Given the root of a binary tree, return the sum of every tree node's tilt.

The tilt of a tree node is the absolute difference between the sum of all left subtree node values and all right subtree node values. If a node does not have a left child, then the sum of the left subtree node values is treated as 0. The rule is similar if the node does not have a right child.

To solve this problem, you can create a recursive function that traverses the tree and calculates the tilt for each node. Here is an algorithm that you can follow:

1. Initialize a variable called "tiltSum" to 0.
2. Write a recursive function called "calculateTilt" that takes a node as an argument.
3. In the function, check if the node is null. If it is, return 0.
4. Recursively call calculateTilt for the left subtree and the right subtree of the node.
5. Calculate the tilt for the current node by taking the absolute difference between the sum of the values in the left subtree and the sum of the values in the right subtree.
6. Add the tilt to the "tiltSum" variable.
7. Return the sum of the values in the left subtree, the sum of the values in the right subtree, and the value of the current node, added together.
8. Call the calculateTilt function with the root node as the argument.
9. Return the value of "tiltSum".

Here is the Python code that implements the algorithm:

```
class TreeNode:
    def __init__(self, val=0, left=None, right=None):
        self.val = val
        self.left = left
        self.right = right

class Solution:
    def findTilt(self, root: TreeNode) -> int:
        tiltSum = 0
        
        def calculateTilt(node):
            nonlocal tiltSum
            if not node:
                return 0
            
            leftSum = calculateTilt(node.left)
            rightSum = calculateTilt(node.right)
            tilt = abs(leftSum - rightSum)
            tiltSum += tilt
            
            return leftSum + rightSum + node.val
        
        calculateTilt(root)
        
        return tiltSum
```

Note: This code assumes that the TreeNode class has a "val" attribute that stores the value of the node, and "left" and "right" attributes that point to the left and right subtrees of the node.