The root node should be of value 16 after compiling the code

[Prathamesh-01]

If we traverse through the tree from down, the child of root node will contain 12 and 4, so the summation of both is 16 but you got 20

Correct

…

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[himanigupta2003]

noooo....thats completely right
see
/*
10
/
-2 6
/ \ / \
8 -4 7 5

*/

/*

 20(4-2+12+6)
       /      \
4(8-4)      12(7+5)
   /   \      /  \ 
 0      0    0    0

*/

now you can relate.