https://leetcode.com/problems/validate-stack-sequences/ find out an element in the given sorted row and coloumn matrix. https://leetcode.com/problems/linked-list-cycle/ Top view of a binary Tree psuedo code for Topological sort Again two interviewers started from intro and explain one of yo...
https://leetcode.cn/problems/number-of-ways-to-reconstruct-a-tree 这道题曾经在周赛难度分top1呆了几年,如今已经不在难度分top5了。破局的关键是父节点的邻居数肯定不少于子节点,而根节点的邻居数一定是n-1。所以应该先找到根节点,然后逐层向下建树,子节点的邻居一定是父节点的子集,否则就是非法;如果子...
0199.binary-tree-right-side-view 0200.number-of-islands 🆕 0201.bitwise-and-of-numbers-range 0208.implement-trie-prefix-tree 0209.minimum-size-subarray-sum 0215.kth-largest-element-in-an-array 🆕 0221.maximal-square 🆕 0229.majority-element-ii 🆕 0230.kth-smallest-element-in-a-bst 023...
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LeetCode Top 100 Liked Questions 236. Lowest Common Ancestor of a Binary Tree (Java版; Medium) 题目描述 Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined betw...
LeetCode Top 100 Liked Questions 98. Validate Binary Search Tree (Java版; Medium) 题目描述 Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node's key...
* TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * };*/classSolution {public:intmaxPathSum(TreeNode*root) { rec(root);returnmax; }intrec(TreeNode *root) {if(root ==NULL)return0;intl = rec(root->left);intr = rec(root->right);if(root->val>max...
View Code 3、NC45 实现二叉树先序,中序和后序遍历 importjava.util.*;/** public class TreeNode {* int val = 0;* TreeNode left = null;* TreeNode right = null;* }*/publicclassSolution{/***@paramroot TreeNode类 the root of binary tree*@returnint整型二维数组*/publicint[][] three...
Check the consistency of the numbers (Trie Data Structure Question) Constructing the Array Range Minimum Query PPATH - Prime Path Problem Leetcode Problem Solution Count Number of Nodes in a Complete Binary Tree (Leetcode Problem Solution)
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