Compilare: user.cpp: In function ‘bool edge(int, int)’: user.cpp:30:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < comp_conexe[a].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:57:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<out[j].size(); ++i) ^ user.cpp:64:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < lv[i].size(); ++j) ^ user.cpp:77:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < new_edge.size(); ++i) ^