Compilare: main.cpp: In function 'void eval(int)': main.cpp:50:35: warning: array subscript has type 'char' [-Wchar-subscripts] 50 | if(config & (1 << val[x])) st.push(1); | ^ main.cpp: In function 'int main()': main.cpp:75:13: warning: array subscript has type 'char' [-Wchar-subscripts] 75 | val[ch] = v.size(); | ^~ main.cpp: In function 'int oper(char, int, int)': main.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] 29 | } | ^