Compilare: user.cpp: In function ‘int main()’: user.cpp:15:22: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] while(f>>sir[++k]+1) ^ user.cpp:23:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] d[sir[i][sir[i][0]]-'a']=d[sir[i][1]-'a']+1; ^ user.cpp:24:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] ult[sir[i][sir[i][0]]-'a']=i; ^