Compilare: user.cpp: In function ‘void addedge(int, int, int, int)’: user.cpp:28:32: warning: narrowing conversion of ‘g[b].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[a].push_back({b, g[b].size(), cost, cap, 0}); ^ user.cpp:29:34: warning: narrowing conversion of ‘(g[a].std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >() + 4294967295u)’ from ‘std::vector<Edge>::size_type {aka unsigned int}’ to ‘int’ inside { } [-Wnarrowing] g[b].push_back({a, g[a].size() - 1, -cost, 0, 0}); ^ user.cpp: In function ‘void bellmanford()’: user.cpp:42:37: 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:95:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i++) { ^ user.cpp: In function ‘void fmcm(int&, int&)’: user.cpp:117:7: warning: unused variable ‘t’ [-Wunused-variable] int t = 0; ^