https://www.acmicpc.net/problem/10871
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int x = sc.nextInt();
int[] a = new int[n];
for (int i = 0; i < n; i++) {
a[i] = sc.nextInt();
}
for (int j = 0; j < n; j++) { // X보다 작은 수를 모두 출력
if(a[j] < x){
System.out.print(a[j] + " ");
}
}
}
}