Compilare: user.cpp: In function ‘int main()’: user.cpp:7:17: warning: unused variable ‘x’ [-Wunused-variable] { long long n,x,y,inv,uc,co,c=0,k=0,i; ^ user.cpp:7:19: warning: unused variable ‘y’ [-Wunused-variable] { long long n,x,y,inv,uc,co,c=0,k=0,i; ^ user.cpp:7:21: warning: unused variable ‘inv’ [-Wunused-variable] { long long n,x,y,inv,uc,co,c=0,k=0,i; ^ user.cpp:7:31: warning: unused variable ‘c’ [-Wunused-variable] { long long n,x,y,inv,uc,co,c=0,k=0,i; ^ user.cpp:10:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&n); ^