Compilare: main.cpp: In function 'int main()': main.cpp:16:17: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s1[i]]++; ^ main.cpp:21:17: warning: array subscript has type 'char' [-Wchar-subscripts] fr1[s[i]]++; ^ main.cpp:25:20: warning: array subscript has type 'char' [-Wchar-subscripts] if (fr[s[i]]!=0) ^ main.cpp:27:24: warning: array subscript has type 'char' [-Wchar-subscripts] if (nr[s[i]]<fr[s[i]]) ^ main.cpp:27:33: warning: array subscript has type 'char' [-Wchar-subscripts] if (nr[s[i]]<fr[s[i]]) ^ main.cpp:29:60: warning: array subscript has type 'char' [-Wchar-subscripts] while (!q.empty()&&q.top()>s[i]&&nr[q.top()]-1+fr1[q.top()]>=fr[q.top()]) ^ main.cpp:29:75: warning: array subscript has type 'char' [-Wchar-subscripts] while (!q.empty()&&q.top()>s[i]&&nr[q.top()]-1+fr1[q.top()]>=fr[q.top()]) ^ main.cpp:29:88: warning: array subscript has type 'char' [-Wchar-subscripts] while (!q.empty()&&q.top()>s[i]&&nr[q.top()]-1+fr1[q.top()]>=fr[q.top()]) ^ main.cpp:31:31: warning: array subscript has type 'char' [-Wchar-subscripts] nr[q.top()]--; ^ main.cpp:35:24: warning: array subscript has type 'char' [-Wchar-subscripts] nr[s[i]]++; ^ main.cpp:38:17: warning: array subscript has type 'char' [-Wchar-subscripts] fr1[s[i]]--; ^