[Day20201027] Binary tree traversal (difficulty: middle) – Day20201027
Given a binary tree, return its prior traversal.
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Tag: leetcode
LeetCode11 – containers of most water | practice series algorithm
December 10, 2023
by Stephen Smith
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This is the 25th day of my participating in the August More text challenge, Activity details: August more Text Challenge Preample Today comes an interesting...
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Day 75: Nim games
December 10, 2023
by Annette Holland
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Two people play Nim together: there is a pile of rocks on the table, and you take turns playing your own rounds, with you as...
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23. Merge K ascending lists
December 10, 2023
by 秦婷婷
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You are given an array of linked lists, each of which has been sorted in ascending order. Please merge all lists into one ascending list...
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Finger Offer 68-i. The most recent common ancestor of the binary search tree
December 10, 2023
by Tracy Cooper
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Given a binary search tree, find the nearest common ancestor of two specified nodes in the tree. The definition of the nearest common ancestor in...
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Front end Leetcode series | 14. Longest public prefix
December 10, 2023
by Linda Benson
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The longest common prefix is the longest common prefix. Write a function to find the longest public prefix in an array of strings. Such as
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13. Convert Roman numerals to whole numbers
December 10, 2023
by Jennifer Mitchell
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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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Talk about the best opportunity to buy and sell stocks | punch brush
December 10, 2023
by Keith Johns
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Given an array prices, its ith element prices[I] represents the price of a given stock on day I. You can only buy the stock on...
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Week 287: Player who has lost zero or one match
December 10, 2023
by Prisha Kapadia
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Matches [I] = [Winneri, loseri] indicates that Winneri defeated Loseri in a match.
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Gold three silver four Java interview I go to explore the way ahead
December 10, 2023
by Dr. Angela Moran
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7.LRU cache data structure implementation, Leetcode original title, but STL provisions can only use map, other all their own implementation. (write for a long time,...
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Leetcode — string
December 10, 2023
by Megan Davis
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Given two strings s and t, write a function to determine whether t is an alphabetic allotopic of S. That is, to determine whether two...
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A binary tree is constructed from middle-order and post-order traversal sequences
December 9, 2023
by Garrett Marks
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You are given the middle and last traversal sequences of a binary tree. You build the binary tree based on these two sequences. Assume that...
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“String” leetcode 9. Check whether it is palindrome (simple)
December 9, 2023
by Seth Harvey
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9. You are given an integer x. If x is a palindrome integer, return true; Otherwise, return false. Palindromes are integers that read in positive...
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Leetcode 225. Implement Stack Using Queues (Python)
December 9, 2023
by Callum Hussain
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Leetcode 225. Implement Stack Using Queues (Python)
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12. Convert whole numbers to Roman numerals
December 9, 2023
by Alison Perez
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Integers are converted to Roman numerals. For example, the Roman numeral 2 is written as II, which is a juxtaposed 1. Write XII as X...
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LeetCode (Issue 35)
December 9, 2023
by Craig Patchett
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LeetCode brushes the questions regularly, with 10 questions in each period. Comrades with heavy business can look at the ideas I share, which are not...
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4. Find the median of two positive ordinal groups
December 9, 2023
by 潘宜君
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Given two positive ordered (from small to large) arrays of size m and n, nums1 and nums2, respectively. Please find and return the median of...
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LeetCode Find the Highest Altitude (Kotlin)
December 9, 2023
by Madison Johnson
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Method: A technique for investigating the paper list is described by gain, and then a maximum value is selected. If you have any questions, please...
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LeetCode Weekly contest 288 problem-solving collection
December 9, 2023
by Patricia Taylor
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Hello, I'm Liang Tang. Today is Monday, as usual, let's watch the LeetCode game yesterday morning. This competition is organized by Airwallex, which is a...
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LeetCode – #64 Minimum path sum (Top 100)
December 9, 2023
by Steven Smith
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Our community will continue to consider Yi Gu (Netflix growth hacker, author of "The Way to Interview for iOS")
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Offer 40. Minimum number of k
December 9, 2023
by Phillip Carter
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40. The minimum number of offers is k. I am participating in the 2022 Spring Recruit Punch card activity. Click here for details. 1. 📑...
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Tree traversal using preorder and middle order traversal sequence to construct a binary tree
December 9, 2023
by Lance Stevenson
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You are given the preceding and middle traversal sequences of a binary tree. You build the binary tree based on these two sequences. Assume that...
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LeetCode 572: Subtree of another tree
December 9, 2023
by Jocelyn Morris
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Given two non-empty binary trees S and T, test whether S contains subtrees with the same structure and node values as T. A subtree of...
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Basic Principles of iOS 03: Category: Associated Objects
December 9, 2023
by Andrew Wheeler
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Category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t: category_t
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Force buckle brush problem 👊 [263. Ugly number]
December 9, 2023
by Margaret Bryant
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This is the 13th day of my participation in the August Text Challenge. If you are given an integer n, determine whether n is an...
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Perfect for | LeetCode brush notes
December 9, 2023
by Dr. Guy Harrison
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This is the 23rd day for me to participate in the August More text challenge. The activity details are as following: August more text challenge...
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LeetCode 1877. The minimum sum of the largest pairs in an array
December 9, 2023
by Hannah Morgan
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The sum of the number pairs of a and b is equal to a plus b. The maximum pair sum is the largest pair sum...
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The first positive number missing
December 9, 2023
by Joanna Andrew
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This is the 28th day of my participation in the August Text Challenge. In the August Text Challenge, you are given an array of unsorted...
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There are duplicate elements
December 9, 2023
by 丁怡安
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Give you an integer array nums. Returns true if any value appears in the array at least twice; Return false if each element in the...
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LeetCode HOT 100 3. The oldest string without repeating characters
December 9, 2023
by Natalie Hale
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Sliding window is a string or an array of common kind of abstract concepts, the window is in an array or string of the starting...
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