Compilare: user.cpp: In function ‘void addedge(int, int, int)’: user.cpp:42:34: 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, 1, cost}; ^ user.cpp:43:38: 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, 0, -cost}; ^ user.cpp: In function ‘void bellmanford()’: user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++) { ^ user.cpp: In function ‘void dijkstra()’: user.cpp:92:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++){ ^