Compilare: user.cpp: In function ‘int main()’: user.cpp:34:11: warning: unused variable ‘k’ [-Wunused-variable] int n,k,i,j,l; ^ user.cpp:34:15: warning: unused variable ‘j’ [-Wunused-variable] int n,k,i,j,l; ^ user.cpp:35:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&n); ^ user.cpp:38:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&v[i]); ^