Compilare: user.cpp: In function ‘int Cup(int)’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^