EatingFrenzy.java

package me.august;

import java.util.Scanner;

/**
 * Created by August on 10/21/2014.
 */
public class EatingFrenzy {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        while (true) {
            String[] parts = scanner.nextLine().split(" ");
            int[] nums = new int[parts.length];
            for (int i = 0; i < parts.length; i++) {
                nums[i] = Integer.parseInt(parts[i]);
            }
            printNode(tree(nums));
        }
    }

    private static Node tree(int[] arr) {
        return tree(0, arr);
    }

    private static Node tree(int idx, int[] arr) {
        Node node = new Node();
        node.value = arr[idx];
        int base = idx * 2;
        if (base + 1 < arr.length) {
            node.left = tree(base + 1, arr);
        }
        if (base + 2 < arr.length) {
            node.right = tree(base + 2, arr);
        }
        return node;
    }

    private static void printNode(Node node) {
        if (node.right != null) printNode(node.right);
        if (node.left != null) printNode(node.left);
        System.out.print(node.value + " ");
    }

    private static class Node {
        int value;
        Node left;
        Node right;
    }
}