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Count binary search tree node using Recursion

Time complexity of this program O(n)

Accepted Output

Given BST tree node is:

520, 469, 557, 446, 549, 558, 432, 533, 580, 568

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520557549469446558432533580568

Sum of node is : [432 + 446 + 469 + 520 + 533 + 549 + 557 + 558 + 568 + 580 ] = 5212

Given BST tree node is:

520, 509, 589, 498, 587, 685, 460, 508, 559, 483, 580

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520509589498460587559483508580685

Sum of node is : [460 + 483 + 498 + 508 + 509 + 520 + 559 + 580 + 587 + 589 + 685 ] = 5978

Below in C implementation of this problem. Iterative approach.

Output
  BST Data is :  10  15  20  30  50  60  70  80  90
 Sum of BST node is : [425]

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