Easiest python solution to understand
Intuition\n Describe your first thoughts on how to solve this problem. \nThe problem aims to find the level in a binary tree that has the maximum sum of node va
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nThe problem aims to find the level in a binary tree that has the maximum sum of node values. By traversing the tree in a breadth-first manner, we can calculate the sum of node values at each level and keep track of the maximum sum encountered.\n# Approach\n<!-- Describe your approach to solving the problem. -->\n1. Initialize a queue with the root node and set the maximum level and maximum sum to 1 and negative infinity, respectively.\n1. Perform a breadth-first traversal of the binary tree using the queue.\n1. At each level, calculate the sum of node values and store it in a variable.\n1. Update the maximum sum and maximum level if the current level\'s sum is greater than the previous maximum.\n1. Enqueue the children of the current nodes to process the next level.\n1. Repeat steps 3-5 until all levels have been processed.\n1. Return the maximum level with the maximum sum.\n# Complexity\n- Time complexity: $$O(n)$$\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity: $$O(n)$$\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```\nclass Solution:\n    def maxLevelSum(self, root):\n        # Check if the root is None\n        if not root:\n            return 0\n\n        # Initialize variables for maximum level, maximum sum, current level\n        queue = [root]\n        max_level = 1\n        max_sum = float(\'-inf\')\n        level = 1\n\n        while queue:\n            # Initialize level sum and next level\n            level_sum = 0\n            next_level = []\n\n            # Process nodes at the current level\n            for node in queue:\n                # Update the level sum with the value of the current node\n                level_sum += node.val\n\n                # Add the left and right child of the current node to the next level\n                if node.left:\n                    next_level.append(node.left)\n                if node.right:\n                    next_level.append(node.right)\n\n            # Update the maximum sum and level if the current level sum is greater\n            if level_sum > max_sum:\n                max_sum = level_sum\n                max_level = level\n\n            # Move to the next level\n            queue = next_level\n            level += 1\n\n        # Return the maximum level with the maximum sum\n        return max_level\n\n```
['Python3']