Compilare: user.c: In function ‘main’: user.c:17:15: warning: unused variable ‘j’ [-Wunused-variable] int n, k, i, j; ^ user.c:23:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:24:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &k); ^ user.c:28:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &val[i]); ^