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Given a linked list, remove the nth node from the end of the list and return its head. For example, Given linked list: 1->2->3->4->5, an…
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Sum of Root To Leaf Binary Numbers - Tree - Easy - LeetCode
You are given the root of a binary tree where each node has a value 0 or 1. Each root-to-leaf path represents a binary number starting with the most significant bit. For example, if the pa…
Cousins in Binary Tree - Tree - Easy - LeetCode
In a binary tree, the root node is at depth 0, and children of each depth k node are at depth k+1. Two nodes of a binary…
Univalued Binary Tree - Tree - Easy - LeetCode
A binary tree is univalued if every node in the tree has the same value. Return true if and only if the given tree is un…
Range Sum of BST - Tree - Easy - LeetCode
Given the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive…
Increasing Order Search Tree - Tree - Easy - LeetCode
Given a binary search tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the …
Leaf-Similar Trees - Tree - Easy - LeetCode
Consider all the leaves of a binary tree, from left to right order, the values of those leaves form a leaf value sequenc…
Minimum Distance Between BST Nodes - Tree - Easy - LeetCode
Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two di…
Search in a Binary Search Tree - Tree - Easy - LeetCode
Given the root node of a binary search tree (BST) and a value. You need to find the node in the BST that the node's valu…
Longest Univalue Path - Tree - Easy - LeetCode
Given a binary tree, find the length of the longest path where each node in the path has the same value. This path may o…
Second Minimum Node In a Binary Tree - Tree - Easy - LeetCode
Given a non-empty special binary tree consisting of nodes with the non-negative value, where each node in this tree has …
Trim a Binary Search Tree - Tree - Easy - LeetCode
Given the root of a binary search tree and the lowest and highest boundaries as low and high, trim the tree so that all …
Two Sum IV - Input is a BST - Tree - Easy - LeetCode
Given the root of a Binary Search Tree and a target number k, return true if there exist two elements in the BST such th…
Average of Levels in Binary Tree - Tree - Easy - LeetCode
Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array.Example 1:Inp…
Merge Two Binary Trees - Tree - Easy - LeetCode
Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are ove…
Construct String from Binary Tree - Tree - Easy - LeetCode
You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way.…