Compilare: user.cpp: In function ‘bool BF(const int&, const int&)’: user.cpp:39:35: 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()’: user.cpp:57:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[destination].size(); i++) { ^