Compilare: user.cpp: In function ‘int ADD(int, int)’: user.cpp:17:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[i].size(); j++) ~^~~~~~~~~~~~ user.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[i].size(); j++) ~^~~~~~~~~~~~