Compilare: user.cpp: In function ‘void bellmanford()’: user.cpp:46:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[u].size(); ++ k) { ^ user.cpp: In function ‘void dijkstra()’: user.cpp:73:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[from].size(); ++ k) { ^ user.cpp: In function ‘int main()’: user.cpp:121:34: warning: narrowing conversion of ‘g[y].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[x].push_back({y, g[y].size(), z, c, 0}); ^ user.cpp:122:36: warning: narrowing conversion of ‘(g[x].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() + 4294967295u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[y].push_back({x, g[x].size() - 1, -z, 0, 0}); ^