Compilare: main.cpp: In function 'void Flow::add_edge(int, int, int)': main.cpp:20:47: warning: narrowing conversion of 'Flow::edges.std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()' from 'std::vector<Edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] edges.push_back({ to, flow, edges.size() }); ~~~~~~~~~~^~ main.cpp:22:46: warning: narrowing conversion of 'Flow::edges.std::vector<_Tp, _Alloc>::size<Edge, std::allocator<Edge> >()' from 'std::vector<Edge>::size_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] edges.push_back({ from, 0, edges.size() }); ~~~~~~~~~~^~ main.cpp: In function 'bool Flow::bfs()': main.cpp:30:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < q.size(); i++) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:84:31: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ main.cpp:89:41: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d", &a, &b, &c); ^