Compilare: user.c: In function ‘shell’: user.c:37:16: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, d, aux, dist, gap = n; ^ user.c: In function ‘read’: user.c:28:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN, "r", stdin); ^ user.c:30:11: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:32:34: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] for(i = 0; i < n; i++) scanf("%d", &arr[ i ]); ^ user.c: In function ‘write’: user.c:63:13: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^