Commit 3388586

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Add Solution2.java to problems 0590

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	`1`	`+/**`
	`2`	`+ * // Definition for a Node.`
	`3`	`+ * class Node {`
	`4`	`+ * public int val;`
	`5`	`+ * public List<Node> children;`
	`6`	`+ *`
	`7`	`+ * public Node() {}`
	`8`	`+ *`
	`9`	`+ * public Node(int _val) {`
	`10`	`+ * val = _val;`
	`11`	`+ * }`
	`12`	`+ *`
	`13`	`+ * public Node(int _val, List<Node> _children) {`
	`14`	`+ * val = _val;`
	`15`	`+ * children = _children;`
	`16`	`+ * }`
	`17`	`+ * };`
	`18`	`+ */`
	`19`	`+class Solution {`
	`20`	`+ public List<Integer> postorder(Node root) {`
	`21`	`+ List<Integer> res = new ArrayList<>();`
	`22`	`+ if (root != null) {`
	`23`	`+ List<Node> childs = root.children;`
	`24`	`+ if (childs != null) {`
	`25`	`+ for (Node node : childs) {`
	`26`	`+ res.addAll(postorder(node));`
	`27`	`+ }`
	`28`	`+ }`
	`29`	`+ res.add(root.val);`
	`30`	`+ }`
	`31`	`+ return res;`
	`32`	`+ }`
	`33`	`+}`

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