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数据结构
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# 数据结构
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## 面试题3 二维数组中的查找
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## 面试题3 二维数组中的查找 [LeetCode](https://leetcode.com/problems/search-a-2d-matrix-ii/)
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> 题目:二维数组中,每行从左到右递增,每列从上到下递增,给出一个数,判断它是否在数组中
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>
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> 思路:从左下角或者右上角开始比较
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print links.val
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```
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## 面试题6 重建二叉树
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## 面试题6 重建二叉树 [LeetCode](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)
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> 要求:用前序和中序遍历结果构建二叉树,遍历结果中不包含重复值
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> 思路:前序的第一个元素是根结点的值,在中序中找到该值,中序中该值的左边的元素是根结点的左子树,右边是右子树,然后递归的处理左边和右边

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