Compilare: user.cpp: In function ‘long long int freq(long long int, long long int)’: user.cpp:43:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cnt+i<v[c].size() && v[c][cnt+i]<=poz)cnt+=i; ^ user.cpp:43:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cnt+i<v[c].size() && v[c][cnt+i]<=poz)cnt+=i; ^ user.cpp:48:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long frlit=fr[littt]; ^ user.cpp:49:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long frcaps=fr[caps(littt)]; ^ user.cpp: In function ‘int main()’: user.cpp:78:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(auto c:s)++fr[c]; ^ user.cpp:79:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=0;i<n;++i)v[s[i]].pb(i+1); ^