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public class Solution { public TreeNode invertTree(TreeNode root) { if (root == null) { return null; } root.left = invertTree(root.left); root.right = invertTree(root.right); TreeNode tmp = root.left; root.left = root.right; root.right = tmp; return root; } }
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原文地址：http://www.cnblogs.com/happykoukou/p/5329977.html
