leetcode-java-108. Convert Sorted Array to Binary Search Tree
2016-08-16 14:45
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/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ /* 二叉搜索树特点:小的值在左边,大的值在右边 这样的结构有一个好处是很容易获得最大值(Maximum)、最小值(minimum)、某元素的前驱(Precursor)、某元素的后继(Successor)。 最大值:树的最右节点。 最小值:树的最左节点。 某元素前驱:左子树的最右。 某元素的后继:右子树的最左。 思路: 1.找到排序数组的中点 2.递归生成左子树和右子树 */ public class Solution { public TreeNode sortedArrayToBST(int[] nums) { if(nums.length == 0) { return null; } return sortedArrayToBST(nums,0,nums.length - 1); } public TreeNode sortedArrayToBST(int[] nums,int start,int end) { int mid = (start + end) /2, val = nums[mid]; if(start > end) { return null; } TreeNode root = new TreeNode(val); root.left = sortedArrayToBST(nums,start,mid - 1); root.right = sortedArrayToBST(nums,mid + 1,end); return root; } }
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