Compilare: main.cpp: In member function 'int Coupling::pairup(int)': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h = 0 ; h < g[node].size() ; h++){ ~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'int Coupling::maxflow()': main.cpp:64:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < used.size() ; i++) ~~^~~~~~~~~~~~~