Compilare: main.cpp: In function 'void solve()': main.cpp:43:42: warning: array subscript has type 'char' [-Wchar-subscripts] if (!s.empty() && type[str[i]] == type[str[s.top()]]){ ^ main.cpp:43:64: warning: array subscript has type 'char' [-Wchar-subscripts] if (!s.empty() && type[str[i]] == type[str[s.top()]]){ ^