Compilare: user.cpp: In function ‘int main()’: user.cpp:83:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<v.size();i++){ ^ user.cpp:56:20: warning: unused variable ‘j’ [-Wunused-variable] register int i,j,x,y,nr=0; ^ user.cpp: In function ‘bool conex()’: user.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type] } ^