Compilare: user.cpp: In function ‘void transform(int*, std::string)’: user.cpp:12:9: warning: unused variable ‘n’ [-Wunused-variable] int n = s.size(), a = s.size()-9, b = s.size()-1; ^ user.cpp: In function ‘int bit(int*)’: user.cpp:38:21: warning: unused variable ‘ones’ [-Wunused-variable] int ret = 0, R, ones = 0; ^