Given a binary tree and a sum,

determine if the tree has a root-to-leaf path such that adding up all the values

along the path equals the given sum.

**Example**

Given the below binary tree and sum = 22,

5

/ \

4 8

/ / \

11 13 4

/ \ \

7 2 1

return true, as there exist a root-to-leaf path 5->4->11->2 which sum is 22.

determine if the tree has a root-to-leaf path such that adding up all the values

along the path equals the given sum.

Given the below binary tree and sum = 22,

5

/ \

4 8

/ / \

11 13 4

/ \ \

7 2 1

return true, as there exist a root-to-leaf path 5->4->11->2 which sum is 22.

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