Compilare: user.cpp: In member function ‘void Algorithm::Enqueue(int)’: user.cpp:24:64: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x[nod] > 0 && !active[nod] && label[nod] < r.size () - 1) { ^ user.cpp: In member function ‘void Algorithm::Gap(int)’: user.cpp:63:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < r.size(); i++) { ^ user.cpp: In member function ‘int Algorithm::MaxFlow(Algorithm::Graph&, int, int)’: user.cpp:99:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < g.size (); i++) { ^