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AbsolutePermutation.java
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AbsolutePermutation.java
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import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;
public class AbsolutePermutation {
// https://www.hackerrank.com/challenges/absolute-permutation/problem
// Complete the absolutePermutation function below.
static int[] absolutePermutation(int n, int k) {
if(k == 0) {
int[] a = new int[n];
for (int i = 0; i < a.length; i++) {
a[i] = i+1;
}
return a;
}
if(n%2 == 1) {
// if(n-k <2 || n-k >n/2) {
int[] a = {-1};
return a;
// }else {
//
// }
}else {
if(n/2 < k || n%(2*k) != 0) {
int[] a = {-1};
return a;
}else {
int[] a = new int[n];
for (int i = 0; i < a.length; i++) {
a[i] = i+1;
}
return swap(a, k);
}
}
}
static int[] swap(int[] a , int swapJumper) {
int temp = 0;
int[] swapped = new int[a.length];
for(int i = 0 ; i<a.length ; i++) {
if(i+swapJumper >=a.length)
break;
if(swapped[i] == 1)
continue;
temp = a[i] ;
a[i] =a[i+swapJumper];
a[i+swapJumper] = temp;
swapped[i] = 1;
swapped[i+swapJumper] = 1;
}
return a;
}
private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) throws IOException {
BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
int t = scanner.nextInt();
scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
for (int tItr = 0; tItr < t; tItr++) {
String[] nk = scanner.nextLine().split(" ");
int n = Integer.parseInt(nk[0]);
int k = Integer.parseInt(nk[1]);
int[] result = absolutePermutation(n, k);
for (int i = 0; i < result.length; i++) {
bufferedWriter.write(String.valueOf(result[i]));
if (i != result.length - 1) {
bufferedWriter.write(" ");
}
}
bufferedWriter.newLine();
}
bufferedWriter.close();
scanner.close();
}
}