摘要：1. 问题描述 Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example:Given num = 16, return true. Given num = 5, r 阅读全文

摘要：1. 问题描述 Given an integer, write a function to determine if it is a power of three.Follow up:Could you do it without using any loop / recursion?Tags: M 阅读全文

摘要：1. 问题描述 Given an integer, write a function to determine if it is a power of two.Tags: Math Bit ManipulationSimilar Problems: (E) Number of 1 Bits (E) 阅读全文

摘要：1. 问题描述 Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight). For example, the 阅读全文

摘要：1. 问题描述 Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. For exam 阅读全文

摘要：1. 问题描述 Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 阅读全文

摘要：1. 问题描述 Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally ide 阅读全文

摘要：1. 问题描述 Invert a binary tree. to Tag: Tree /** * Definition for a binary tree node. * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right 阅读全文

摘要：1. 问题描述 Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.You may assume t 阅读全文

摘要：1. 问题描述 Given two arrays, write a function to compute their intersection. Example: Note: Each element in the result must be unique.The result can be i 阅读全文

摘要：1. 问题描述 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 the far 阅读全文

摘要：1. 问题描述 Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.For example: Given num = 38, the process i 阅读全文

摘要：1. 问题描述 You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 t 阅读全文

摘要：1. 问题描述 Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.T 阅读全文

摘要：1. 问题描述 Given two numbers represented as strings, return multiplication of the numbers as a string.Note:The numbers can be arbitrarily large and are n 阅读全文

摘要：1. 问题描述 Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant di 阅读全文

摘要：1. 问题描述 Given two binary strings, return their sum (also a binary string). Tags: Math String 2. 解答思路 3. 代码 4. 反思 阅读全文

摘要：1. 问题描述 You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a 阅读全文

摘要：1. 问题描述 Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not se 阅读全文

摘要：1. 问题描述 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the ar 阅读全文