Compilare: user.cpp: In function ‘int main()’: user.cpp:14:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(auto i:s)++fr[i]; ^ user.cpp:15:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(auto i:s)prez[i]=1; ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(prez[c] && abs(fr[c]-(fr[i]+1))>1 && fr[c]<fr[i]) ^ user.cpp:20:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(prez[c] && abs(fr[c]-(fr[i]+1))>1 && fr[c]<fr[i]) ^ user.cpp:20:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(prez[c] && abs(fr[c]-(fr[i]+1))>1 && fr[c]<fr[i]) ^ user.cpp:20:57: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(prez[c] && abs(fr[c]-(fr[i]+1))>1 && fr[c]<fr[i]) ^ user.cpp:20:63: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(prez[c] && abs(fr[c]-(fr[i]+1))>1 && fr[c]<fr[i]) ^ user.cpp:23:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++fr[c]; ^ user.cpp:26:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(sem==0)++fr[i]; ^