LeetCode solution: 200. Number of islands, DFS, JavaScript, detailed comments
If we have a grid[I][j] === '1', then we start moving the grid up, down, left, and right. As long as the grid is 1,...
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Tag: leetcode
Vernacular recursion 2 — the recursion thought summed up by the binary tree force deduction
January 26, 2024
by 馬雅惠
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Recently in brush force buckle binary tree related problems, found that many problems need to be solved by recursion, or many problems solved by recursion...
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Sword finger Offer 24. Reverse the linked list
January 26, 2024
by 朱志偉
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Define a function that takes the head node of a linked list, reverses the list, and outputs the head node of the reversed list. Define...
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Moving average in leETCODE_346 data stream
January 26, 2024
by Craig Monk
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Given an integer data stream and a window size, the moving average of all integers is calculated according to the size of the sliding window....
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Sword finger offer 24. Reverse the linked list
January 26, 2024
by James Berg
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Define a function that takes the head node of a linked list, reverses the list, and outputs the head node of the reversed list. Example:...
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Parenthesis matching: A legal parenthesis matching sequence
January 26, 2024
by Tamara Foster
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Each sequence of legal parentheses can be generated by the above rules. Iterate backwards from the first character, hitting '(',count+1, otherwise count-1. Save with Max,...
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Sort arrays by parity
January 26, 2024
by Miraya Brahmbhatt
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Easy questions. I have something to do tonight, so LET's start with one. Double pointer, traversal exchange can be. Next time, change the topic into...
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Card 8: maximum depth of binary tree, sequence traversal of binary tree, sequence traversal of binary tree II
January 26, 2024
by Emma Freeth-Stewart
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The maximum depth of the binary tree, layer by layer after traversing, the first thought is the while loop, but in the process of writing,...
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LeetCode Advanced 206- Reverse Linked List (Huawei Interview questions)
January 26, 2024
by Dr. Natasha Whittaker
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This article introduces the basic knowledge of linked list structure, single linked list inversion. This knowledge point is also often used by companies as a...
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LeetCode Exploration (7) : 387_ First unique character in a string
January 26, 2024
by Janet Lord
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In data structure and algorithm, stack and queue are good brothers. Stack mechanism is last in, first out, can be understood as a cup, the...
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One algorithm of the day — Leetcode 200– Number of islands — Python
January 26, 2024
by Gina Mann
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Two-dimensional depth-first search problem requires a Visited array to indicate whether each node has been visited. All nodes are detected, but only a depth-first search...
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LeetCode – LRU caching in practice
January 26, 2024
by Cynthia Smith
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Recently, there is a very popular interview related project on Github, which has entered the front page of Trending in just a few days. The...
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LeetCode: A pair swap list of nodes (LeetCode 24)
January 26, 2024
by Brittany Hampton
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Today is the 19th issue, strive for a daily issue, at most two days, welcome everyone to supervise me... The initial initialization process creates a...
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LeetCode Advanced – Egg one
January 26, 2024
by Jasmine Simmons
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As for "Easter eggs," the bloggers try to bury Easter eggs in every blog post in the series on data structures and algorithms, if possible....
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Print the linked list from end to end
January 26, 2024
by Scott Faulkner
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Enter the head node of a linked list and return the value of each node from end to end (as an array). Enter the head...
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Longest valid parenthesis | brush question punch
January 26, 2024
by Alexandra Owens
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Nuggets team number online, help you Offer impromptu! Given a string containing only '(' and ')', find the longest valid (well-formed and continuous) parenthesis substring....
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LeetCode20. Valid parentheses. The story of finding a mate
January 26, 2024
by Christina Gutierrez
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This is the 14th day of my participation in the Last Revision Challenge of November 2021. The last Revision Challenge of 2021 @TOC topic Information...
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LeetCode Advanced 1029- Greedy
January 26, 2024
by Anvi Garg
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In my last blog post, LeetCode Advanced 944- Greedy, a friend suggested that 944 is not very representative of understanding greedy algorithms. After reviewing the...
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Find the maximum value in each tree line, DFS, JavaScript, detailed comments
January 26, 2024
by Anita Nelson
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DFS traverses all nodes of binary tree with recursion. Before you start recursing, you have to think about what you need to do if the...
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34. Find the first and last position of an element in a sorted array
January 26, 2024
by Todd Wright
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Small knowledge, big challenge! This article is participating in the creation activity of "Essential Tips for Programmers". Given an array of integers in ascending order,...
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LeetCode Advanced – Practice speed pointer (Ali interview questions)
January 26, 2024
by Christine Ross
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The use of the speed pointer often appears in the interview questions of various companies, although the form of the question is different but the...
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LeetCode: Sword refers to Offer 24. Reverse the list
January 26, 2024
by Cheryl Harrison-White
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Define a function that takes the head node of a linked list, reverses the list, and outputs the head node of the reversed list. Copyright...
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The minimum depth of a binary tree traversal
January 26, 2024
by Jiya Choudhary
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Given a binary tree, you need to find the depth from the root to the nearest leaf. DFS (Recursive traversal) with queue simulation hierarchy traversal...
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Leetcode_413 arithmetic division
January 26, 2024
by Kiaan Bir
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If a sequence has at least three elements and any two adjacent elements have the same difference, the number is said to be in an...
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Leetcode 1130. Minimum Cost Tree From Leaf Values (python)
January 26, 2024
by 劉中山
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Leetcode 1130. Minimum Cost Tree From Leaf Values (python
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Leetcode 382. Linked List Random Node (Python)
January 26, 2024
by Karen Simmonds
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Given a singly linked list, return a random node's value from the linked list. Each node must have the same probability of being chosen. According...
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Leetcode_406 recreates the queue based on height
January 26, 2024
by 朱惠婷
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Suppose you have an out-of-order group of people standing in a queue, and the array people represents the attributes of some of the people in...
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My JS algorithm pit crawl – finds the first and last positions of elements in a sorted array
January 26, 2024
by Stephen Shepard
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Find the first and last positions of elements in the sorted array: https://leetcode-cn.com/problems/find-first-and-last-position-o
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LeetCode Advanced 339- Depth-First Search (DFS)
January 26, 2024
by Barbara Gonzalez
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The depth-first Search algorithm (DFS) is an algorithm used to traverse or Search a tree or graph. Traverse the nodes of the tree as deep...
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20. Valid parentheses | brush questions to punch out
January 26, 2024
by 黃婷婷
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Given a only include a '(',') ', '{','} ', '/', ' 'the string s, determine whether a string is effective. An open parenthesis must be...
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