Bittilista

//package bittilista;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

/**
 *
 * @author Adreno
 */
public class Bittilista {
    
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        long k = s.nextLong()-1;

        long count = 0;
        String vastaus = "";
        long left = (long) Math.pow(2,n-1);
        while (count != k) {
            //System.out.println("string=" + vastaus + ", count="+count + ", k=" + k + ", left=" + left);
            left /= 2;
            if (count+left <= k) {
                vastaus += "1";
                count += left;
            }
            else {
                vastaus += "0";
            }
        }
        while (vastaus.length() < n-1) vastaus += "0";
        vastaus += vastaus.charAt(0);
        System.out.println(vastaus);
    }
    
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED