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[每日 LeetCode] 226. Invert Binary Tree
原文链接 [链接] Description: Invert a binary tree. Example: Input: 4 / \ 2 7 / \ / \ 1 3 6 9 Output: 4 / \ 7 2 / \ / \ 9 6 3 1 Trivia: This problem was inspired by [链 ..
174
5 年前
[每日 LeetCode] 206. Reverse Linked List
Description: Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL Follow up: A linked lis ..
171
5 年前
[每日 LeetCode] 141. Linked List Cycle
Description: Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos which represents the p ..
110
5 年前
[每日 LeetCode] 203. Remove Linked List Elements
Description: Remove all elements from a linked list of integers that have value val. Example: Input: 1->2->6->3->4->5->6, _**val**_ = 6 Output ..
107
5 年前
[每日 LeetCode] 707. Design Linked List
Description: Design your implementation of the linked list. You can choose to use the singly linked list or the doubly linked list. A node in a singly linked li ..
370
5 年前
[每日 LeetCode] 234. Palindrome Linked List
Description: Given a singly linked list, determine if it is a palindrome. Example 1: Input: 1->2 Output: false Example 2: Input: 1->2->2->1 Output: ..
166
5 年前
每日 LeetCode] 1021. Remove Outermost Parentheses
Description: A valid parentheses string is either empty (''),'(' + A + ')', or A + B, where A and B are valid parentheses strings, and + represents string conca ..
139
5 年前
每日 LeetCode] 844. Backspace String Compare
Description: Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character. Example 1: Input: S ..
112
5 年前
[每日 LeetCode] 682. Baseball Game
原文链接 [链接] Description: You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: Integer (one round's ..
115
5 年前
[每日 LeetCode] 496. Next Greater Element I
原文链接 [链接] Description: You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next greater numbe ..
108
5 年前
[每日 LeetCode] 232. Implement Queue using Stacks
原文链接 [链接] Description: Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element ..
108
5 年前
[每日 LeetCode] 225. Implement Stack using Queues
原文链接 [链接] Description: Implement the following operations of a stack using queues. push(x) -- Push element x onto stack. pop() -- Removes the element on top of ..
87
5 年前
[每日 LeetCode] 155. Min Stack
原文链接 [链接] Description: Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) -- Push element x onto stack. p ..
95
5 年前
[每日 LeetCode] 20. Valid Parentheses
原文链接 [链接] Description: Given a string containing just the characters '(' , ')' , '{' , '}' , '[' and ']' , determine if the input string is valid. An input stri ..
104
5 年前
[每日 LeetCode] 1022. Sum of Root To Leaf Binary Numbers
原文链接 [每日 LeetCode] 1022. Sum of Root To Leaf Binary Numbers Description: Given a binary tree, each node has value 0 or 1. Each root-to-leaf path represents a bi ..
525
5 年前
[每日 LeetCode] 993. Cousins in Binary Tree
原文链接 [每日 LeetCode] 993. Cousins in Binary Tree Description In a binary tree, the root node is at depth 0, and children of each depth k node are at depth k+1. Tw ..
177
5 年前
[每日 LeetCode] 965. Univalued Binary Tree
原文链接 [每日 LeetCode] 965. Univalued Binary Tree Description: A binary tree is univalued if every node in the tree has the same value. Return true if and only if t ..
174
5 年前
[每日 LeetCode] 938. Range Sum of BST
原文链接 [链接] Description: Given the root node of a binary search tree, return the sum of values of all nodes with value between L and R (inclusive). The binary sea ..
202
5 年前
[每日 LeetCode] 897. Increasing Order Search Tree
原文链接 [链接] Description: Given a tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, and every node has no lef ..
157
5 年前
[每日 LeetCode] 872. Leaf-Similar Trees
原文链接 [每日 LeetCode] 872. Leaf-Similar Trees Description: Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a le ..
146
5 年前
[每日 LeetCode] 783. Minimum Distance Between BST Nodes
原文链接 [链接] Description: Given a Binary Search Tree (BST) with the root node root, return the minimum difference between the values of any two different nodes in ..
198
5 年前
[每日 LeetCode] 700. Search in a Binary Search Tree
原文链接 [链接] Description: 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 value equals the give ..
143
5 年前
[每日 LeetCode] 653. Two Sum IV - Input is a BST
原文链接 [链接] Description: Given a Binary Search Tree and a target number, return true if there exist two elements in the BST such that their sum is equal to the gi ..
121
5 年前
[每日 LeetCode] 104. Maximum Depth of Binary Tree
原文链接 [链接] Description: Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to t ..
142
5 年前
[每日 LeetCode] 100. Same Tree
原文链接 [链接] Description: Given two binary trees, write a function to check if they are the same or not. Two binary trees are considered the same if they are struc ..
118
5 年前
[每日 LeetCode] 572. Subtree of Another Tree
原文链接 [链接] Description: Given two non-empty binary trees s and t , check whether tree t has exactly the same structure and node values with a subtree of s. A sub ..
326
5 年前
[每日 LeetCode] 559. Maximum Depth of N-ary Tree
原文链接 [每日 LeetCode] 559. Maximum Depth of N-ary Tree Description: Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the ..
168
5 年前
[每日 LeetCode] 350. Intersection of Two Arrays II
原文链接 [链接] Description: Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Exampl ..
125
5 年前
[每日 LeetCode] 349. Intersection of Two Arrays
原文链接 [链接] Description: Given two arrays, write a function to compute their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2] Example ..
162
5 年前
[每日 LeetCode] 543. Diameter of Binary Tree
原文链接 [链接] Description: Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of thelonges ..
165
5 年前
[每日 LeetCode] 242. Valid Anagram
原文链接 [链接] Description: Given two strings s and t , write a function to determine if t is an anagram of s. Example 1: Input: s = 'anagram', t = 'nagaram' Output: ..
138
5 年前
[每日 LeetCode] 101. Symmetric Tree
原文链接 [链接] Description: Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4 ..
135
5 年前