Compilare: main.cpp: In member function 'void Flow_Graph::AddEdge(int, int, int)': main.cpp:62:38: warning: narrowing conversion of '(&((Flow_Graph*)this)->Flow_Graph::adj.std::vector<_Tp, _Alloc>::operator[]<std::vector<Flow_Graph::Edge>, std::allocator<std::vector<Flow_Graph::Edge> > >(((std::vector<std::vector<Flow_Graph::Edge> >::size_type)to)))->std::vector<_Tp, _Alloc>::size<Flow_Graph::Edge, std::allocator<Flow_Graph::Edge> >()' from 'std::vector<Flow_Graph::Edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] Edge x = {to, 0, cap, adj[to].size()}; ~~~~~~~~~~~~^~ main.cpp:63:40: warning: narrowing conversion of '(&((Flow_Graph*)this)->Flow_Graph::adj.std::vector<_Tp, _Alloc>::operator[]<std::vector<Flow_Graph::Edge>, std::allocator<std::vector<Flow_Graph::Edge> > >(((std::vector<std::vector<Flow_Graph::Edge> >::size_type)from)))->std::vector<_Tp, _Alloc>::size<Flow_Graph::Edge, std::allocator<Flow_Graph::Edge> >()' from 'std::vector<Flow_Graph::Edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] Edge y = {from, 0, 0, adj[from].size()}; ~~~~~~~~~~~~~~^~ main.cpp: In member function 'bool Flow_Graph::BFS()': main.cpp:80:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it = 0; it < adj[from].size(); it++) { ~~~^~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int Flow_Graph::DFS(int, int)': main.cpp:96:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int &it = rem[from]; it < adj[from].size(); it++) { ~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:184:29: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", edges.size()); ^ main.cpp:181:6: warning: unused variable 'mflow' [-Wunused-variable] int mflow = G.MaxFlow(); ^~~~~ main.cpp:159:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harta.in", "r", stdin); ^ main.cpp:160:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("harta.out", "w", stdout); ^ main.cpp:163:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:170:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^