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POrecursion using a hashmap
 

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    <p>I have an array that has the following numbers</p> <pre><code>int[] arr = {2,4,3,1,5,6,0,7,8,9,10,11,12,13,14,15}; </code></pre> <p>Or any other order for that matter. I need to make all the possible combinations for the numbers using a recursion but satisfying a condition that the next number clubbed with the present one can only be from specific numbers given by a hashmap: ex <strong>When the recursion takes 1 the next number can be from {0,4,5,2,6} (from the HaspMap),and then if i make 10,the next number can be from {1,4,5}</strong> and so on</p> <pre><code>static HashMap&lt;Integer,Integer[]&gt; possibleSeq = new HashMap&lt;Integer,Integer[] &gt;(); private static void initialize(HashMap&lt;Integer,Integer[]&gt; possibleSeq) { possibleSeq.put(0,new Integer[]{1,4,5}); possibleSeq.put(1,new Integer[]{0,4,5,2,6}); possibleSeq.put(2,new Integer[]{1,3,5,6,7}); possibleSeq.put(3,new Integer[]{2,6,7}); possibleSeq.put(4,new Integer[]{0,1,5,8,9}); possibleSeq.put(5,new Integer[]{0,1,2,4,6,8,9,10}); possibleSeq.put(6,new Integer[]{1,2,3,5,7,9,10,11}); possibleSeq.put(7,new Integer[]{2,3,6,10,11}); possibleSeq.put(8,new Integer[]{9,4,5,12,13}); possibleSeq.put(9,new Integer[]{10,4,5,8,6,12,13,14}); possibleSeq.put(10,new Integer[]{7,6,5,9,11,15,13,14}); possibleSeq.put(11,new Integer[]{6,7,10,14,15}); possibleSeq.put(12,new Integer[]{8,9,13}); possibleSeq.put(13,new Integer[]{8,9,10,12,14}); possibleSeq.put(14,new Integer[]{9,10,11,13,15}); possibleSeq.put(15,new Integer[]{10,11,14}); } </code></pre> <p>Note: I am required to make all the possible numbers beginning from digit length 1 to 10. Help!</p>
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