Compilare: user.cpp: In function ‘int main()’: user.cpp:15:11: warning: unused variable ‘x’ [-Wunused-variable] int n,x,y,z,i,j,aux; ^ user.cpp:15:13: warning: unused variable ‘y’ [-Wunused-variable] int n,x,y,z,i,j,aux; ^ user.cpp:15:15: warning: unused variable ‘z’ [-Wunused-variable] int n,x,y,z,i,j,aux; ^ user.cpp:18:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d%d",&n,&a[1],&b[1],&c[1]); ^