Compilare: main.cpp: In function 'bool var()': main.cpp:65:23: warning: array subscript has type 'char' [-Wchar-subscripts] r = v[x[i]]; ^ main.cpp: In function 'int main()': main.cpp:185:14: warning: array subscript has type 'char' [-Wchar-subscripts] v[sch] = !v[sch]; ^ main.cpp:185:24: warning: array subscript has type 'char' [-Wchar-subscripts] v[sch] = !v[sch]; ^