leetcode 70. Climbing Stairs
Dynamic programming optimal substructure: to the n layer, boundary conditions can be obtained by the sum of n-2 layer and n-1 layer methods: n <=3...
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Tag: leetcode
“Stack/dictionary” leetcode 20. Valid parentheses
December 11, 2023
by Robert Taylor
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Given a string s containing only '(', ')', '{', '}', '[', ']', check whether the string is valid. A valid string requires
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A daily leetcode141- Circular linked list
December 11, 2023
by Ryan Hodson
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2018.11.8 punch card tomorrow's topic: https://leetcode-cn.com/problems/remove-nth-node-from-end-of-list/ Topic details topic details use two
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19. Symmetric binary Tree (101)
December 11, 2023
by Patrick Wilson
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Given a binary tree, check whether it is mirror - symmetric. For example, binary trees [1,2,2,3,4,4,3] are symmetric.
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203. Remove linked list elements
December 11, 2023
by Neelofar Roy
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If you are given a head Node and an integer val, delete all nodes in the list where node. val == val and return the...
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LeetCode 1342. Number of operations to change a number to 0
December 11, 2023
by Shayak Krishnan
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Given a non-negative integer num, return the number of steps required to get it to 0. If the current number is even, you divide it...
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Leetcode Daily problem series – Print in order
December 11, 2023
by Pamela Howell
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We provide a class in which three different threads will share an instance of Foo. Please design modification procedures to ensure that the two() method...
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63. Different paths II, Dynamic programming, JavaScript, detailed comments
December 11, 2023
by Kiara Jani
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At any point in the grid, there are two ways to go right and two ways to go down. It also comes from the top...
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Leetcode 221. Maximal Square (Python)
December 11, 2023
by James Brown
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Leetcode 221. Maximal Square (Python) This is a typical dynamic plan
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【LeetCode 233. Number of 1’s 】
December 11, 2023
by Badal Kashyap
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This is the 24th day of my participation in the August Text Challenge. Check out the details: August Text Challenge LeetCode 233. Given an integer...
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Leetcode-1365- How many numbers are smaller than the current number
December 11, 2023
by Devansh Subramaniam
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Given an array nums, for each element nums[I], count all the numbers in the array smaller than it. In other words, for each nums[I] you...
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105 Construct binary tree by traversing sequence of preorder and middle order
December 11, 2023
by Joshua Robinson
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1, 题目 2, idea of front order traversal: root left and right order traversal: left root right do not quite understand how to write the...
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7. Integer inversion
December 11, 2023
by 程詩涵
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7. Integer inversion description 🌊 gives you a 32-bit signed integer x and returns the result of reversing the numeric portion of x. If the...
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[algorithm | LeetCode] array series
December 11, 2023
by Melissa Jenkins
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Description: Description: Example 1: Example 2: Hint: 0 <= nums.length
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344. Reverse the string
December 11, 2023
by Danielle Bowman
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```js /** * @param {character[]} s * @return {void} Do not return anything, modify s in-place instea
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[Li Guo brush inscribed 12] — “Integer to Roman numerals”
December 11, 2023
by Alice Murdoch-Nielsen
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Offer to come, dig friends take it! I am participating in the 2022 Spring Recruit Punch card activity. Click here for details. Roman numerals contain...
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Sword refers to offer two daily topic | 07/09
December 10, 2023
by Kathy Owens
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Today's topic is the 7th and 9th questions of the sword offer, rebuild the binary tree and implement the queue execution mode using two stacks,...
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Leetcode.125 validates palindrome strings
December 10, 2023
by Julie Paton
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Given a string, verify whether it is a palindrome string. Only alphanumeric characters are considered. Note: In this case, we define an empty string as...
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LeetCode 1828. Count the number of midpoints in a circle
December 10, 2023
by Gregory Harris
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Points [I] = [xi, yi] represents the coordinates of the ith point on a two-dimensional plane. Multiple points might have the same coordinates. Also give...
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17.14. The minimum number of K
December 10, 2023
by Saksham Bumb
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They design an algorithm to find the smallest k number in an array. You can return these k numbers in any order. Example: 0 <=...
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380. O(1) time to insert, delete, and retrieve random elements
December 10, 2023
by Ira Sandal
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Make writing a habit together! This is the 11th day of my participation in the "Gold Digging Day New Plan · April More text Challenge"....
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LeetCode small white front brush problem record
December 10, 2023
by Craig Monk
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7. Integer reversal idea: use the REVERSE method of JS array or manual reverse order value interval: use the Match. Pow function to get the...
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Leetcode 518. Change for II and 525. Continuous array
December 10, 2023
by 李家瑋
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This is the 10th day of my participation in the challenge. For details, check out the challenge question: Give coins of different denominations and a...
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LeetCode – 1122. Relative sorting of arrays
December 10, 2023
by Edward Copeland
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Leetcode-1122. Relative sorting of arrays Sorts the elements in ARR1 so that the relative order of items in ARR1 is the same as the relative...
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LeetCode Series – Binary Tree Traversal (BFS)
December 10, 2023
by Kiaan Bir
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The sequential traversal of binary trees generally adopts the iterative method, which has a fixed idea. The basic idea is as follows: With queue (first-in,...
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Weekly Leetcode: 1217, 55, 62, 121, 279
December 10, 2023
by Cynthia Norton
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The five lines of Leetcode of the week are: 1217 play chips 55 jump game 62 Different paths 121 Best time to buy and sell...
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[LeetCode series 1. The sum of two numbers] | brush problem punch
December 10, 2023
by Mannat Mane
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To participate in an activity of swiping questions in the Nuggets community, simply speaking, it is to publish 10 articles about algorithm and swiping questions...
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Graph theory BFS simulation
December 10, 2023
by Joyce Khan
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This is the 27th day of my participation in the Challenge. This is 909 on LeetCode. Snakes and Ladders, medium difficulty. Tag: "graph theory BFS"...
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“String” leetcode 13. Roman numeral to integer (simple)
December 10, 2023
by William Turner
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The Roman numeral contains the following seven characters: I, V, X, L, C, D, and M. For example, the Roman numeral 2 is written as...
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Algorithm problem daily a practice — 76 days: ugly number L
December 10, 2023
by Dr. Damien Jones
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Attractive numbers are positive integers with only prime factors 2, 3 and 5. I give you an integer n and ask you to decide whether...
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