Compilare: user.cpp: In function ‘int main()’: user.cpp:56:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[nrs][++b[nrs][0]]=a1[i]; ^ user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (nr<v[i].size() && v[i][nr]<=ult) ^ user.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (nr<v[i].size()) ^