text: here we are directly taking height = 4 according to the given tree but we can pre - calculate height = max depth in one more dfs
code: int height = 4 ; preprocess ( height ) ; cout << " LCA ( 11,8 ) ▁ : ▁ " << LCASQRT ( 11 , 8 ) << endl ; cout << " LCA ( 3,13 ) ▁ : ▁ " << LCASQRT ( 3 , 13 ) << endl ; return 0 ; }