Compilare: user.cpp: In function ‘void matrice_adiacenta()’: user.cpp:21:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size()-1; i++) ^ user.cpp:22:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<s.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++) ^ user.cpp:54:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0; it<G[x].size(); it++) ^