Compilare: user.cpp: In member function ‘bool BipartiteMatching::pairUp(int)’: user.cpp:24:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++i) ^ user.cpp:36:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[node].size(); ++i) ^ user.cpp: In function ‘Graph normalize(const Graph&)’: user.cpp:142:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[node].size(); ++i) ^