binary tree zigzag level order traversal

Form Largest Integer With Digits That Add up to Target, 1450. Spiral/Zigzag level order traversal of binary tree in java Minimum Number of Operations to Move All Balls to Each Box, 1770. The algorithm i used is simple and is just a small variation of level order traversal. Difference Between Element Sum and Digit Sum of an Array, 2538. Minimum Replacements to Sort the Array, 2369. Insufficient Nodes in Root to Leaf Paths, 1081. Clone Binary Tree With Random Pointer, 1489. Finding the Number of Visible Mountains, 2350. Count Unique Characters of All Substrings of a Given String, 862. Make Costs of Paths Equal in a Binary Tree, 2682. The direction in which the traversal is going on will be determined by a variable whose value toggles between 0 and 1. Psuedocode for spiral level order traversal of a binary tree. Find K-Length Substrings With No Repeated Characters, 1101. Disconnect Path in a Binary Matrix by at Most One Flip, 2557. Another Approach: In this approach, use a deque to solve the problem. Check if Every Row and Column Contains All Numbers, 2134. Count Unreachable Pairs of Nodes in an Undirected Graph, 2320. Minimum Increment to Make Array Unique, 947. Convert Binary Number in a Linked List to Integer, 1292. String Transforms Into Another String, 1155. Path In Zigzag Labelled Binary Tree, 1111. Count the Number of Beautiful Subarrays, 2591. Parallel Execution of Promises for Individual Results Retrieval. Connect and share knowledge within a single location that is structured and easy to search. All Divisions With the Highest Score of a Binary Array, 2156. Enhance the article with your expertise. Words Within Two Edits of Dictionary, 2455. Execute Asynchronous Functions in Parallel, 2730. The Category of Each Member in the Store, 2052. 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. Minimum Score of a Path Between Two Cities, 2493. Find the Punishment Number of an Integer, 2701. For printing the nodes at the current level lvl we make a recursive call starting from the root of the binary tree . Find Minimum Time to Finish All Jobs, 1724. How does this compare to other highly-active people in recorded history? Lowest Common Ancestor of Deepest Leaves, 1129. Find Cumulative Salary of an Employee, 581. Get Biggest Three Rhombus Sums in a Grid, 1880. Find the Maximum Number of Marked Indices, 2577. . Remove Colored Pieces if Both Neighbors are the Same Color, 2039. Maximum Number of Integers to Choose From a Range I, 2556. Minimum Number of K Consecutive Bit Flips, 1003. Count Nodes Equal to Sum of Descendants, 1974. Two Furthest Houses With Different Colors, 2083. 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. Number Of Rectangles That Can Form The Largest Square, 1727. Flatten a Multilevel Doubly Linked List, 440. Construct Binary Tree from Preorder and Postorder Traversal, 893. 103. Binary Tree Zigzag Level Order Traversal - Medium Binary Tree Zigzag Level Order Traversal - LeetCode Sample tree : 1-(2-(4,5),3-(5,6)) Lexicographically Smallest Equivalent String, 1072. Find the Kth Smallest Sum of a Matrix With Sorted Rows, 1441. Subscribe JavaTpoint offers too many high quality services. Remove All Ones With Row and Column Flips, 2131. Find the Most Competitive Subsequence, 1674. Binary Tree Zigzag Level Order Traversal Medium 9.7K 250 Companies Given the root of a binary tree, return the zigzag level order traversal of its nodes' values. Maximum Number of Books You Can Take, 2356. Compare Strings by Frequency of the Smallest Character, 1171. Minimum Adjacent Swaps to Reach the Kth Smallest Number, 1851. Not the answer you're looking for? Therefore, the next time when nodes are popped off from the nextlevel stack, the order of traversal will be reversed. This problem is another common coding question asked in interviews. People Whose List of Favorite Companies Is Not a Subset of Another List, 1453. Remove Duplicates From an Unsorted Linked List, 1838. Maximum Number of Vowels in a Substring of Given Length, 1457. Maximum Non Negative Product in a Matrix, 1595. Length of the Longest Valid Substring, 2783. Minimum Add to Make Parentheses Valid, 945. Flip Columns For Maximum Number of Equal Rows, 1074. On performing an inorder traversal using the map, we obtain the required mapping. Leftmost Column with at Least a One, 1430. Sell Diminishing-Valued Colored Balls, 1649. 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). Get the Second Most Recent Activity, 1371. 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. Split the Array to Make Coprime Products, 2586. Let's call each vector in your zigzag vector a level. Count Equal and Divisible Pairs in an Array, 2177. Print Immutable Linked List in Reverse, 1269. Minimum Deletions to Make String Balanced, 1658. Sort Items by Groups Respecting Dependencies, 1209. while stack is not NULL Do following Create a empty stack called tempStack. Number of Dice Rolls With Target Sum, 1156. 