637. Average of Levels in Binary Tree LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Average of Levels in Binary Tree Given the root of a binary tree, return the average value of the nodes on each level in the form of an array. Answers within 10-5 of the actual answer will be accepted.

Example 1:

Input: root = [3,9,20,null,null,15,7]
Output: [3.00000,14.50000,11.00000]
Explanation: The average value of nodes on level 0 is 3, on level 1 is 14.5, and on level 2 is 11.
Hence return [3, 14.5, 11].

Example 2:

Input: root = [3,9,20,15,7]
Output: [3.00000,14.50000,11.00000]


  • The number of nodes in the tree is in the range [1, 104].
  • -231 <= Node.val <= 231 - 1

Average of Levels in Binary Tree Solutions

Time: O(n)
Space: O(n)


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