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Python implementation of Leetcode Primary algorithm--string

Python implementation of Leetcode Primary algorithm--string# invert string def reversestring (s): Return s[::-1]# reverse number def reverse (x): if x Python implementation of the Leetcode primary algorithm--string

[C + +] leetcode:81 Triangle

Level:Minpath[I] = min(Minpath[I],Minpath[I+1]) + Triangle[k][I]; note here, since we are min (Minpath[i], minpath[i+1]), unlike the dynamic plan previously handled, [C + +] leetcode:56 Unique Paths. Here two values minpath[i", minpath[i+1] are not updated, that is, dp[i-1][j", dp[i-1][j+1], is the value of the next layer. Attention:1. When initializing, we use the value of the last line.Bottom-up initializes the DP vector2. Loop, we start fro

"Leetcode-array" 1, Sum

1 PrefaceThe reason for the beginning of the brush Leetcode algorithm problem, one is to face the autumn strokes, the 2nd is because the ability to improve their programming, in the blog to brush 5 or so on the algorithm of the problem, adhere to two months, hope Bo friends to supervise.This series intends to use C # and Java programming, why with two languages, because of the spring strokes, found that the company is in the C # is too few, only learn

(Java) Leetcode 334. Increasing Triplet subsequence--increment of ternary subsequence

Given an unsorted array return whether a increasing subsequence of length 3 exists or not in the array.Formally the function should: Return True if there exists I, J, K such that Arr[i] arr[j] arr[k] given 0≤ i J k ≤ n-1 else return false. Your algorithm should run in O (n) time complexity and O (1) space complexity.Examples:Given [1, 2, 3, 4, 5] ,Return true .Given [5, 4, 3, 2, 1] ,Return false .This problem and Leetcode

Java for Leetcode 081 Search in rotated Sorted Array II

Follow to "Search in rotated Sorted Array":What if duplicates is allowed?Would this affect the run-time complexity? How and why?Write a function to determine if a given the target was in the array.Problem Solving Ideas:Refer to Java for Leetcode 033 Search in rotated Sorted Array to modify the following code, Java implementation is as follows: public boolean search (int[] nums, int target) {int left = 0, right = Nums.length-1;while (left Java for

Java for Leetcode 059 Spiral Matrix II

Given an integer n, generate a square matrix filled with elements from 1 to n2 in Spiral order.For example,Given N = 3 ,You should return the following matrix:[[1, 2, 3],[8, 9, 4],[7, 6, 5]]Problem Solving Ideas:Refer to Java for Leetcode 054 Spiral Matrix, modify the following code, Java implementation is as follows:static public int[][] Generatematrix (int n) { if (n==0) return new int[0][0]; Int[][] Matrix=new int[n][n]; int

Intersection of two arrays II [LeetCode-350]

Original title address: https://leetcode-cn.com/problems/intersection-of-two-arrays-ii/description/given two arrays, write a method to calculate their intersection.For example:Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2, 2].Attention: The number of occurrences of each element in the output should coincide with the number of occurrences of the element in two arrays. We can not consider the order of the output results. Follow

Leetcode-java (updated daily)

Description: Choose Java, heavy in the experience, performance is not optimal. Welcome reprint: http://www.ming-yue.cn/leetcode-java-solutions/.First give a leetcode already have the answer, why come up directly to answer, because this many answers written are very concise, not too easy to understand, or suggest to do their own first, the answer is only reference http://www.ninechapter.com/solutions/.1,http

Java for Leetcode 117 populating Next right pointers in each Node II

Follow up to Problem "populating Next right pointersin each Node".What if the given tree could is any binary tree? Would your previous solution still work?Note: Constant extra space. For example,Given The following binary tree, 1 / 2 3 /\ 4 5 7After calling your function, the tree is should look like: 1, NULL / 2, 3, null /\ 4-> 5, 7, NULLProblem solving idea One:The difficulty of the subject is that it needs t

Java for Leetcode 108 Convert Sorted Array to Binary Search Tree

Given an array where elements is sorted in ascending order, convert it to a height balanced BST.Problem Solving Ideas:First of all to understand, what is called height balanced BST Java for Leetcode balanced Binary Tree, then it is very easy, Java implementation is as follows:Public TreeNode Sortedarraytobst (int[] nums) {return Sortedarraytobst (nums, 0, nums.length-1);} static public TreeNode Sortedarraytobst (int[] nums, int begin, int end) {if (be