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. Check If a String Contains All Binary Codes of Size K, 1464. (i.e., from left to right, then right to left for the next level and alternate between). Number of Substrings With Fixed Ratio, 2491. Maximum Number of Achievable Transfer Requests, 1602. The zigzag traversal of a binary tree can also be achieved using a deque. Maximum Fruits Harvested After at Most K Steps, 2107. Time Complexity: O(N) where N is number of nodesAuxiliary Space: O(N). Distance to a Cycle in Undirected Graph, 2205. 1 0. Thanks :), New! Number of Accounts That Did Not Stream, 2023. Unique Substrings in Wraparound String, 497. Binary Searchable Numbers in an Unsorted Array, 1967. Maximum Bags With Full Capacity of Rocks, 2280. Longest Word in Dictionary through Deleting, 549. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Why we are iterating in the inner for loop till the size of the queue? Lexicographically Smallest Palindrome, 2698. Number of Nodes in the Sub-Tree With the Same Label, 1520. How do you understand the kWh that the power company charges you for? Minimum Sum of Four Digit Number After Splitting Digits, 2161. Longest Substring with At Least K Repeating Characters, 421. Zigzag Binary Tree Traversal - Coding Ninjas Maximum Candies You Can Get from Boxes, 1299. 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; Connect and share knowledge within a single location that is structured and easy to search. Maximum Number of Groups Getting Fresh Donuts, 1819. Your code actually appears to work with your provided test case. Find the Start and End Number of Continuous Ranges, 1287. Preimage Size of Factorial Zeroes Function, 795. Check If Two Expression Trees are Equivalent, 1614. 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. Number of People That Can Be Seen in a Grid, 2283. Merge Overlapping Events in the Same Hall, 2495. TIA! The Number of Passengers in Each Bus II, 2154. Thanks for contributing an answer to Stack Overflow! You can do something similar to normal level order traversal. Checking Existence of Edge Length Limited Paths, 1698. Maximum Number of Weeks for Which You Can Work, 1954. The maximum depth is the number of nodes along the longest path from the root node to the leaf node. Find the City With the Smallest Number of Neighbors at a Threshold Distance, 1335. Sci fi story where a woman demonstrating a knife with a safety feature cuts herself when the safety is turned off. Making statements based on opinion; back them up with references or personal experience. Element Appearing More Than 25% In Sorted Array, 1290. Second Minimum Node In a Binary Tree, 673. Binary Tree Zigzag Level Order Traversal | LeetCode 103 | C++ (i.e., from left to right, then right to left for the next level and alternate between). Maximum of Absolute Value Expression, 1135. This article is being improved by another user right now. Number of Burgers with No Waste of Ingredients, 1277. Check if a Parentheses String Can Be Valid, 2117. Number of Substrings Containing All Three Characters, 1359. Minimum Operations to Make All Array Elements Equal, 2605. Traffic Light Controlled Intersection, 1281. Amazon, Microsoft. k==0 level==2 Can't recurse right. Check If Array Pairs Are Divisible by k, 1498. Shortest Impossible Sequence of Rolls, 2355. Count Different Palindromic Subsequences, 744. You will be notified via email once the article is available for improvement. The Users That Are Eligible for Discount, 2231. Minimum Number of Flips to Make the Binary String Alternating, 1889. Avoid unnecessary variables. Construct Binary Search Tree from Preorder Traversal, 1010. Most Stones Removed with Same Row or Column, 952. @banarun Is there a way that does this in O(1) extra space? Kids With the Greatest Number of Candies, 1432. Count Artifacts That Can Be Extracted, 2202. In every iteration, you have nodes of one level in one of the stacks. Minimum Flips to Make a OR b Equal to c, 1319. Design an Expression Tree With Evaluate Function, 1633. array in the end of the Can Make Arithmetic Progression From Sequence, 1503. 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. Maximum Total Beauty of the Gardens, 2237. Find the Prefix Common Array of Two Arrays, 2660. Number of Ways Where Square of Number Is Equal to Product of Two Numbers, 1579. ZigZag binary tree traversal in C++ - Stack Overflow Unique Orders and Customers Per Month, 1566. Reconstruct Original Digits from English, 424. array and make a DFS or preorder tree traversal, while passing another argument called 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. The main idea of level order traversal is to traverse all the nodes of a lower level before moving to any of the nodes of a higher level. Reorder Routes to Make All Paths Lead to the City Zero, 1467. