The Best leetcode tutorial and blogs for Beginners and Experts at Moment For Technology

Given a binary tree for the last text challenge in 2021, return its sequential traversal. First introduce the traversal rules of binary trees: binary trees...

The front end

Removes duplicate elements from sorted linked lists

January 30, 2024

by Gillian Patterson

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A list is required to exist in ascending order. Pass in the head node of the list, head, and remove all duplicate elements so that...

The front end

Delete duplicate element II from sorted linked list

January 30, 2024

by 黃淑華

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The first node in the list is head. Delete all the nodes in the list that have duplicate numbers, and keep only the numbers that...

The back-end

1705. Maximum number of apples to eat: Greedy use of the classic priority queue

January 30, 2024

by Michele Bennett

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This is 1705 in LeetCode. The maximum number of apples to eat is moderate. There was a special apple tree that produced several apples each...

The front end

[luffy]_leetcode-230- The KTH smallest element in the binary search tree

January 30, 2024

by Dr. Sam Smith

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Given the root node of a binary search tree, root, and an integer k, design an algorithm to find the KTH smallest element (counting from...

The front end

[Luffy]_leetcode- Interview question 04.05- Legal binary search tree

January 30, 2024

by Miss Elaine Powell

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Implement a function to check whether a binary tree is a binary search tree. Example 1: Example 2: Properties of binary search trees: For any...

The back-end

Leetcode 235. Lowest Common Ancestor of a Binary Search Tree (Python)

January 30, 2024

by Asher Harris

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Leetcode 235. Lowest Common Ancestor of a Binary Search Tree (Python) using two DFS solutions

The front end

[Luffy]_leetcode-1801- Total number of orders in backlog

January 30, 2024

by James Klein

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Orders [I] = [pricei, amounti, orderTypei] [pricei, amounti, orderTypei] [pricei, amounti, orderTypei] [pricei, amounti, orderTypei

The back-end

686. Repeated String Matching: “Card” & “Upper and Lower Bound Properties” & “KMP” & “String Hash”

January 30, 2024

by Keith Lopez

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This is 686 on LeetCode. Repeat string matching with medium difficulty. Tag: "string hash", "KMP" Given two strings A and B, find the minimum number...

The front end

My JS algorithm climb pit tour – larger grouped position

January 30, 2024

by Penelope McManaway

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Day ninety: power button 830, the location of the larger group address: https://leetcode-cn.com/problems/positions-of-large-groups/ : double pointer, a traverse; But pay attention to 'a '

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leetcode 2096.Step-By-Step Directions From a Binary Tree Node to Another(python)

January 30, 2024

by Melissa Hunter

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Leetcode 2096. Step-by-step Directions From a Binary Tree Node to Another(Python) DFS

The front end

662. The maximum width of a binary tree

January 30, 2024

by Amber Hampton

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Given a binary tree, write a function to get the maximum width of the tree. The width of the tree is the maximum width of...

The back-end

Serialization and deserialization of binary trees

January 30, 2024

by Michael Mcclain

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Some time ago, my good friend Helen Lovass interviewed for the job of Senior Android development engineer. By byte convention, the stroking algorithm won't get...

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Binary tree serialization and deserialization (Solution 2)

January 29, 2024

by Ashley Perry-Small

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Binary tree serialization and deserialization, I use BFS (breadth-first traversal) method to do. In fact, friends also use BFS for job interviews. As you can...

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Merges the parenthesis sequence of entry nodes in the middle of two ordered arrays && linked lists

January 29, 2024

by Amelia Jackson

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NC22 merge two ordered array items link 1, 解决方法 : double pointer method, but this double pointer needs to be taken from...

ios

Open source LeetCode iOS client written by Swift

January 29, 2024

by 張雅惠

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It has iterated more than ten versions with perfect functions

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419. Warships on deck: Several “scan restrictions” & “space restrictions” practices

January 29, 2024

by Anna Raymond

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This is 419 on LeetCode. Battleship on deck. Difficulty is medium. You are given a $m x n$matrix $board$representing the deck, where each cell can...

The back-end

Validation of binary search tree (recursive + middle order traversal, Java implementation, upper and lower bounds detailed diagram)

January 29, 2024

by Seher Andra

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Mid-order traversal to determine whether the current node is greater than the previous node in mid-order traversal. If so, BST is satisfied and the traversal...

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[Luffy]_leetcode-215- The KTH largest element in the array

January 29, 2024

by Ms. Sheila Price

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Given an array of integers nums and k, return the KTH largest element in the array. Note that you need to find the KTH largest...

ios

Algorithm exercise – Merge two ordered linked lists

January 29, 2024

by Craig Patchett

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Merges two ordered lists into a new ordered list and returns. A new list is formed by concatenating all the nodes of a given two...

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Schedule III: Classic Greedy Use

January 29, 2024

by Dr. Charlie Black

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This is schedule 630 on LeetCode III. The difficulty is difficult. There are $N $different online courses, numbered from $1$to $n$. Give you an array...

The code of life

Leetcode 1720. Decode XORed Array (Python)

January 29, 2024

by Darren Hodgson

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Decode XORed Array (Python

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1610. Maximum number of visible points: Polar Angle geometry problem

January 29, 2024

by Reece Iqbal

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This is 1610 on LeetCode. The maximum number of visible points is difficult. Tag: "math", "geometry", "sort", "double pointer", "sliding window" give you a set...

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103. Serrated Sequence Traversal of binary trees (Daily Problem 2020.12.22)

January 29, 2024

by 羅雅萍

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Given a binary tree, return a zigzag sequence traversal of its node values. (that is, the next layer is traversed from left to right, then...

The front end

Leetcode:203. Remove linked list elements

January 29, 2024

by Kaia Cole-Brown

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Val == val delete all nodes in the list where node. val == val and return the new head Node.

The front end

Algorithm: binary tree sequence traversal

January 29, 2024

by Lauren Short

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In the previous several articles, I summarized the solutions of the recursive and iterative ways of the pre-order traversal, middle-order traversal and post-order traversal of...

The back-end

These problems can even be solved using breadth-first search

January 29, 2024

by 余家瑋

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The first one is to minimize the number of perfect squares that make up the sum. Be reasonable according to my previous understanding, this problem...

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318. Maximum Word length product: Simple bit operation simulation

January 29, 2024

by Tania Kennedy

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"This is the 17th day of my participation in the Gwen Challenge in November. See details of the event: The Last Gwen Challenge in 2021"....