hackerrank vs leetcode

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode 027. Remove Element (Easy) link : Title: https://oj.leetcode.com/problems/remove-element/Code (GitHub): Https://github.com/illuz/leetcode : Deletes all numbers in an array whose value is Elem. Analysis : With two p

Leetcode question 7th:Given a 32-bit signed integer, reverse digits of an integer.Example 1:input:123321Example 2:Input: -123-321Example 3:input:12021Note:Assume we is dealing with a environment which could only store integers within the 32-bit signed integer range: [? 231, 231? 1]. For the purpose of this problem, assume a your function returns 0 when the reversed integer overflows.Problem Solving Ideas:if: x=1234,y=01) y times 10,x to remove the bot

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode009.palindrome_number (Easy)links：Title: https://oj.leetcode.com/problems/palindrome-number/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Determines whether a number is a palindrome number.Analysis：Just write as you want. You can first convert to a string and then judge. (This solut

Given a non-empty string s and a dictionary worddict containing a list of non-empty words, determine if s can be segmented to a space-separated sequence of one or more dictionary words.Note: The same word in the dictionary is reused multiple times in the segmentation. Assume the dictionary does not contain duplicate words. Example 1:input:s = "Leetcode", worddict = ["Leet", "code"]output:trueexplanation:return True because "

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode025. Reverse Nodes in K-group (hard)links：Title: https://oj.leetcode.com/problems/reverse-nodes-in-k-group/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：A list is divided into a group of each k, which is flipped within each group.You can use only a constant number of spaces.Analysis：This pro

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode026. Remove duplicates from Sorted Array (easy)links：Title: https://oj.leetcode.com/problems/remove-duplicates-from-sorted-array/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：To an ordered sequence, delete the repeating element.Analysis：If you can open an array to save it is very easy. But t

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode016.3sum_closest (Medium)links：Title: https://oj.leetcode.com/problems/3sum-closest/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Finds three numbers in a given sequence, making and closest to target.Analysis：With 015. 3Sum (Medium) is similar, even simpler.Or the first sort, and then left a

Leetcode (4) | | Longest palindromic Substring and manacher linear algorithmPrefaceThis article is the fifth question of Leetcode, did not think that the speed of doing these questions will be so slow, all of the work in this above, the only blame their basic poor. This article mainly describes the longest palindrome substring used to solve a string using the Manacher linear algorithm.Topics Given

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode027. Remove Element (Easy) link :Title: https://oj.leetcode.com/problems/remove-element/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions :Deletes all numbers in an array with a value of elem.Analysis :Use two pointers, one for the position to be placed, and one for the scan pointer.Because it's

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode022.generate_parentheses (Medium)links：Title: https://oj.leetcode.com/problems/generate-parentheses/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Produces all valid strings with n-brackets.Analysis： Using DFS can be done quickly, can add ' (' Add ' (', can add ') ' Add ') '. (The fo

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode023. Merge k Sorted Lists (Hard)links：Title: https://oj.leetcode.com/problems/merge-k-sorted-lists/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：and 021. Merge two Sorted Lists (easy) is similar, this time to merge K.Analysis：It is obvious that you can think of using the function of the comp

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode006.zigzag_conversion (Easy)links：Title: https://oj.leetcode.com/problems/zigzag-conversion/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Arranges a string in a line that is written in horizontal order.Analysis：Direct simulation on the line.Code: C + +:Class Solution {Public:string convert (

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode002.add_two_numbers (Medium)links：Title: https://oj.leetcode.com/problems/add-two-numbers/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：A new list that is generated by adding two lists.Analysis：Direct simulation is possible.Code：C++:Class Solution {public: listnode *addtwonumbers (ListNod

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode036. Valid Sudoku (Easy)links：Title: https://leetcode.com/problems/valid-sudoku/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Determine if a Sudoku is valid.Effective Sudoku is not forced to have a solution.Analysis：As long as there is no same number in the same row, column, block.Open the n

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode035. Search for a Range (Medium)links：Title: https://leetcode.com/problems/search-for-a-range/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Finds a range of numbers in an ordered array. (because the number is duplicated)Analysis：Or two-point search variants. (c + +) directly with C

Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode033. Search in rotated Sorted Array (hard)links：Title: https://leetcode.com/problems/search-in-rotated-sorted-array/Code (GitHub): Https://github.com/illuz/leetcodeTest Instructions：Find a number in an ordered array that has been rotated.For example 4 5 6 7 0 1 2 , a "rotated ordered array".Analysis：This is the

One leetcode a day . This series of articles has been uploaded to my Github, address: Zeecoder ' s GithubWelcome to my Sina Weibo Weibo, my Sina WeiboWelcome reprint, Reprint please indicate the source (i) topic Given an integer (Signed/bits), write a function to check whether it are a power of 4. Example:Given num =, return true. Given num = 5, return false. Follow up:could You solve it without loops/recursion? (ii) problem solving The main idea: to

of duplicates. Merge of 82 non-intersecting ordered linked listsIdea: The main study of the merge process, and the operation of the list, in the Leetcode summary of endless series of the sort of relevant examples Nine-link list rollover (including full flip, partial rollover, segmented flip) (recursive or non-recursive implementation)Idea: The flip process typically requires three node pointers: the tail node Subtail (the first node to be flipped, th

Candy There is N children standing in a line. Each child is assigned a rating value. You is giving candies to these children subjected to the following Requirements:each child must has at least one candy. Children with a higher rating get more candies than their neighbors. What's the minimum candies you must give? The key to this problem: or examining. Feel Leetcode topic examining are difficult not to judge clearly the topic to do, often very waste

above the "crest" (such as popping I to i+k, then all of these columns are taller than the height of i-1 and i+k+1), so if we use the thought solution of the "left and right extension looking column" before, with the height of these columns as the height of the entire rectangle, The left and right stretches of the rectangle contain columns that do not exceed this "crest" because the column heights outside the crest are lower than theirs. "Crest Map" is actually the "island" to solve the largest