백준 - 11004 (K번째 수)

 

[내장메서드를 이용한 정렬]

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.StringTokenizer;

public class Main {
	public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        StringTokenizer st1 = new StringTokenizer(br.readLine());
  
        int n = Integer.parseInt(st1.nextToken());  
        int k = Integer.parseInt(st1.nextToken());  
        
        StringTokenizer st2 = new StringTokenizer(br.readLine());
        
        ArrayList<Integer> list = new ArrayList<>();
        while (st2.hasMoreTokens()) {
            list.add(Integer.parseInt(st2.nextToken())); 
        }

        list.sort(Comparator.naturalOrder());
        System.out.println(list.get(k - 1));
	}

}