Compilare: user.cpp: In function ‘int main()’: user.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<s.size(); ++i){ ^ user.cpp:19:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] viz[s[i]]==1; ^ user.cpp:19:12: warning: value computed is not used [-Wunused-value] viz[s[i]]==1; ^ user.cpp:20:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (a[s[i]]==0) ^ user.cpp:22:10: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[s[i]]=m[i]; ^ user.cpp:27:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (a[s[i]]!=m[i]) i=s.size()+5, k=0; ^ user.cpp:30:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (f==s.size()) cout<<"DA"; else ^ user.cpp:37:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (viz[c[i]]==0) u=0; ^