Compilare: main.cpp: In function 'int main()': main.cpp:27:12: warning: array subscript has type 'char' [-Wchar-subscripts] 27 | vf[c[i]] ++; | ~~~^ main.cpp:28:16: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | if (vf[c[i]] == 1) ct++; | ~~~^ main.cpp:31:21: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | if (vf[c[st]] == 1) ct = ct - 1; | ~~~~^ main.cpp:33:17: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | vf[c[st]] = vf[c[st]] - 1; | ~~~~^ main.cpp:33:29: warning: array subscript has type 'char' [-Wchar-subscripts] 33 | vf[c[st]] = vf[c[st]] - 1; | ~~~~^