Minimum Adjacent Swaps to Reach the Kth Smallest Number, 1851. Find All Numbers Disappeared in an Array, 452. Programs. Maintain the first stack for odd level and second stack for even level. level Check if a Parentheses String Can Be Valid, 2117. Circular Permutation in Binary Representation, 1239. The Users That Are Eligible for Discount, 2231. Count the Number of Consistent Strings, 1685. Data Structures \u0026 Algorithms made Easy in Java - N. Karumanchi: https://amzn.to/2U0qZgY6. Maximize Sum Of Array After K Negations, 1007. Auxiliary Space: O(H) , where h is the height of the tree. Design Add and Search Words Data Structure, 235. Alert Using Same Key-Card Three or More Times in a One Hour Period, 1605. Minimize Result by Adding Parentheses to Expression, 2234. Least Number of Unique Integers after K Removals, 1482. Explanation - Minimum Obstacle Removal to Reach Corner, 2292. Firstly we insert the root into the queue and iterate over the queue until the queue is empty. Given an integer K and queue Q of integers. In this post we will solve this problem with Queue, aka We will use BFS (breadth first search) technique to solve this. If left to right is false we need to reverse the array and push it in our data structure or else, simply push it in our data structure. Minimum Operations to Make a Uni-Value Grid, 2035. Lexicographically Smallest Equivalent String, 1072. Populating Next Right Pointers in Each Node II, 153. Thanks for contributing an answer to Stack Overflow! Add 7 incorrectly to level 3. ZigZag Tree Traversal - GeeksforGeeks Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit, 1439. Push and pop in different ways depending on if the level is odd or level is even. array in the end of the Maximum Points in an Archery Competition, 2213. Asking for help, clarification, or responding to other answers. Maximum Total Beauty of the Gardens, 2237. Minimum Amount of Time to Collect Garbage, 2393. The array elements in the resultant array must be such that arr[0] >= arr[1] <= arr[2] >= arr[3] <= arr[4] and so on. Construct Smallest Number From DI String, 2378. Add Two Polynomials Represented as Linked Lists, 1637. Maximum Fruits Harvested After at Most K Steps, 2107. Difficulty: Substrings That Begin and End With the Same Letter, 2084. If you also wish to share your knowledge with the takeUforward fam,please check out this article, (adsbygoogle=window.adsbygoogle||[]).push({}), The best place to learn data structures, algorithms, most asked, Copyright 2023 takeuforward | All rights reserved, Minimise Maximum Distance between Gas Stations. Note that the optimization of this approach is the approach where we used deque. Time Complexity: O(N)Auxiliary Space: O(N) for deque data structure. Iterative Post Order Binary tree Traversal, Flatten Binary Tree in Level Order Traversal. Binary Tree Zigzag Level Order Traversal LeetCode Solution - TutorialCup Longest Subsequence With Limited Sum, 2391. Your task is to complete the function zigZagTraversal() which takes the root node of the Binary Tree as its input and returns a list containing the node values as they appear in the Zig-Zag Level-Order Traversal of the Tree. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The future of collective knowledge sharing, Also, i have used maps, which does not allow storing of NULL values (or keys) which is one of the problems. Maximum Difference by Remapping a Digit, 2567. Can Make Arithmetic Progression From Sequence, 1503. Maximum Number of Jumps to Reach the Last Index, 2771. Maximum Enemy Forts That Can Be Captured, 2515. Count Elements With Strictly Smaller and Greater Elements, 2150. In this approach, we do a level order traversal but not in the same direction for every level. Minimize the Total Price of the Trips, 2654. