Compilare: user.cpp: In function ‘void addedge(int, int)’: user.cpp:109:33: warning: narrowing conversion of ‘g[to].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge direct = {to, g[to].size(), 0}; ^ user.cpp:110:38: warning: narrowing conversion of ‘g[from].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge inverse = {from, g[from].size(), 0}; ^ user.cpp: In function ‘int main()’: user.cpp:165:42: warning: ‘position.Points::y’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << position.x << ' ' << position.y << ' ' << res - 1 << '\n'; ^ user.cpp:165:21: warning: ‘position.Points::x’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << position.x << ' ' << position.y << ' ' << res - 1 << '\n'; ^