Compilare: user.cpp: In function ‘void fre(long long int)’: user.cpp:37:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/4)/2+fc[ch]*(dr/4)/2; ^ user.cpp:37:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/4)/2+fc[ch]*(dr/4)/2; ^ user.cpp:42:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/2)/2+fc[ch]*(dr/2)/2; ^ user.cpp:42:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/2)/2+fc[ch]*(dr/2)/2; ^ user.cpp:47:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/4*3)/2+fc[ch]*(dr/4*3)/2; ^ user.cpp:47:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] rz=rz+f[ch]*(dr/4*3)/2+fc[ch]*(dr/4*3)/2; ^ user.cpp: In function ‘int main()’: user.cpp:62:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]]++; ^ user.cpp:63:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] s1[i]=f[s[i]]; ^