Compilare: user.cpp: In function ‘void addedge(int, int, int, int)’: user.cpp:42:32: 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] Edge direct = {y, g[y].size(), 0, cap, cost}; ^ user.cpp:43:32: warning: narrowing conversion of ‘g[x].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] Edge inverse = {x, g[x].size(), 0, 0, -cost}; ^ user.cpp: In function ‘void bellmanford()’: user.cpp:60:37: 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:90:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++) { ^