Compilare: main.cpp: In function 'int euler(int)': main.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<x[akt].sz.size();++i) ~^~~~~~~~~~~~~~~~~ main.cpp:45:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:56:46: warning: narrowing conversion of 'x.std::vector<_Tp, _Alloc>::operator[]<cica1, std::allocator<cica1> >(((std::vector<cica1>::size_type)b)).cica1::sz.std::vector<_Tp, _Alloc>::size<cica, std::allocator<cica> >()' from 'std::vector<cica>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] x[a].sz.push_back({b,x[b].sz.size(),false}); ~~~~~~~~~~~~^~ main.cpp:57:48: warning: narrowing conversion of '(x.std::vector<_Tp, _Alloc>::operator[]<cica1, std::allocator<cica1> >(((std::vector<cica1>::size_type)a)).cica1::sz.std::vector<_Tp, _Alloc>::size<cica, std::allocator<cica> >() - 1ul)' from 'std::vector<cica>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] x[b].sz.push_back({a,x[a].sz.size()-1,false}); ~~~~~~~~~~~~~~^~ main.cpp:61:48: warning: narrowing conversion of '(x.std::vector<_Tp, _Alloc>::operator[]<cica1, std::allocator<cica1> >(((std::vector<cica1>::size_type)b)).cica1::sz.std::vector<_Tp, _Alloc>::size<cica, std::allocator<cica> >() + 1ul)' from 'std::vector<cica>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] x[a].sz.push_back({b,x[b].sz.size()+1,false}); ~~~~~~~~~~~~~~^~ main.cpp:62:48: warning: narrowing conversion of '(x.std::vector<_Tp, _Alloc>::operator[]<cica1, std::allocator<cica1> >(((std::vector<cica1>::size_type)a)).cica1::sz.std::vector<_Tp, _Alloc>::size<cica, std::allocator<cica> >() - 1ul)' from 'std::vector<cica>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] x[b].sz.push_back({a,x[a].sz.size()-1,false}); ~~~~~~~~~~~~~~^~