Compilare: user.cpp: In function ‘bool exp()’: user.cpp:12:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] }else i+=2,rs = V[S[i]]; ^ user.cpp: In function ‘int main()’: user.cpp:38:6: warning: array subscript has type ‘char’ [-Wchar-subscripts] V[c] = !V[c]; ^ user.cpp:38:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] V[c] = !V[c]; ^