Compilare: user.cpp: In function ‘int main()’: user.cpp:78:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol1.size();i++) g<<sol1.at(i)<<" "; ~^~~~~~~~~~~~ user.cpp:58:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b,ok; ^ user.cpp:58:17: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,a,b,ok; ^~