Compilare: user.c: In function ‘main’: user.c:29:18: warning: unused variable ‘j’ [-Wunused-variable] int i, n, k, T, j; ^ user.c:28:13: warning: unused variable ‘out’ [-Wunused-variable] FILE *in, *out; ^ user.c:34:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUTPUT, "w+", stdout); ^ user.c:36:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d\n", &T); ^ user.c:38:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &k); ^