Compilare: user.cpp: In function ‘int main()’: user.cpp:61:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<=sol.size();i++) ^ user.cpp:25:11: warning: unused variable ‘x’ [-Wunused-variable] int i,x,y,z,u,v,h1,h2; ^ user.cpp:25:13: warning: unused variable ‘y’ [-Wunused-variable] int i,x,y,z,u,v,h1,h2; ^ user.cpp:25:15: warning: unused variable ‘z’ [-Wunused-variable] int i,x,y,z,u,v,h1,h2; ^