Compilare: user.cpp: In function ‘int main()’: user.cpp:12:15: warning: unused variable ‘j’ [-Wunused-variable] int n,k,i,j,x,y; ^ user.cpp:12:17: warning: unused variable ‘x’ [-Wunused-variable] int n,k,i,j,x,y; ^ user.cpp:12:19: warning: unused variable ‘y’ [-Wunused-variable] int n,k,i,j,x,y; ^ user.cpp:17:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&k); ^ user.cpp:19:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^