}//Find the middle element for the list.ListNode mid = this.findMiddleElement(head);//The mid becomes the root of the BST.TreeNode node =newTreeNode(mid.val);//Base case when there is just one element in the linked listif(head ==mid) {returnnode; }//Recursively form balanced BSTs ...
可以看到,当fast == NULL或fast->next == NULL时(终止条件),返回的slow指针恰恰就是链表的中间节点。 struct ListNode* middleNode(struct ListNode* head){ struct ListNode* slow = head; struct ListNode* fast = head; while(fast != NULL && fast->next != NULL) { slow = slow->next; fast = ...
ListNode* middleNode(ListNode* head) { if(head==nullptr) return head; ListNode *p1=head, *p2=head;while(p2 && p2->next){p1=p1->next;p2=p2->next->next; } return p1; } };方法二、按顺序将每个结点放入数组 A 中。然后中间结点就是 A[A.Length/2],因为可以通过索引检索每个结点。 标签...
class Node { Node parent; Node left; Node right; int startIndex; int endIndex; int sum; } public class NumArray { private Node treeRoot; public NumArray(int[] nums) { if (nums!=null && nums.length!=0) { this.treeRoot = new Node(); buildTree(this.treeRoot, nums, 0, nums.len...
448 Find All Numbers Disappeared in an Array 52.9% Easy 449 Serialize and Deserialize BST 46.1% Medium 450 Delete Node in a BST 39.4% Medium 451 Sort Characters By Frequency 55.8% Medium 452 Minimum Number of Arrows to Burst Balloons 46.2% Medium 453 Minimum Moves to Equal Array Elements 49....
B[], int n) { int total = m + n; if (total & 0x1) return find_kth(A,...
ans.add(node.val); pre = node; node = null; } else { // 把node放回去,去右子树。 stack.push(node); node = node.right; }} LeetCode173 Medium 二叉树搜索迭代器 leetcode-cn.com/problem 用while走到最左节点,顺便入栈。 访问cur,curNode = curNode.right ...
2095 Delete the Middle Node of a Linked List Medium Go 2121 Intervals Between Identical Elements Medium Go 2130 Maximum Twin Sum of a Linked List Medium Go 2164 Sort Even and Odd Indices Independently Easy Go 2215 Find the Difference of Two Arrays Easy Go 2300 Successful Pairs of Spells and...
0744 Find Smallest Letter Greater Than Target LeetCode 力扣 Python CSDN Easy 二分 0783 Minimum Distance Between BST Nodes二叉搜索树节点最小距离 LeetCode 力扣 Python CSDN Easy 二叉树 0836 Rectangle Overlap LeetCode 力扣 Python CSDN Easy 数学 0876 Middle of the Linked List LeetCode 力扣 Python CSD...
Populate each next pointer to point to its next right node. If there is no next right node, the next pointer should be set toNULL. Initially, all next pointers are set toNULL. Note: You may only use constant extra space. You may assume that it is a perfect binary tree (ie, all le...