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LeetCode--Convert Sorted List to Binary Search Tree
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ /** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: TreeNode *sortedListToBST(ListNode *head) { if(head == NULL) return NULL; vector<int> res; ListNode* pre = head; while(pre!=NULL) { res.push_back(pre->val); pre = pre->next; } int n=res.size(); return sortedArrayToBST(res,0,n-1); } TreeNode *sortedArrayToBST(vector<int> &num, int low, int high) { if(low>high) return NULL; if(low == high) { return new TreeNode(num[low]); } int mid = (low+high)/2; TreeNode* root = new TreeNode(num[mid]); root->left = sortedArrayToBST(num,low,mid-1); root->right = sortedArrayToBST(num,mid+1,high); return root; } };
LeetCode--Convert Sorted List to Binary Search Tree
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