Compilare: main.cpp: In function 'int main()': main.cpp:25:8: warning: array subscript has type 'char' [-Wchar-subscripts] q[c].push(k); ^ main.cpp:31:16: warning: array subscript has type 'char' [-Wchar-subscripts] while (!q[c].empty()) { ^ main.cpp:32:14: warning: array subscript has type 'char' [-Wchar-subscripts] k = q[c].front(); ^ main.cpp:37:10: warning: array subscript has type 'char' [-Wchar-subscripts] q[c].pop(); ^