Compilare: user.cpp: In function ‘int main()’: user.cpp:17:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (fr[sir[i]]!=0) ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[i]]++; ^ user.cpp:26:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[i]]=1; ^ user.cpp:32:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(st<i && fr[sir[st]]>1) ^ user.cpp:34:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[st]]--; ^ user.cpp:37:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[st]]--; ^ user.cpp:40:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[i]]++; ^