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转载 133. Clone Graph

问题描述：Givena reference of a node in aconnectedundirected graph, return adeep copy(clone) of the graph. Each node in the graph contains a val (int) and a list (List[Node]) of its neighbors....

2019-09-27 04:44:00 235

转载 973. K Closest Points to Origin

问题描述：We have a list ofpointson the plane. Find theKclosest points to the origin(0, 0).(Here, the distance between two points on a plane is the Euclidean distance.)You may return the a...

2019-09-26 11:21:00 272

转载 238. Product of Array Except Self

问题描述：Given an arraynumsofnintegers wheren> 1, return an arrayoutputsuch thatoutput[i]is equal to the product of all the elements ofnumsexceptnums[i].Example:Input: [1,2,3,...

2019-09-26 11:02:00 230

转载 953. Verifying an Alien Dictionary

问题描述：　　In an alien language, surprisingly they also use english lowercase letters, but possiblyin a differentorder. Theorderof the alphabetis some permutationof lowercase letters.Give...

2019-09-26 10:35:00 162

转载 9. Palindrome Number

问题描述：Determine whether an integer is a palindrome. An integerisapalindrome when itreads the same backward as forward.Example 1:Input: 121Output: trueExample 2:Input: -121Outpu...

2019-07-29 13:09:00 112

转载 3. Longest Substring Without Repeating Characters

问题描述：Given a string, find the length of thelongest substringwithout repeating characters.Example 1:Input: "abcabcbb"Output: 3 Explanation: The answer is "abc", with the length of 3. ...

2019-07-23 12:59:00 103

转载 399. Evaluate Division

问题描述：Equations are given in the formatA / B = k, whereAandBare variables represented as strings, andkis a real number (floating point number). Given some queries, return the answers. If t...

2019-04-18 12:22:00 123

转载 712. Minimum ASCII Delete Sum for Two Strings

问题描述：Given two stringss1, s2, find the lowest ASCII sum of deleted characters to make two strings equal.Example 1:Input: s1 = "sea", s2 = "eat"Output: 231Explanation: Deleting "s" from...

2018-08-24 07:48:00 126

转载 845. Longest Mountain in Array

问题描述：845.Longest Mountain in ArrayDescriptionHintsSubmissionsDiscussSolutionPick OneLet's call any (contiguous) subarray B (of A)amounta...

2018-08-24 07:17:00 123

转载 815. Bus Routes

问题描述：We have a list of bus routes. Eachroutes[i]is a bus route that the i-th busrepeats forever. For example ifroutes[0] = [1, 5, 7], this means that the firstbus (0-th indexed) travels in...

2018-08-24 06:14:00 151

转载 204. Count Primes

问题描述：Count the number of prime numbers less than a non-negative number,n.Example:Input: 10Output: 4Explanation: There are 4 prime numbers less than 10, they are 2, 3, 5, 7.解题思路：...

2018-08-16 09:33:00 86

转载 190. Reverse Bits

问题描述：Reverse bits of a given 32 bits unsigned integer.Example:Input: 43261596Output: 964176192Explanation: 43261596 represented in binary as 00000010100101000001111010011100, ...

2018-08-16 09:21:00 109

转载 154. Find Minimum in Rotated Sorted Array II

问题描述：Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.(i.e., [0,1,2,4,5,6,7]might become [4,5,6,7,0,1,2]).Find the minimum element.The ...

2018-08-16 08:59:00 100

转载 165. Compare Version Numbers

问题描述：Compare two version numbersversion1andversion2.Ifversion1>version2return1;ifversion1<version2return-1;otherwise return0.You may assume that the version strings are n...

2018-08-16 08:29:00 100

转载 187. Repeated DNA Sequences

问题描述：All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to identify repeated sequences within t...

2018-08-16 08:06:00 110

转载 698. Partition to K Equal Sum Subsets

问题描述：Given an array of integersnumsand a positive integerk, find whether it's possible to divide this array intoknon-empty subsets whose sums are all equal.Example 1:Input: nums = [4, ...

2018-08-16 06:51:00 105

转载 445. Add Two Numbers II

问题描述：You are given twonon-emptylinked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contain a single digit. Add the two number...

2018-08-11 07:40:00 102

转载 582. Kill Process

问题描述：Givennprocesses, each process has a uniquePID (process id)and itsPPID (parent process id).Each process only has one parent process, but may have one or more children processes. This...

2018-08-11 07:15:00 122

转载 [转载][C++]拷贝构造函数和赋值运算符

原文地址：C++ 拷贝构造函数和赋值运算符----------------正文------------------------------------本文主要介绍了拷贝构造函数和赋值运算符的区别，以及在什么时候调用拷贝构造函数、什么情况下调用赋值运算符。最后，简单的分析了下深拷贝和浅拷贝的问题。拷贝构造函数和赋值运算符在默认情况下（用户没有定义，但是也没有显式的删除），编...

