Compilare: user.cpp: In function ‘int main()’: user.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<str.size();i++) if(isalpha(str[i])) ex[str[i]]=1; ^ user.cpp:21:60: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=0;i<str.size();i++) if(isalpha(str[i])) ex[str[i]]=1; ^ user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<str.size();i++) ^ user.cpp:29:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] ap[str[i]]+=(inainte(i)*sop); ^ user.cpp:18:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b,c,sop=0; ^ user.cpp:18:13: warning: unused variable ‘a’ [-Wunused-variable] int i,j,a,b,c,sop=0; ^ user.cpp:18:15: warning: unused variable ‘b’ [-Wunused-variable] int i,j,a,b,c,sop=0; ^ user.cpp:18:17: warning: unused variable ‘c’ [-Wunused-variable] int i,j,a,b,c,sop=0; ^