Compilare: user.cpp: In function ‘void euler()’: user.cpp:16:13: warning: unused variable ‘x’ [-Wunused-variable] int nod,x,y; ^ user.cpp:16:15: warning: unused variable ‘y’ [-Wunused-variable] int nod,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V.size();i=i+2) ^ user.cpp:74:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<ans.size();i=i+2) ^