Compilare: user.cpp: In member function ‘void MaxFlow::gap(int)’: user.cpp:58:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < r.size(); i++) { ^ user.cpp: In member function ‘int MaxFlow::max_flow(graph&, int, int)’: user.cpp:98:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < g.size(); i++) { ^