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts, 1466. k==1 level==3 Can't recurse left or right. Count Strictly Increasing Subarrays, 2398. Minimum Moves to Make Array Complementary, 1676. Maximum Side Length of a Square with Sum Less than or Equal to Threshold, 1293. The required output is - 4 2 1 7 5 3 8 9 6 . Abbreviating the Product of a Range, 2120. Find Customers With Positive Revenue this Year, 1823. A variable is also required to get the information about the current level order (whether the traversal is right to left or left to right). Partition Array Such That Maximum Difference Is K, 2300. Replace Non-Coprime Numbers in Array, 2200. Rearrange Characters to Make Target String, 2290. Max Difference You Can Get From Changing an Integer, 1433. Maximum Number of Integers to Choose From a Range I, 2556. Binary Tree Zigzag Level Order Traversal - LeetCode The Time When the Network Becomes Idle, 2040. Letter Combinations of a Phone Number, 28. Has these Umbrian words been really found written in Umbrian epichoric alphabet? Longest ZigZag Path in a Binary Tree, 1374. Cracking the Coding Interview Paperback: https://amzn.to/3aSSe3Q3. Coordinate With Maximum Network Quality, 1621. On performing an inorder traversal using the map, we obtain the required mapping. Maximum Number of People That Can Be Caught in Tag, 1996. You will be notified via email once the article is available for improvement. Minimum Moves to Reach Target with Rotations, 1213. Let's see the implementation of the zigzag traversal of using stack and queue. Sci fi story where a woman demonstrating a knife with a safety feature cuts herself when the safety is turned off. Minimum Difference Between Highest and Lowest of K Scores, 1985. Number of Ways to Reach a Position After Exactly k Steps, 2406. Object Oriented Programming in Java. Flip Binary Tree To Match Preorder Traversal, 982. Find Kth Largest XOR Coordinate Value, 1741. Number of Distinct Substrings in a String, 1699. Binary Tree Zigzag Level Order Traversal,#CodingInterview #LeetCode #JulyLeetCodingChallenge #Google #Amazon #BinaryTree #Zigzag Maximum Number of Groups With Increasing Length, 2791. Examples: String Transforms Into Another String, 1155. Pseudo-Palindromic Paths in a Binary Tree, 1458. Level Order Traversal Using Queue. Step 2. To learn more, see our tips on writing great answers. Execution of All Suffix Instructions Staying in a Grid, 2121. This article is being improved by another user right now. Since a stack is a LIFO(Last-In-First_out) structure, next time when nodes are popped off nextlevel, it will be in the reverse order. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . Construct the Lexicographically Largest Valid Sequence, 1719. Treat the first stack as the currentLevel stack and the second stack as the nextLevel stack. Replace Employee ID With The Unique Identifier, 1379. Partition String Into Substrings With Values at Most K, 2524. Minimum Operations to Make the Array Alternating, 2171. Paths in Matrix Whose Sum Is Divisible by K, 2436. Shortest Subarray to be Removed to Make Array Sorted, 1576. Find centralized, trusted content and collaborate around the technologies you use most. Another Approach: In this approach, use a deque to solve the problem. Array With Elements Not Equal to Average of Neighbors, 1969. We will print the nodes of the first level (20), then we will print nodes of second level (10,30) and at last we will print nodes of the last level . (i.e, from left to right, then right to left for the next level and alternate between). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Find the Zig-Zag Level Order Traversal of the Binary Tree. Number of Burgers with No Waste of Ingredients, 1277. Choose Edges to Maximize Score in a Tree, 2379. Longest Subarray of 1's After Deleting One Element, 1495. Difference Between Ones and Zeros in Row and Column, 2486. We know that a stack works on a Last In First Out (LIFO) principle. Sum of Mutated Array Closest to Target, 1304. Count Odd Numbers in an Interval Range, 1525. Number Of Rectangles That Can Form The Largest Square, 1727. LeetCode: Binary Tree Level Order Traversal C# Can anybody help me? Check Distances Between Same Letters, 2400. Special Array With X Elements Greater Than or Equal X, 1611. Count Number of Special Subsequences, 1956. Form Largest Integer With Digits That Add up to Target, 1450. Minimum Moves to Reach Target Score, 2141. Count Subarrays With Score Less Than K, 2307. Zigzag Conversion 7. Distribute Money to Maximum Children, 2593. Find Minimum Time to Finish All Jobs, 1724. Subsequence of Size K With the Largest Even Sum, 2099. What is Mathematica's equivalent to Maple's collect with distributed option? Maximum Number of Points From Grid Queries, 2504. Convert Integer to the Sum of Two No-Zero Integers, 1318. Longest Common Subsequence Between Sorted Arrays, 1941. Maximum XOR With an Element From Array, 1712. Number of Unequal Triplets in Array, 2476. Split Two Strings to Make Palindrome, 1617. 