Compilare: main.cpp: In function 'int eval3()': main.cpp:90:19: warning: array subscript has type 'char' [-Wchar-subscripts] r = v[e[p]]; ^ main.cpp: In function 'int main()': main.cpp:104:19: warning: array subscript has type 'char' [-Wchar-subscripts] v[x[i - 1]] = !v[x[i - 1]]; ^ main.cpp:104:34: warning: array subscript has type 'char' [-Wchar-subscripts] v[x[i - 1]] = !v[x[i - 1]]; ^ main.cpp: In function 'int eval3()': main.cpp:94:12: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized] return r; ^