백준 : 25305번 커트라인
import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
public class problem23 {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int number = in.nextInt();
int cutLine = in.nextInt();
// 래퍼럴 타입으로 해야 Collections.reverse 사용가능
Integer [] array = new Integer[number];
for (int i = 0; i < number; i++) {
array[i] = in.nextInt();
}
// 배열을 내림차순으로 정렬하기위해 reverse
Arrays.sort(array, Collections.reverseOrder());
System.out.println(array[cutLine-1]);
}
}