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Make Number of Distinct Characters Equal, 2535. How? Generate a String With Characters That Have Odd Counts, 1375. You may try to solve this Input: K = 1 1 / \ 2 3 / \ / 4 9 8Output:13 24 9 8Explanation: In the above example, first level is printed from left to rightand the second level is printed from right to left, and then last level isprinted from left to right. How can I find the shortest path visiting all nodes in a connected graph as MILP? How to handle repondents mistakes in skip questions? Convert Binary Search Tree to Sorted Doubly Linked List, 428. (i.e, from left to right, then right to left for the next level and alternate between). (level -> dynamic array {containing nodes at that level}), Types of Solution for Binary Tree zigzag level order Traversal, Approach for Binary Tree zigzag level order Traversal, Complexity Analysis for Binary Tree zigzag level order Traversal, using Breadth First search and two stacks. Max Sum of a Pair With Equal Sum of Digits, 2344. Binary Tree Level Order Traversal - LeetCode Maximum Score After Splitting a String, 1423. Create Sorted Array through Instructions, 1650. We initially keep an empty queue and push the root node. Shortest Subarray with Sum at Least K, 865. Greatest English Letter in Upper and Lower Case, 2311. Using a Robot to Print the Lexicographically Smallest String, 2435. Count Number of Special Subsequences, 1956. Construct Binary Tree from Inorder and Postorder Traversal, 107. Maximum Number of Words Found in Sentences, 2115. Unique Substrings With Equal Digit Frequency, 2170. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Minimum Number of Swaps to Make the Binary String Alternating, 1866. Minimum Cost to Move Chips to The Same Position, 1218. Ways to Express an Integer as Sum of Powers, 2789. In your recursive call, use the level of this node in the tree as an argument. Maximum Count of Positive Integer and Negative Integer, 2530. Check If All 1's Are at Least Length K Places Away, 1438. Shortest Distance to Target String in a Circular Array, 2516. The Employee That Worked on the Longest Task, 2433. Solve binary tree zigzag level order traversal interview question & excel your DSA skills. Number of Pairs of Interchangeable Rectangles, 2002. In the end, when we have finished traversing the current level, we need to toggle our left to the right variable. Explanation - Replace Employee ID With The Unique Identifier, 1379. Largest Component Size by Common Factor, 967. Level Order Traversal - Coding Ninjas Largest Combination With Bitwise AND Greater Than Zero, 2279. Count Nodes Equal to Average of Subtree, 2267. Flight Occupancy and Waitlist Analysis, 2786. LeetCode: Binary Tree Level Order Traversal C# Sum of Digits of String After Convert, 1946. Smallest Subtree with all the Deepest Nodes, 873. Sort Even and Odd Indices Independently, 2165. Duration: 1 week to 2 week. Intersection of Three Sorted Arrays, 1217. Maximum Number of Coins You Can Get, 1565. Has these Umbrian words been really found written in Umbrian epichoric alphabet? 1744. Find First Palindromic String in the Array, 2110. K-th Smallest in Lexicographical Order, 448. Removing Minimum Number of Magic Beans, 2174. Sum of Imbalance Numbers of All Subarrays, 2764. is Array a Preorder of Some Binary Tree, 2767. Minimum Consecutive Cards to Pick Up, 2263. Minimum Deletions to Make Array Beautiful, 2218. Maximum Number of Ways to Partition an Array, 2030. It is naturally suited to these level-by-level styled problems. Largest Number After Mutating Substring, 1950. Binary Tree Zigzag Level Order Traversal - LeetCode Editorial Solutions (7.7K) Submissions 4.11 (85 votes) Premium && Subscribe to unlock. Maximize Total Tastiness of Purchased Fruits, 2432. Maximum Number of Tasks You Can Assign, 2074. Best Time to Buy and Sell Stock with Cooldown, 314. Minimum Changes To Make Alternating Binary String, 1759. The British equivalent of "X objects in a trenchcoat". Remove Letter To Equalize Frequency, 2426. Check if Word Can Be Placed In Crossword, 2019. Count Common Words With One Occurrence, 2086. Store it's children in one stack. Visit Array Positions to Maximize Score, 2787. Time Complexity O(n) and space complexity O(n). Minimum Skips to Arrive at Meeting On Time, 1886. Count Ways to Build Rooms in an Ant Colony, 1921. Minimum Additions to Make Valid String, 2646. Example 1: Input: 3 / \ 2 1 Output: 3 1 2 Example 2: Input: 7 / \ 9 7 / \ / 8 8 6 / \ 10 9 Output: 7 7 9 8 8 6 9 10 Your Task: You don't need to read input or print anything. Minimum Operations to Convert Number, 2060. Remove One Element to Make the Array Strictly Increasing, 1910. Cracking the Coding Interview: https://amzn.to/2WeO3eO2. Evaluate the Bracket Pairs of a String, 1812. Minimum Cost to Change the Final Value of