Compilare: user.cpp:8:4: warning: "/*" within comment [-Wcomment] /* for(i=1;(long long) i*i<a; i++) ^ user.cpp: In function ‘int main()’: user.cpp:31:29: warning: unused variable ‘aux’ [-Wunused-variable] long long a,b,nb=0,na=0,aux; ^ user.cpp:33:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lld%lld",&a,&b); ^