Binary Tree Zigzag Level Order Traversal LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [๐Ÿ’ฏCorrect]

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In this post, you will find the solution for the Binary Tree Zigzag Level Order Traversal in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the ProblemBinary Tree Zigzag Level Order Traversalโ€“ LeetCode Problem

Binary Tree Zigzag Level Order Traversalโ€“ LeetCode Problem

Problem:

Given the root of a binary tree, return the zigzag level order traversal of its nodes’ values. (i.e., from left to right, then right to left for the next level and alternate between).

Example 1:

tree1
Input: root = [3,9,20,null,null,15,7]
Output: [[3],[20,9],[15,7]]

Example 2:

Input: root = [1]
Output: [[1]]

Example 3:

Input: root = []
Output: []

Constraints:

  • The number of nodes in the tree is in the range [0, 2000].
  • -100 <= Node.val <= 100
Binary Tree Zigzag Level Order Traversalโ€“ LeetCode Solutions
Binary Tree Zigzag Level Order Traversal Solution in C++:
class Solution {
 public:
  vector<vector<int>> zigzagLevelOrder(TreeNode* root) {
    if (!root)
      return {};

    vector<vector<int>> ans;
    queue<TreeNode*> q{{root}};
    bool isLeftToRight = true;

    while (!q.empty()) {
      const int size = q.size();
      vector<int> currLevel(size);
      for (int i = 0; i < size; ++i) {
        TreeNode* node = q.front();
        q.pop();
        const int index = isLeftToRight ? i : size - i - 1;
        currLevel[index] = node->val;
        if (node->left)
          q.push(node->left);
        if (node->right)
          q.push(node->right);
      }
      ans.push_back(node);
      isLeftToRight = !isLeftToRight;
    }

    return ans;
  }
};
Binary Tree Zigzag Level Order Traversal Solution in Java:
class Solution {
  public List<List<Integer>> zigzagLevelOrder(TreeNode root) {
    if (root == null)
      return new ArrayList<>();

    List<List<Integer>> ans = new ArrayList<>();
    Deque<TreeNode> q = new ArrayDeque<>(Arrays.asList(root));
    boolean isLeftToRight = true;

    while (!q.isEmpty()) {
      List<Integer> currLevel = new ArrayList<>();
      for (int size = q.size(); size > 0; --size)
        if (isLeftToRight) {
          TreeNode node = q.pollFirst();
          currLevel.add(node.val);
          if (node.left != null)
            q.addLast(node.left);
          if (node.right != null)
            q.addLast(node.right);
        } else {
          TreeNode node = q.pollLast();
          currLevel.add(node.val);
          if (node.right != null)
            q.addFirst(node.right);
          if (node.left != null)
            q.addFirst(node.left);
        }
      ans.add(currLevel);
      isLeftToRight = !isLeftToRight;
    }

    return ans;
  }
}
ยฉ 2022 GitHub, Inc.
Binary Tree Zigzag Level Order Traversal Solution in Python:
class Solution:
  def zigzagLevelOrder(self, root: Optional[TreeNode]) -> List[List[int]]:
    if not root:
      return []

    ans = []
    q = deque([root])
    isLeftToRight = True

    while q:
      size = len(q)
      currLevel = [0] * size
      for i in range(size):
        node = q.popleft()
        index = i if isLeftToRight else size - i - 1
        currLevel[index] = node.val
        if node.left:
          q.append(node.left)
        if node.right:
          q.append(node.right)
      ans.append(currLevel)
      isLeftToRight = not isLeftToRight

    return ans

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