Given a binary search tree, write a function kthSmallest
to find the kth smallest element in it.
/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ public class Solution { public int kthSmallest(TreeNode root, int k) { if (root != null) { Stack<TreeNode> stack = new Stack<>(); while (!stack.isEmpty() || root != null) { if (root != null) { stack.push(root); root = root.left; } else { root = stack.pop(); if (--k == 0) { return root.val; } root = root.right; } } } return 0; } }
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