Compilare: user.cpp: In function ‘int main()’: user.cpp:43:20: warning: unused variable ‘iterator’ [-Wunused-variable] int n , k , i=0 ,iterator , *v, *a; ^ user.cpp:49:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d" , &n) ; ^ user.cpp:50:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d" , &k) ; ^