Compilare: user.cpp: In function ‘void codare(nod*, int, std::bitset<60u>)’: user.cpp:118:43: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘long long unsigned int’ [-Wformat=] printf("%d %lu\n",x,b1.to_ullong()); ^ user.cpp: In function ‘void huffman()’: user.cpp:134:21: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long unsigned int’ [-Wformat=] printf("%d\n",lg); ^