Compilare: user.cpp: In function ‘int add_to_apm(int)’: user.cpp:36:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<VECT[x].size();i++){ ~^~~~~~~~~~~~~~~ user.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:95:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<VECT[z].size();j++){ ~^~~~~~~~~~~~~~~