Compilare: main.cpp: In function 'int main()': main.cpp:62:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=cn;++i) ~^~~~ main.cpp:10:44: warning: unused variable 'x' [-Wunused-variable] unsigned long long n,s=0,cn; long long x,nc=0,p,i,mw,ok; ^ main.cpp:10:55: warning: unused variable 'mw' [-Wunused-variable] unsigned long long n,s=0,cn; long long x,nc=0,p,i,mw,ok; ^~