Compilare: main.cpp: In function 'int factor()': main.cpp:20:17: warning: array subscript has type 'char' [-Wchar-subscripts] else {r=b[*p];p+=2;} ^ main.cpp: In function 'int main()': main.cpp:58:12: warning: array subscript has type 'char' [-Wchar-subscripts] b[a]=!b[a]; ^ main.cpp:58:18: warning: array subscript has type 'char' [-Wchar-subscripts] b[a]=!b[a]; ^