Compilare: user.cpp: In function ‘void euler(int)’: user.cpp:16:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<v[x].size();i++) ^ user.cpp:15:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,y,vecin; ^ user.cpp:15:13: warning: unused variable ‘y’ [-Wunused-variable] int i,j,y,vecin; ^ user.cpp:15:15: warning: unused variable ‘vecin’ [-Wunused-variable] int i,j,y,vecin; ^ user.cpp: In function ‘int main()’: user.cpp:37:30: warning: narrowing conversion of ‘v[y].std::vector<_Tp, _Alloc>::size<nod, std::allocator<nod> >()’ from ‘std::vector<nod>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] aux={y,v[y].size(),0}; ^ user.cpp:39:31: warning: narrowing conversion of ‘(v[x].std::vector<_Tp, _Alloc>::size<nod, std::allocator<nod> >() + 4294967295u)’ from ‘std::vector<nod>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] aux={x,v[x].size()-1,0}; ^ user.cpp:44:30: warning: narrowing conversion of ‘v[x].std::vector<_Tp, _Alloc>::size<nod, std::allocator<nod> >()’ from ‘std::vector<nod>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] aux={x,v[x].size(),0}; ^