Compilare: user.cpp: In function ‘void insert_hash(int)’: user.cpp:13:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[listt].size(); i++) ^ user.cpp: In function ‘int find_hash(int)’: user.cpp:28:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[listt].size(); i++) ^ user.cpp: In function ‘void remove_hash(int)’: user.cpp:40:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=G[listt].size(); i++) ^ user.cpp: In function ‘void dfs_hash(int)’: user.cpp:52:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<L[nod].size(); i++) ^