Compilare: user.cpp: In function ‘int main()’: user.cpp:46:21: warning: unused variable ‘y’ [-Wunused-variable] long long p,y,i,r,x; ^ user.cpp:46:27: warning: unused variable ‘x’ [-Wunused-variable] long long p,y,i,r,x; ^ user.cpp:42:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld%lld%lld",&v,&n,&u); ^