Compilare: user.cpp: In function ‘int main()’: user.cpp:26:15: warning: unused variable ‘j’ [-Wunused-variable] int n,l,i,j; ^ user.cpp:27:15: warning: unused variable ‘p3’ [-Wunused-variable] long long p3,p5,s3,s5; ^ user.cpp:27:18: warning: unused variable ‘p5’ [-Wunused-variable] long long p3,p5,s3,s5; ^ user.cpp:28:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^