Expression, 1897. Number of Smooth Descent Periods of a Stock, 2111. Intervals Between Identical Elements, 2123. Minimum Cost to Make All Characters Equal, 2713. This Hashmap maps the level(an integer value) of the tree against a dynamic array (containing all the nodes of that particular level). You have to use two stacks first stack for printing from left to right second stack for printing from right to left. Count All Valid Pickup and Delivery Options, 1364. Maximize Number of Subsequences in a String, 2208. Smallest Value After Replacing With Sum of Prime Factors, 2508. Find Three Consecutive Integers That Sum to a Given Number, 2178. I can't figure out my mistake. Determine Color of a Chessboard Square, 1815. Recurse right. Check If Word Is Valid After Substitutions, 1005. Consecutive Transactions with Increasing Amounts, 2702. To view this solution you must subscribe to premium. 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. Percentage of Users Attended a Contest, 1634. Space Complexity: The space complexity of the above program is O(n). Amount of Time for Binary Tree to Be Infected, 2388. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Whenever the current level order is from left to right, push the nodes left child, then its right child to the stack nextlevel. Subsequence of Size K With the Largest Even Sum, 2099. Minimum Garden Perimeter to Collect Enough Apples, 1955. Below is the zigzag level order traversal of the above binary tree. We pop from the currentlevel stack and print the nodes value. Find Maximum Number of String Pairs, 2749. The range of the node's value is in the range of 32-bit signed integer. The zigzag traversal of a binary tree means for the node at the top level we go from left to right, then for the next level, we go from right to left, and thus, we keep on changing the direction from left to right, and then from right to left. Finally, do-not forget to swap those two stacks at the end of each level(i.e., when current level is empty). Rearrange Array to Maximize Prefix Score, 2588. Minimized Maximum of Products Distributed to Any Store, 2068. Maximum Nesting Depth of the Parentheses, 1616. Reverse Subarray To Maximize Array Value, 1333. Number of Submatrices That Sum to Target, 1080. In the helper function, if the level is greater than or equal to the size of the result vector, create a new list for the current level in the result vector and add the current node to that list. Practice. Number of Ways to Divide a Long Corridor, 2148. Let's see the implementation of the zigzag traversal of a binary tree using recursion. Eliminative materialism eliminates itself - a familiar idea? Binary Tree Zigzag Level Order Traversal LeetCode Solution - Given the root of a binary tree, return the zigzag level order traversal of its nodes' values. Binary tree from in-order and level-order traversals? User Activity for the Past 30 Days I, 1142. Subtree Removal Game with Fibonacci Tree, 2006. Primarily because of it's DFS nature. Minimum Addition to Make Integer Beautiful, 2458. Continuous variant of the Chinese remainder theorem. Auxiliary Space: O(H) , where h is the height of the tree. 103 Binary Tree Zigzag Level Order Traversal LeetCode solutions Minimize the Maximum Difference of Pairs, 2617. Pour Water Between Buckets to Make Water Levels Equal, 2138. Count Strictly Increasing Subarrays, 2398. Given an array arr[] of size n, write a program to find the largest element in it. Introduction. String to Integer (atoi) 9. Delete Characters to Make Fancy String, 1959. We use a Hashmap data structure. Best Time to Buy and Sell Stock with Transaction Fee, 730. Minimum Operations to Make Array Equal II, 2545. Today, let's learn about a famous and commonly asked Interview Problem, i.e., the ZigZag Traversal of a Binary Tree.. On the other hand, when the current level order is from right to left, we would push the nodes right child first, then its left child. Sum of Mutated Array Closest to Target, 1304. Check if There Is a Valid Parentheses String Path, 2271. Minimum Number of Operations to Make Array Continuous, 2010. 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. Maximum Sum Obtained of Any Permutation, 1593. Binary Tree Zigzag Level Order Traversal Medium 9.6K 249 Companies Given the root of a binary tree, return the zigzag level order traversal of its nodes' values. Can there be a better algorithm for this task?.. Difference Between Maximum and Minimum Price Sum, 2539. Otherwise, simply add the current node to the list for the current level in the result vector. Minimum Deletions to Make Character Frequencies Unique, 1648. Inside the zigzagLevelOrder function, create an empty result vector to store the nodes at each level of the binary tree. Find Original Array From Doubled Array, 2009. The counter variable is unnecessary. Make Array Non-decreasing or Non-increasing, 