Compilare: user.cpp: In function ‘int main()’: user.cpp:32:15: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin >> sir+1; ^ user.cpp:37:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++fr[sir[i]].fr; ^ user.cpp:38:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[sir[i]].lit=sir[i]; ^ user.cpp:55:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (er[sir[i]]) ^ user.cpp:66:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] fold=frcrt[sir[i]]; ^ user.cpp:89:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++frcrt[sir[i]]; ^