Compilare: user.c: In function ‘main’: user.c:8:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &t); ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld%lld%lld", &n, &m, &x); ^ user.c:13:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%lld", &nr); ^ user.c:19:17: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] a = s - m - k + 1; ^