Compilare: main.cpp: In function 'int main()': main.cpp:18:24: warning: array subscript has type 'char' [-Wchar-subscripts] if (fr[s[i]]==0) ^ main.cpp:20:24: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s[i]]=1; ^ main.cpp:22:21: warning: array subscript has type 'char' [-Wchar-subscripts] rez[s[i]]+=p; ^