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binary tree zigzag level order traversal

Shihab answered on June 22, 2023 Popularity 7/10 Helpfulness 1/10

answer binary tree zigzag level order traversal

related zigzag level order traversal

binary tree zigzag level order traversal

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Input: root = [3,9,20,null,null,15,7]
Output: [[3],[20,9],[15,7]]

Popularity 7/10 Helpfulness 1/10 Language whatever

Source: leetcode.com

Tags: binary-tree traversal whatever zigzag

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Contributed on Oct 13 2023

Shihab

0 Answers Avg Quality 2/10

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zigzag level order traversal

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode() {}
 *     TreeNode(int val) { this.val = val; }
 *     TreeNode(int val, TreeNode left, TreeNode right) {
 *         this.val = val;
 *         this.left = left;
 *         this.right = right;
 *     }
 * }
 */
class Solution {
    public List<List<Integer>> levelOrderBottom(TreeNode root) {
            List<List<Integer>> list = new ArrayList<>();
        Deque<TreeNode> queue = new ArrayDeque<>();
        if(root==null)
            return list;
        queue.offerLast(root);
        while(!queue.isEmpty())
        {
            ArrayList<Integer> l= new ArrayList<>();
            int size=queue.size();
            for(int i=0;i<size;i++)
            {
                TreeNode node=queue.pollFirst();
                if(node.left!=null)
                    queue.offerLast(node.left);
                if(node.right!=null)
                    queue.offerLast(node.right);
                l.add(node.val);

            }
            list.add(l);

        }
        Collections.reverse(list);
        return list;
        
    }
}

Popularity 8/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: java traversal zigzag ja

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Contributed on Jun 22 2023

Zealous Zebra

0 Answers Avg Quality 2/10

binary tree zigzag level order traversal

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