1 && apar(i, oz[ind + 1]) ) ^ user.cpp:36:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( ind < vr.size() - 1 && apar(i, vr[ind + 1]) ) ^ user.cpp: In function ‘int main()’: user.cpp:99:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < oz.size() && j < vr.size() ) { ^ user.cpp:99:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( i < oz.size() && j < vr.size() ) { ^ user.cpp:93:9: warning: unused variable ‘gc’ [-Wunused-variable] int gc = __gcd(xx,yy); ^