Plz check why it showing height 1 less than actual one
Your code seems correct and is giving the correct output for the input i tested.
Note that you have to give preorder input.
/* Constructing tree given in the above figure
10
/ \
30 15
/ \
20 5 */
Input: 10 30 20 -1 -1 5 -1 -1 15 -1 -1
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