Compilare: user.c: In function ‘main’: user.c:14:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d%d", &n, &k ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:19:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( fin, "%d", &v[i] ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ user.c:54:5: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf ( fout, "%d", nr + 1 ); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~