Compilare: main.cpp: In function 'long long int freq(long long int, long long int)': main.cpp:44:25: warning: array subscript has type 'char' [-Wchar-subscripts] if(cnt+i<v[c].size() && v[c][cnt+i]<=poz)cnt+=i; ^ main.cpp:44:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cnt+i<v[c].size() && v[c][cnt+i]<=poz)cnt+=i; ~~~~~^~~~~~~~~~~~ main.cpp:44:40: warning: array subscript has type 'char' [-Wchar-subscripts] if(cnt+i<v[c].size() && v[c][cnt+i]<=poz)cnt+=i; ^ main.cpp:49:29: warning: array subscript has type 'char' [-Wchar-subscripts] long long frlit=fr[littt]; ^ main.cpp:50:36: warning: array subscript has type 'char' [-Wchar-subscripts] long long frcaps=fr[caps(littt)]; ^ main.cpp: In function 'int main()': main.cpp:79:24: warning: array subscript has type 'char' [-Wchar-subscripts] for(auto c:s)++fr[c]; ^ main.cpp:80:31: warning: array subscript has type 'char' [-Wchar-subscripts] for(int i=0;i<n;++i)v[s[i]].pb(i+1); ^