Compilare: main.cpp: In function 'int nrz(long long unsigned int)': main.cpp:9:9: warning: unused variable 'k' [-Wunused-variable] int k,nrzero; ^ main.cpp: In function 'int cb(long long unsigned int, long long unsigned int)': main.cpp:25:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(NR == n) ~~~^~~~ main.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(NR < n) ~~~^~~ main.cpp:20:9: warning: unused variable 'OK' [-Wunused-variable] int OK = 0; ^~