"""
# Definition for a Node.
class Node:
    def __init__(self, val=None, children=None):
        self.val = val
        self.children = children
"""

class Solution:
    # Time Complexity: O(N), N = total nodes in the given tree, we visit each node once
    # Space Complexity: O(N), N = total nodes in the given tree, output will be the same len as given total nodes
    def levelOrder(self, root: 'Node') -> List[List[int]]:
        if not root:
            return None

        result = []
        q = deque([root])

        while q:
            current_row = []
            for _ in range(len(q)):
                node = q.popleft()
                current_row.append(node.val)

                for child in node.children:
                    q.append(child)

            result.append(current_row)
        
        return result