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Preview of Search and Question-Asking Powered by GenAI, C++ design question on traversing binary trees, print level order traversal of binary tree in Zigzag manner. res In every iteration, you have nodes of one level in one of the stacks. Friend Requests II: Who Has the Most Friends, 615. Minimum Number of Operations to Reinitialize a Permutation, 1807. ZigZag Traversal of Binary Tree - Coding Ninjas Maximum Product of the Length of Two Palindromic Subsequences, 2003. Contribute to the GeeksforGeeks community and help create better learning resources for all. Pairs of Songs With Total Durations Divisible by 60, 1011. Capacity To Ship Packages Within D Days, 1013. Minimum Number of Arrows to Burst Balloons, 453. Split a String Into the Max Number of Unique Substrings, 1594. current stores all the nodes in the current level in an order (left to right or right to left). Why do code answers tend to be given in Python when no language is specified in the prompt? Minimum Score Triangulation of Polygon, 1047. Check if Array Is Sorted and Rotated, 1758. Longest Path With Different Adjacent Characters, 2247. Let's see the implementation of the zigzag traversal of a binary tree using two stacks. Unique Substrings in Wraparound String, 497. Lowest Common Ancestor of a Binary Search Tree, 236. Partition Array into Disjoint Intervals, 921. Maximum Non Negative Product in a Matrix, 1595. Find Minimum Time to Finish All Jobs II, 2328. So, We could create a Customer Placing the Largest Number of Orders, 597. You are given a Binary Tree, and the task is to print the Bottom-left to Upward-right Traversal of the given Binary Tree, i.e., the level order traversal having level as Bottom-left to Upward-right node. Count Nodes Equal to Sum of Descendants, 1974. The Most Frequently Ordered Products for Each Customer, 1597. Count Number of Possible Root Nodes, 2584. Reduction Operations to Make the Array Elements Equal, 1888. (video)Level order traversal in spiral form, Another approach: Depth-First Search(DFS), Follow the steps below to implement the above idea:-, Below is the implementation of the above approach:-. Evaluate the Bracket Pairs of a String, 1812. Find Words That Can Be Formed by Characters, 1163. Sum of Imbalance Numbers of All Subarrays, 2764. is Array a Preorder of Some Binary Tree, 2767. This process goes on till the current and next stacks are not empty. Maximum Product of the Length of Two Palindromic Substrings, 1961. The counter variable is unnecessary. Check If a Word Occurs As a Prefix of Any Word in a Sentence, 1456. As we traverse nodes in the queue, we need to push them in a temporary array. Maximum Number of Vowels in a Substring of Given Length, 1457. Count Number of Distinct Integers After Reverse Operations, 2446. 's to Avoid Consecutive Repeating Characters, 1577. Let's see the implementation of the zigzag traversal of a binary tree using a deque. Java Python3 Javascript C# #include <bits/stdc++.h> struct Node { int data; struct Node *left, *right; }; struct Node* newNode (int data) { struct Node* node = new struct Node; node->data = data; node->left = node->right = NULL; return (node); } void levelOrder (struct Node* root, int n) { struct Node* queue [2 * n]; int top = -1; How Many Apples Can You Put into the Basket, 1198. Number of Times a Driver Was a Passenger, 2240. Find The Original Array of Prefix Xor, 2434. Ways to Split Array Into Good Subarrays, 2752. Number of Smooth Descent Periods of a Stock, 2111. Today, let's learn about a famous and commonly asked Interview Problem, i.e., the ZigZag Traversal of a Binary Tree.. Minimum White Tiles