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Copy pathLine2.java
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52 lines (50 loc) · 1.39 KB
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package codingtest;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
public class Line2 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String[] numbers = sc.nextLine().split(" ");
int k = sc.nextInt();
int[] arr = new int[numbers.length];
for(int i=0; i<arr.length; i++) {
arr[i] = Integer.parseInt(numbers[i]);
}
Set<Integer> set = new HashSet<>();
for(int i=1; i<=arr.length; i++) {
permutation(set, arr, 0, i);
}
// System.out.println(set);
ArrayList<Integer> list = new ArrayList<>(set);
Collections.sort(list);
// System.out.println(list);
System.out.println(list.get(k-1));
sc.close();
}
static void swap(int[] arr, int a, int b) {
int tmp = arr[a];
arr[a] = arr[b];
arr[b] = tmp;
}
static void permutation(Set<Integer> set, int[] arr, int index, int r) {
if(index == r && r == arr.length)
set.add(createInteger(arr, r));
else {
for(int i=0; i+index < arr.length; i++) {
swap(arr, index, index+i);
permutation(set, arr, index+1, r);
swap(arr, index, index+i);
}
}
}
static int createInteger(int[] arr, int r) {
StringBuilder sb = new StringBuilder();
for(int i=0; i<r; i++)
sb.append(arr[i]);
// System.out.println("r : " + r + "sb : " + sb.toString());
return Integer.parseInt(sb.toString());
}
}