Compilare: user.cpp: In function ‘int main()’: user.cpp:14:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++ fr[ s[i] ]; ^ user.cpp:18:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++ need[ p[i] ]; ^ user.cpp:19:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] -- fr[ p[i] ]; ^ user.cpp:30:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(need[s[i]]) { ^ user.cpp:31:41: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(pos && fr[ s[pos - 1] ] && s[i] < s[pos-1] ) { ^ user.cpp:33:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] -- fr[ s[pos] ]; ^ user.cpp:34:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++ need[ s[pos] ]; ^ user.cpp:37:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] -- need[ s[i] ]; ^ user.cpp:39:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] -- fr[ s[i] ]; ^