根据先序和中序构建二叉树 测试样例: 先序:3,9,20,15,7 中序:9,3,15,20,7 结果:3,9,20,null,null,15,7 二叉树结构: public class TreeNode { int val; TreeNode left; TreeNode right; TreeNode(int x) { val = x; } }
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