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feat(二叉树理论基础.md): 新增java版本
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@ -188,6 +188,21 @@ struct TreeNode {
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Java:
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```java
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public class TreeNode {
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int val;
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TreeNode left;
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TreeNode right;
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TreeNode() {}
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TreeNode(int val) { this.val = val; }
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TreeNode(int val, TreeNode left, TreeNode right) {
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this.val = val;
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this.left = left;
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this.right = right;
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}
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}
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```
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Python:
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