Input: N sorted arrays of integers (in ascending order)
Output: Final sorted array of integers
public static class Node { int index = 0; List<Integer> list; public Node(List<Integer> list) { this.list = list; } public int peek() { return list.get(index); } public int next() { return list.get(index++); } public boolean hasNext() { return index < list.size(); } } List<Integer> sortData(List<List<Integer>> numArray) { List<Integer> result = new ArrayList<>(); Queue<Node> queue = new PriorityQueue<>(new Comparator<Node>(){ public int compare(Node n1, Node n2) { return n1.peek() - n2.peek(); } }); for(List<Integer> list:numArray) { if(list != null && list.size() > 0) { queue.offer(new Node(list)); } } while(!queue.isEmpty()) { Node node = queue.poll(); result.add(node.next()); if(node.hasNext()) { queue.offer(node); } } return result; }
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