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% Easy 110 Balanced Binary Tree 37.2% Easy 108 Convert Sorted Array to Binary Search Tree 41.8% Easy 107 Binary Tree level Order traversal II 39.6% Easy 104 Maximum Depth of Binary Tree 52.3% Easy 101 Symmetric Tree 38.4% Easy 100 Same Tree 46.2% Easy Leetcode algori
[LeetCode from zero to single row] No19.RemoveNthNodeFromEndofList, leetcodeThis is a simple application of a linked list. Delete the nth node from the end. Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end, the linked list becomes 1->2->3->5. Note:Given n will always be valid.Try to do this in one pass.Code /** *
[LeetCode from zero to single row] No67.AddBinary, leetcodeQuestion Given two binary strings, return their sum (also a binary string ). For example,A ="11"B ="1"Return"100".Code public class Solution { public String addBinary(String a, String b) { String lon= a.length()-b.length()>=0 ? a:b; String sho= a.length()-b.length()Code download: https://github.com/jimenbian/GarvinLeetCode /******************************** * This article is
Given a sorted integer array where the range of elements is [lower, upper] inclusive, return its missing ranges.For example, given [0, 1, 3, 2,--], lower = 0 and upper =, return ["", "4->49", "51->74", "76->99"].Thinking Analysis: This problem is basically to investigate the application of double pointers, starting from lower-1, traversing the nums array to find missing range, you can use the pre and cur a previous two pointer movement implementation. Note Lower and upper processing, lower can b
Search for a range Search for upper and lower bounds-Leetcode, range-leetcodeThe original question is as follows: Given a sorted array of integers, find the starting and ending position of a given target value. Your algorithm's runtime complexity must be in the orderO(LogN). If the target is not found in the array, return[-1, -1]. For example,Given[5, 7, 7, 8, 8, 10]And target value 8,Return[3, 4]. The idea is as follows: It is obvious that this is a
LeetCode Intersection of Two Linked Lists solution report, leetcodeHttps://oj.leetcode.com/problems/intersection-of-two-linked-lists/Calculate the first public node of the two linked lists. If there is no public node, null is returned. A: a1 → a2 c1 → c2 → c3 B: b1 → b2 → b3 Solution: 1) if the last node of the two linked lists is the same, the two linked lists must have
[LeetCode from zero to single row] No21.MergeTwoSortedLists, leetcodeThis topic is a simple application of the linked list. It combines two ordered linked lists into an ordered linked list. The idea is: Table 1 and Table 2 take two objects respectively, pointing to current and next for cross-comparison sorting. Merge two sorted linked lists and return it as a new list. The new list shoshould be made by splicing together the nodes of the first two list
(Daily algorithm) LeetCode, algorithm) LeetCodeSearch in Rotated Sorted Array I II LeetcodePerform binary search for ordered arrays (the following uses a non-decreasing array as an example ): int binarySort(int A[], int lo, int hi, int target) { while(lo { int mid = lo + (hi - lo)/2; if(A[mid] == target) return mid; if(A[mid] lo = mid + 1; else hi =
Some time ago to participate in the interview, the interviewer began to let me do a problem, he read, let me answer the question of time complexity and optimization, then I understand what is the complexity of time, but do not know how to calculate, a start on the wrong, and then did not then, Once I visited the blog park when I saw a blogger's article said that there is leetcode this thing, so I know the leetco
Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode 031. Next permutation (Medium) link : Title: https://oj.leetcode.com/problems/next-permutation/Code (GitHub): Https://github.com/illuz/leetcode : Find the next permutation of a sequence. Analysis : You can use the STL
Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode 039. Combination Sum (Medium) link : Title: https://leetcode.com/problems/combination-sum/Code (GitHub): Https://github.com/illuz/leetcode : Give a set of positive integers, and a target number, select some number fro
Index: [Leetcode] leetcode key index (C++/JAVA/PYTHON/SQL)Github:https://github.com/illuz/leetcode 036. Valid Sudoku (Easy) link : Title: https://leetcode.com/problems/valid-sudoku/Code (GitHub): Https://github.com/illuz/leetcode : Determine whether a Sudoku is effective.Effective Sudoku is not forced to have soluti
"The total directory of Bowen >>>" Leetcode algorithm title Leetcode is a very useful site to prepare for the interview, is very worthwhile to go to the place, which are some of the classic face questions, these topics in the Google,microsoft,facebook,yahoo and other large Internet companies interview questions have appeared, and the topic is divided into easy, Difficult third, but also according to the t
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
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