2264. (ie, from left to right, then right to left for the next level and alternate between). We also need to keep the left to right bool variable that keeps check of the current level we are in. Largest Positive Integer That Exists With Its Negative, 2442. Count Triplets That Can Form Two Arrays of Equal XOR, 1443. Serialize and Deserialize N-ary Tree, 430. Did active frontiersmen really eat 20,000 calories a day? Reverse Substrings Between Each Pair of Parentheses, 1196. If there are multiple sorted orders in wave-form, return the one which is lexicographically smallest. Let' us understand through an example. Height of Binary Tree After Subtree Removal Queries, 2459. Minimize Rounding Error to Meet Target, 1059. Maximize the Topmost Element After K Moves, 2203. Guess the Majority in a Hidden Array, 1541. Return. Special Array With X Elements Greater Than or Equal X, 1611. Number of Ways to Form a Target String Given a Dictionary, 1640. Step-By-Step Directions From a Binary Tree Node to Another, 2098. But I am stuck at one type of test cases, i.e., when the tree is not balanced. Maximum Score Words Formed by Letters, 1261. Note that the value of the variable changes after the completion of the traversal of each level. To do this, create a recursive helper function traverse that takes the current node, its level, and the result vector as input. The concept is to use the level order traversal of a binary tree in a different manner. Longest Path With Different Adjacent Characters, 2247. Count Substrings Without Repeating Character, 2744. 3 Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts, 1466. Difference Between Ones and Zeros in Row and Column, 2486. Minimum Non-Zero Product of the Array Elements, 1972. Thanks for contributing an answer to Stack Overflow! 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. res[level] Longest ZigZag Path in a Binary Tree, 1374. Minimum Cost to Reach Destination in Time, 1930. Final Value of Variable After Performing Operations, 2014. Change Null Values in a Table to the Previous Value, 2389. As we traverse nodes in the queue, we need to push them in a temporary array. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold, 1347. Number of Ways to Build Sturdy Brick Wall, 2186. Find Closest Node to Given Two Nodes, 2366. 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 . Maximum Number of Accepted Invitations, 1821. Approach: The solution to the problem is based on the following idea: Start performing level order traversal on the tree from the left most end. Users With Two Purchases Within Seven Days, 2230. The array elements in the resultant array must be such that arr[0] >= arr[1] <= arr[2] >= arr[3] <= arr[4] and so on. Find the Score of All Prefixes of an Array, 2642. If the level is even, then we will add the root value in the Drop Type 1 Orders for Customers With Type 0 Orders, 2085. Divide Players Into Teams of Equal Skill, 2492. LeetCode: Binary Tree Zigzag Level Order Traversal C# ZigZag Tree Traversal - Stack Overflow Apply Bitwise Operations to Make Strings Equal, 2550. Find First and Last Position of Element in Sorted Array, 80. Assume the two stacks are current: currentlevel and nextlevel. First you add the 1 (the root) to your first level. @NikunjBanka I don't think it is possible, even if you use some think like recursion the stack space is used, Instead of having true in while, use !queue.isEmpty() in while, New! We know that a stack works on a Last In First Out (LIFO) principle. Binary String With Substrings Representing 1 To N, 1026. Note that the optimization of this approach is the approach where we used deque. Find the Longest Semi-Repetitive Substring, 2734. Maximum of Minimum Values in All Subarrays, 1951. Find the Index of the First Occurrence in a String, 30. Primary Department for Each Employee, 1790. Prime Number of Set Bits in Binary Representation, 774. Check if All the Integers in a Range Are Covered, 1894. (each level is a dynamic array containing tree nodes). Recommended Practice ZigZag Tree Traversal Try It! Make the XOR of All Segments Equal to Zero, 1789. Delete N Nodes After M Nodes of a Linked List, 1475. Input: K = 3 1 / \ 2 3 / \ / \ 4 5 6 7 / \ / \ / 8 9 10 11 12 / \ / 13 14 15. You will be notified via email once the article is available for improvement. Average Height of Buildings in Each Segment, 2016. Maximum Value of K Coins From Piles, 2220. Special Positions in a Binary Matrix, 1585. Binary Tree Longest Consecutive Sequence, 302. If we closely examine, for even levels we need to go from left to right while for odd levels we need to go from right to left. Smallest Missing Non-negative Integer After Operations, 2602. Time Complexity: (N) , where n is the number of nodes in the binary tree. Minimum Operations to Make the Array K-Increasing, 2113. Toggle.

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