After Covering With Carpets, 2210. Count Number of Maximum Bitwise-OR Subsets, 2045. Given a Binary Tree. We use a Hashmap data structure. Note that each approach is very important from the interview point of view. Minimum Moves to Equal Array Elements II, 467. Minimum Insertions to Balance a Parentheses String, 1546. Minimum Operations to Reduce an Integer to 0, 2572. Redistribute Characters to Make All Strings Equal, 1898. Minimum Possible Integer After at Most K Adjacent Swaps On Digits, 1509. The Number of the Smallest Unoccupied Chair, 1944. Minimum Distance to Type a Word Using Two Fingers, 1326. What mathematical topics are important for succeeding in an undergrad PDE course? Start from the root node. Largest Number After Digit Swaps by Parity, 2232. Minimum Time to Collect All Apples in a Tree, 1449. Examples: Input: K = 1 1 / \ 2 3 / \ / 4 9 8 Output: 1 3 2 4 9 8 Greatest English Letter in Upper and Lower Case, 2311. To learn more, see our tips on writing great answers. Find Minimum in Rotated Sorted Array, 154. Longest Substring with At Most Two Distinct Characters, 181. Example 1: For the below binary tree the zigzag order traversal will be 1 3 2 7 6 5 4. Difference Between Element Sum and Digit Sum of an Array, 2538. https://neetcode.io/ - A better way to prepare for Coding InterviewsSolving Leetcode 103 - Binary Tree Zigzag Level Order Traversal, today's daily leetcod. Data Structures and Algorithms Made Easy - N. Karumanchi: https://amzn.to/2U8FrDt5. But I am stuck at one type of test cases, i.e., when the tree is not balanced. Number of Different Integers in a String, 1806. Please mail your requirement at [emailprotected]. Minimum Non-Zero Product of the Array Elements, 1972. Find the Subtasks That Did Not Execute, 1769. Maximum Length of Subarray With Positive Product, 1568. I can't figure out my mistake. Minimum Operations to Make Numbers Non-positive, 2710. Binary Tree Zigzag Level Order Traversal - Leetcode 103 - Python k==0 level==2 You add 6 correctly to level 2. We eventually return the array list keep. Longest Substring Without Repeating Characters, 17. rev2023.7.27.43548. Repeat until your reach the final level. Maximum Number of Groups Entering a Competition, 2359. Given a binary tree, write a program to return the average value of the nodes on each level in the form of an array. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find Three Consecutive Integers That Sum to a Given Number, 2178. Sort the Students by Their Kth Score, 2546. Find the Width of Columns of a Grid, 2640. Let's see the implementation of the zigzag traversal of a binary tree using recursion. Construct Binary Tree from Preorder and Inorder Traversal, 106. Given two binary search trees with root nodes as tree1 and tree2 of size n and m, write a program to return an array of integers that contains all the elements of tree1 and tree2 in non-decreasing order. Your task is to complete the function zigZagTraversal () which takes the root node of the Binary Tree as its input and returns a list containing the node values as they appear in the Zig-Zag Level-Order Traversal of the Tree. Find the Smallest Divisor Given a Threshold, 1284. class Solution: def zigzagLevelOrder(self, root: TreeNode) -> List[List[int]]: if not root: return [] # Initialize the queue with the root node queue = [root] # Initialize the flag to indicate the direction of the zigzag traversal is_left_to_right = True # Initialize the result list result = [] while queue: # Initialize the current level list le. Given the root of a binary tree, return the level order traversal of its nodes' values. Clone Binary Tree With Random Pointer, 1489. Time Complexity: For the above program, the time complexity is O(n), where n represents the total number of nodes present in the binary tree. Maximal Score After Applying K Operations, 2531. Design a Stack With Increment Operation, 1385. A better idea for ZigZag Level Order Traversal is the Breadth-First Approach that we use in a Level Order Traversal. Substring with Concatenation of All Words, 34. Longest Even Odd Subarray With Threshold, 2763. Sum of Absolute Differences in a Sorted Array, 