Compilare: user.cpp: In function ‘int main()’: user.cpp:30:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] int l = 1 + arr[first].count; ^ user.cpp:31:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[n] = arr[first].pos; ^ user.cpp:33:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(l > arr[last].count) ^ user.cpp:35:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] arr[last].count = l; ^ user.cpp:36:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] arr[last].pos = n; ^ user.cpp:47:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(max_count < arr[a].count) ^ user.cpp:49:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] max_count = arr[a].count; ^ user.cpp:57:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] int p = arr[last_letter].pos; ^ user.cpp:57:30: warning: ‘last_letter’ may be used uninitialized in this function [-Wmaybe-uninitialized] int p = arr[last_letter].pos; ^