[백준] 10871 : X보다 작은 수 JAVA 풀이

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.IOException;
import java.util.StringTokenizer;

public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        StringTokenizer st = new StringTokenizer(br.readLine(), " ");
        
        int N = Integer.parseInt(st.nextToken());
        int X = Integer.parseInt(st.nextToken());
        
        StringBuilder sb = new StringBuilder();
        st = new StringTokenizer(br.readLine(), " ");
        
        for(int i=0;i<N;i++){
            int num = Integer.parseInt(st.nextToken());
            if(num<X){
                sb.append(num).append(' ');
            }
        }
        System.out.println(sb);
    }
}