Compilare: user.cpp: In function ‘int main()’: user.cpp:17:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[s[dr]]==0){ ^ user.cpp:20:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[s[dr]]++; ^ user.cpp:24:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(st<=dr&&fr[s[st]]!=1){ ^ user.cpp:25:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[s[st]]--; ^ user.cpp:28:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[s[st]]--; ^ user.cpp:30:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[s[dr]]++; ^ user.cpp:34:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[s[dr]]++; ^