Compilare: user.cpp: In function ‘void add_hash(const string&, int)’: user.cpp:23:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<str.size(); ++i) { ^ user.cpp:24:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] f = f * B1 + s1[str[i]]; ^ user.cpp:25:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] s = s * B2 + s2[str[i]]; ^ user.cpp: In function ‘void Ave()’: user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ant+m<hsh[w.front()].size()) ^ user.cpp:42:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(hsh[j].size()<=ant+m || pat!=hsh[j][ant+m]) { ^