Compilare: main.cpp: In member function 'void Dinic::add_edge(int, int, int)': main.cpp:40:42: warning: narrowing conversion of '(&((Dinic*)this)->Dinic::gr.std::vector<std::vector<Edge> >::operator[](((std::vector<std::vector<Edge> >::size_type)y)))->std::vector<Edge>::size()' from 'std::vector<Edge>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 40 | gr[x].pb ({y, 0, cap, gr[y].size ()}); | ~~~~~~~~~~~^~ main.cpp:41:43: warning: narrowing conversion of '((&((Dinic*)this)->Dinic::gr.std::vector<std::vector<Edge> >::operator[](((std::vector<std::vector<Edge> >::size_type)x)))->std::vector<Edge>::size() - 1)' from 'std::vector<Edge>::size_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 41 | gr[y].pb ({x, 0, 0, gr[x].size () - 1}); | ~~~~~~~~~~~~~~^~~ main.cpp: In member function 'int Dinic::dfs(int, int, int)': main.cpp:64:28: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<Edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | while (start[node] < gr[node].size ()) { main.cpp: In member function 'int Dinic::maxflow()': main.cpp:83:25: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 83 | while (flow = dfs (source, sink, INF)) | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:101:9: warning: unused variable 'i' [-Wunused-variable] 101 | int i,j; | ^ main.cpp:101:11: warning: unused variable 'j' [-Wunused-variable] 101 | int i,j; | ^