Compilare: user.c: In function ‘main’: user.c:17:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &T); ^ user.c:22:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %llu %d\n", &N, &M, &X); ^ user.c:24:10: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%llu ", &elem); ^ user.c:11:33: warning: ‘v_x’ may be used uninitialized in this function [-Wmaybe-uninitialized] unsigned long long M, elem, S, v_x, index; ^