Sum of nodes in binary tree whose grandparents exists
Grandchild node of binary tree whose parents and grandparents exist. For example.

Example 1
4
/ \
/ \
12 7
/ \ \
2 3 1
/ \ /
6 8 5
/
9
-------------------
Here node
node key parent grandparents
2 12 4
3 12 4
6 3 12
8 3 12
9 6 3
1 7 4
5 1 7
--------------------------
34
--------------------------
Example 2
-----------
4
/ \
/ \
12 7
/ \
2 3
/ \
6 8
/
9
-------------------
Here node
node key parent grandparents
2 12 4
3 12 4
6 3 12
8 3 12
9 6 3
--------------------------
28
--------------------------
Here given code implementation process.
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