Compilare: user.cpp: In function ‘int factor()’: user.cpp:107:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[sir2[j]]=!v[sir2[j]]; ^ user.cpp:107:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[sir2[j]]=!v[sir2[j]]; ^ user.cpp:108:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] rez=v[sir2[j]]; ^ user.cpp:110:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] else {rez=v[sir2[j]];} ^