Compilare: user.cpp: In function ‘void transform(int*, std::string)’: user.cpp:27:9: warning: unused variable ‘n’ [-Wunused-variable] int n = s.size(), a = s.size()-1, b = s.size()-1; ^ user.cpp: In function ‘int mod(int*, int)’: user.cpp:51:10: warning: unused variable ‘X’ [-Wunused-variable] Huge X; ^ user.cpp: In function ‘int bit(int*)’: user.cpp:62:18: warning: unused variable ‘R’ [-Wunused-variable] int ret = 0, R; ^