Compilare: user.cpp: In function ‘bool BF(const int&, const int&)’: user.cpp:48:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[nod].size(); i++) { ^ user.cpp: In function ‘int maxflow(const int&, const int&)’: user.cpp:61:9: warning: unused variable ‘flow’ [-Wunused-variable] int flow = 0, costflow = 0; ^