1687. We also need to keep the left to right bool variable that keeps check of the current level we are in. Amount of Time for Binary Tree to Be Infected, 2388. All the Pairs With the Maximum Number of Common Followers, 1953. Reconstruct Original Digits from English, 424. (ie, from left to right, then right to left for the next level and alternate between). Shortest Distance from All Buildings, 323. Binary tree from in-order and level-order traversals? Employees Earning More Than Their Managers, 211. Longest Substring with At Most K Distinct Characters, 363. If you will think about the problem, you will realize that this problem is basically a preorder or postorder traversal with the only difference that for each level, the traversal toggles between left to right and right to left. Maximum Alternating Subsequence Sum, 1913. Check if an Original String Exists Given Two Encoded Strings, 2061. Check for Contradictions in Equations, 2309. Minimum Additions to Make Valid String, 2646. Binary Tree Zigzag Level Order Traversal with step by step - LeetCode insert root into current and begin BFS traversal. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Max Dot Product of Two Subsequences, 1460. Find Score of an Array After Marking All Elements, 2598. Minimize Rounding Error to Meet Target, 1059. Number of Ways to Reorder Array to Get Same BST, 1574. Create Target Array in the Given Order, 1391. Binary Tree Zigzag Level Order Traversal - LeetCode Find Elements in a Contaminated Binary Tree, 1263. Contribute your expertise and make a difference in the GeeksforGeeks portal. Check If Array Pairs Are Divisible by k, 1498. Number of Ways to Wear Different Hats to Each Other, 1437. Lowest Common Ancestor of a Binary Tree III, 1653. Convert Callback Based Function to Promise Based Function, 2779. Why we are iterating in the inner for loop till the size of the queue? Users That Actively Request Confirmation Messages, 1940. Longest Substring Without Repeating Characters 4. Find Smallest Common Element in All Rows, 1203. Largest Component Size by Common Factor, 967. Largest Positive Integer That Exists With Its Negative, 2442. If a particular level (as key-value) is not present in the map, insert that level (as key) into the map and map it to an empty dynamic. If the level is even, then we will add the root value in the Number of Strings That Appear as Substrings in Word, 1968. Maximum Profit of Operating a Centennial Wheel, 1601. Note that the value of the variable changes after the completion of the traversal of each level. In this article, we present 4 different approaches for Zig Zag Traversal of Binary Tree using stack, deque, recursion and an iterative approach. Count Hills and Valleys in an Array, 2212. Number of Times Binary String Is Prefix-Aligned, 1376. In your recursive call, use the level of this node in the tree as an argument. Count Substrings That Differ by One Character, 1639. Count Ways to Group Overlapping Ranges, 2581. Check if There is a Path With Equal Number of 0's And 1's, 2511. 103. Binary Tree Zigzag Level Order Traversal - Medium Approach: The above idea, could be implemented with a queue. Longest Substring of One Repeating Character, 2216. Second Minimum Time to Reach Destination, 2046. 6 Answers Sorted by: 18 Yes. Maximize Palindrome Length From Subsequences, 1775. Check If String Is Transformable With Substring Sort Operations, 1589. Determine the Winner of a Bowling Game, 2661. Length of the Longest Alphabetical Continuous Substring, 2419. The important point to take care of is to decide whether the pop operation is performed from the front side or from the rear side. Length of Longest Fibonacci Subsequence, 889. . Problem Statement: Given the root of a binary tree, return the zigzag level order traversal of Binary Tree. Introduction. Numbers With Same Consecutive Differences, 971. Remove All Occurrences of a Substring, 1911. All rights reserved. Binary Tree Zigzag Level Order Traversal - LeetCode Solutions Preface Style Guide Problems Problems 1. First Day Where You Have Been in All the Rooms, 1999. Longest Palindrome by Concatenating Two Letter Words, 2133. Minimum Number