Compilare: user.cpp: In function ‘bool rec(int)’: user.cpp:26:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (litmic(s[i])) {k++;el[k]=(neg+v[s[i]])%2;neg=0;} ^ user.cpp:48:17: warning: statement has no effect [-Wunused-value] if (k==1) el[1]; ^ user.cpp: In function ‘int main()’: user.cpp:69:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[chr]=(1+v[chr])%2; ^ user.cpp:69:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] v[chr]=(1+v[chr])%2; ^