Compilare: user.cpp: In function ‘int main()’: user.cpp:7:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lli",&n); ^ user.cpp:9:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lli",&v[i]); ^ user.cpp:24:14: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=k-1;i>=0;i--) ^