of Increments on Subarrays to Form a Target Array, 1533. The Journey of an Electromagnetic Wave Exiting a Router, I seek a SF short story where the husband created a time machine which could only go back to one place & time but the wife was delighted, Heat capacity of (ideal) gases at constant pressure. Largest Color Value in a Directed Graph, 1864. Algebraically why must a single square root be done on all terms rather than individually? Given a binary tree, return the zigzag level order traversal of its nodes' values. Smallest Rectangle Enclosing Black Pixels, 309. The Number of Passengers in Each Bus I, 2143. Thank you for your valuable feedback! @banarun Is there a way that does this in O(1) extra space? Check If Word Is Valid After Substitutions, 1005. k==0 level==2 You add 6 correctly to level 2. Binary Tree Level Order Traversal - LeetCode First and Last Call On the Same Day, 1973. Data Structure & Algorithm Classes (Live), Data Structure & Algorithm-Self Paced(C++/JAVA), Full Stack Development with React & Node JS(Live), Top 100 DSA Interview Questions Topic-wise, Top 20 Interview Questions on Greedy Algorithms, Top 20 Interview Questions on Dynamic Programming, Top 50 Problems on Dynamic Programming (DP), Commonly Asked Data Structure Interview Questions, Top 20 Puzzles Commonly Asked During SDE Interviews, Top 10 System Design Interview Questions and Answers, Indian Economic Development Complete Guide, Business Studies - Paper 2019 Code (66-2-1), GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam, Level order traversal in spiral form | Using one stack and one queue, Level order traversal with direction change after every two levels, Construct Complete Binary Tree from its Linked List Representation, Check whether a given binary tree is perfect or not, Number of siblings of a given Node in n-ary Tree, Find sum of all left leaves in a given Binary Tree, Construct a special tree from given preorder traversal, Zig Zag Level order traversal of a tree using single array, Construct BST from given preorder traversal using Stack, Minimum number of bracket reversals needed to make an expression balanced, Construct BST from its given level order traversal, SequenceMatcher in Python for Longest Common Substring. Display Table of Food Orders in a Restaurant, 1420. Minimum Operations to Make All Array Elements Equal, 2605. Minimum Number of Taps to Open to Water a Garden, 1327. Number of Trusted Contacts of a Customer, 1365. Swap For Longest Repeated Character Substring, 1157. Reorder Routes to Make All Paths Lead to the City Zero, 1467. For each level, you need just a List<int> level, add the elements of the level to this list, and then add this list to res.. By eliminating this variable, you also eliminate any concerns about the correctness of res[counter].Add(temp.val);.With the code changed to level.Add(temp.val), the mental burden is reduced. Count Unreachable Pairs of Nodes in an Undirected Graph, 2320. Minimum Difference Between Largest and Smallest Value in Three Moves, 1519. Check if All the Integers in a Range Are Covered, 1894. Lowest Common Ancestor of a Binary Tree IV, 1680. Random Point in Non-overlapping Rectangles, 524. next stores all the nodes of the next level in an order opposite to current. I think this approach is going to be difficult to get to the correct solution. Percentage of Users Attended a Contest, 1634. Once a visited nodes value has been added to, If the entire level of nodes has been visited, add the level list to the final result list. Insufficient Nodes in Root to Leaf Paths, 1081. Learn To Code in C/C++. Kids With the Greatest Number of Candies, 1432. Removing Minimum Number of Magic Beans, 2174. The node structure passed to your function will be. The k-th Lexicographical String of All Happy Strings of Length n, 1418. Number of Steps to Reduce a Number to Zero, 1343. Minimum Subsequence in Non-Increasing Order, 1404. Tiling a Rectangle with the Fewest Squares, 1247. Longest Subsequence Repeated k Times, 2015. Maximize Number of Subsequences in a String, 2208. Thank you for your valuable feedback!

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