2018-08-10 03:39:00 65

转载 74. Search a 2D Matrix

问题描述：Write an efficient algorithm that searches for a value in anmxnmatrix. This matrix has the following properties:Integers in each row are sorted from left to right.The first i...

2018-08-10 02:05:00 62

转载 129. Sum Root to Leaf Numbers

问题描述：Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number.An example is the root-to-leaf path1->2->3which represents the number123.F...

2018-08-10 01:09:00 99

转载 199. Binary Tree Right Side View

问题描述：Given a binary tree, imagine yourself standing on therightside of it, return the values of the nodes you can see ordered from top to bottom.Example:Input:[1,2,3,null,5,null,4]Outp...

2018-08-10 00:43:00 97

转载 831. Masking Personal Information

问题描述：We are given apersonal information stringS, which may representeitheran email addressora phone number.We would like to mask thispersonal information according to thefollowing rul...

2018-08-07 05:15:00 161

转载 516. Longest Palindromic Subsequence

问题描述：Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000.Example 1:Input:"bbbab"Output:4One possible long...

2018-08-05 13:51:00 64

转载 251. Flatten 2D Vector

问题描述：Implement an iterator to flatten a 2d vector.Example:Input: 2d vector =[ [1,2], [3], [4,5,6]]Output: [1,2,3,4,5,6]Explanation:By calling next repeatedly until hasNext...

2018-08-05 12:59:00 84

转载 140. Word Break II

问题描述：Given anon-emptystringsand a dictionarywordDictcontaining a list ofnon-emptywords, add spaces insto construct a sentence where each word is a valid dictionary word.Return all su...

2018-08-04 12:22:00 56

转载 296. Best Meeting Point

问题描述：A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 marks the home of someone in the group. The dista...

2018-08-04 08:06:00 83

转载 450. Delete Node in a BST

问题描述：Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the BST.Basically, the deletion can be...

2018-08-04 07:11:00 66

转载 290. Word Pattern

问题描述：Given apatternand a stringstr, find ifstrfollows the same pattern.Herefollowmeans a full match, such that there is a bijection between a letter inpatternand anon-emptyword in...

2018-08-03 08:26:00 59

转载 266. Palindrome Permutation

问题描述：Given a string, determine if a permutation of the string could form a palindrome.Example 1:Input: "code"Output: falseExample 2:Input: "aab"Output: trueExample 3:Input: "car...

2018-08-03 07:32:00 78

转载 186. Reverse Words in a String II

问题描述：Given an input string, reverse the string word by word.Example:Input: ["t","h","e"," ","s","k","y"," ","i","s"," ","b","l","u","e"]Output: ["b","l","u","e"," ","i","s"," ","s"...

2018-08-03 07:24:00 146

转载 648. Replace Words

问题描述：In English, we have a concept calledroot, which can be followed by some other words to form another longer word - let's call this wordsuccessor. For example, the rootan, followed byoth...

2018-08-03 06:59:00 78

转载 203. Remove Linked List Elements

问题描述：Remove all elements from a linked list of integers that have valueval.Example:Input: 1->2->6->3->4->5->6, val = 6Output: 1->2->3->4->5解题思路：需要注意...

2018-07-31 06:27:00 59

转载 442. Find All Duplicates in an Array

问题描述：Given an array of integers, 1 ≤ a[i] ≤n(n= size of array), some elements appeartwiceand others appearonce.Find all the elements that appeartwicein this array.Could you do it wi...

2018-07-31 06:19:00 64

转载 807. Max Increase to Keep City Skyline

问题描述：In a 2 dimensional arraygrid, each valuegrid[i][j]represents the height of a building located there. We are allowed to increase the height of any number of buildings, by any amount (the...

2018-07-31 05:31:00 77

转载 433. Minimum Genetic Mutation

问题描述：A gene string can be represented by an 8-character long string, with choices from"A","C","G","T".Suppose we need to investigate about a mutation (mutation from "start" to "end"), whe...

2018-07-31 05:08:00 82

转载 205. Isomorphic Strings

问题描述：Given two stringssandt, determine if they are isomorphic.Two strings are isomorphic if the characters inscan be replaced to gett.All occurrences of a character must be replaced w...

2018-07-31 04:38:00 63

转载 457. Circular Array Loop

问题描述：You are given an array of positive and negative integers. If a number n at an index is positive, then move forward n steps. Conversely, if it's negative (-n), move backward n steps. Assume...

2018-07-31 02:47:00 67

转载 735. Asteroid Collision

问题描述：We are given an arrayasteroidsof integers representing asteroids in a row.For each asteroid, the absolute value represents its size, and the sign represents its direction (positive mea...

2018-07-31 02:00:00 101

转载 722. Remove Comments

问题描述：Given a C++ program, remove comments from it. The programsourceis an array wheresource[i]is thei-th line of the source code. This represents the result of splitting the original sou...

2018-07-31 01:20:00 82

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