[Leetcode-java] Binary Tree inorder Traversal

Topic:Given a binary tree, return the inorder traversal of its nodes ' values.For example:Given binary Tree {1,#,2,3} , 1 2 / 3Return [1,3,2] .Train of thought: In the topic, the rule uses the loop instead of the recursive solution, uses the auxiliary stack to store the traversed node, if not empty then the stack, otherwise the stack assigns the value, and points to its right node.Code: Public classSolution { PublicListinordertraversal (TreeNode root) {ListNewArraylist(); if(Root

"Leetcode" Merge intervals to sort by comparator

Topic link Merge Intervals/** * Definition for an interval. * public class Interval {* int start; * int end; * Interval () {start = 0; end = 0;} * Interval (int s, I NT e) {start = s; end = e;} * Title: Leetcode The 56th merge intervals interval merges the set of the given interval, merging the overlapping parts of the adjacent intervals * idea: Now the set of this interval is sorted from large to small, After traversing if the end of the current coll

[Leetcode] Maximum Product subarray @ python

[Leetcode] Latest added:2014-09-23Find the contiguous subarray within an array (containing at least one number) which have the largest product.For example, given the array [2,3,-2,4] ,The contiguous Subarray has the [2,3] largest product = 6 .Trick: Save Min value and max value since the max value is related with extrem value and current valueclass Solution: # @param A, a list of integers # @return an integer def maxproduct (Self, A):

[Leetcode] Validate Binary Search tree (check if it is a two-fork find) Python

Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows: The left subtree of a node contains only nodes with keys less than the node ' s key. The right subtree of a node contains only nodes with keys greater than the node ' s key. Both the left and right subtrees must also is binary search trees. Leetcode has given the definition of a two-fork search tree.classSolution:#@param r

Leetcode Algorithm Practice PlusOne

See today Cool Shell recommended foreign Programming leetcode Algorithmic Programming web site , there are currently 154 algorithms, the feeling is very interesting, ordinary work is also relatively busy, now very little time to exercise algorithm related things, there is a time to calm down the heart, review the foundation, active under the idea of self, is also necessary. in the afternoon, I did a simple question, and then we added some other questi

"Leetcode" Reorder List JAVA

I. Description of the topicGiven a singly linked list l: l0→l1→ ... →ln-1→lN,Reorder it to: l0→ln→l1→ln-1→l2→L n-2→ ...You must does this in-place without altering the nodes ' values.For example,Given {1,2,3,4} , reorder it to {1,4,2,3} .Second, analysis1. Violence solutionThe time required for this solution is relatively high in complexity, O (N2)  The code is as follows: the code submitted on Leetcode will prompt for timeouts Public voidreorderlist

Tree-related issues on Leetcode

Preface I did not expect that the junior still heavy schoolwork, coupled with some trivial, and their own inertia, many plans are not enough heart, but do not want to go on like this, recently reviewed his skills in the learning algorithm tree points, found that some of the basic algorithms and classical algorithms are really so little swallowed, So there is a brush Leetcode plan, one is to Restudying, the second is to familiarize yourself with Java

"Leetcode" Single Number Problem solving report (Java & Python) __leetcode

"Leetcode" single Number Problem solving report (Java Python) [Leetcode] Https://leetcode.com/problems/single-number/Total accepted:183838 Total submissions:348610 difficulty:easy Question Given an array of integers, every element appears twice for one. Find is single one.Note:Your algorithm should have a linear runtime. Could you implement it without using extra memory? Ways I was too weak, the problem

Leetcode Analysis _85. Maximal Rectangle

"title" Topic linkGiven a 2D binary matrix filled with 0 "s and 1 ' s, find the largest rectangle containing only 1 's and return their area. For example, given the following matrix: 1 0 1 0 01 0 1 1 11 1 1 1 11 0 0 1 0 Return 6 "Analysis" RuntimeAt first I think it can be a dynamic planning idea, such as: MATRIX[I-1][J-1]–>MATRIX[I][J] orMATRIX[I-1][J-1],MATRIX[I-1][J],MATRIX[I][J-1]–>MATRIX[I][J] After several thoughts and practice, it seems that it is not going through(Note: But this kind of

[Leetcode/javascript] 461.Hamming Distance__java

[Leetcode/javascript] 461.Hamming Distance Topic The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calculate the Hamming distance. Note:0≤x, y Example: input:x = 1, y = 4 Output:2 Explanation:1 (0 0 0 1)4 (0 1 0 0)? ? The above arrows point to positions where the corresponding bits are different. Analysis The topic is very simple, given two 32-bit integers

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