Compilare: user.cpp: In function ‘int check(long long unsigned int)’: user.cpp:31:9: warning: unused variable ‘nod’ [-Wunused-variable] int nod; ^ user.cpp: In function ‘long long unsigned int binS(long long int, long long int)’: user.cpp:76:9: warning: unused variable ‘ch2’ [-Wunused-variable] int ch2 = check(mid-1); ^ user.cpp: In function ‘int main()’: user.cpp:115:17: warning: ‘O’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << O; ^