Compilare: user.cpp: In function ‘int main()’: user.cpp:16:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:17:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;++i) fscanf(fin, "%d", &v[i]); ^ user.cpp:77:37: warning: ‘ans2’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%lld\n%d",ans1,ans2-1); ^