Compilare: user.cpp: In function ‘long long int freq(long long int, long long int)’: user.cpp:41:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cnt+i<v[littt].size() && v[littt][cnt+i]<=poz)cnt+=i; ^ user.cpp:41:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(cnt+i<v[littt].size() && v[littt][cnt+i]<=poz)cnt+=i; ^ user.cpp:46:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long frlit=fr[littt]; ^ user.cpp:47:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] long long frcaps=fr[caps(littt)]; ^ user.cpp: In function ‘int main()’: user.cpp:75:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(auto c:s)++fr[c]; ^ user.cpp:76:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=0;i<n;++i)v[s[i]].pb(i+1); ^