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Main.java
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Main.java
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package com.company;
import java.util.ArrayList;
import java.util.List;
public class Main {
public static void main(String[] args) {
// write your code here
}
}
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
class BSTIterator {
List<Integer> nodes;
int index;
public BSTIterator(TreeNode root) {
nodes = new ArrayList<>();
dfs(root);
}
private void dfs(TreeNode node) {
if (node == null) return;
dfs(node.left);
nodes.add(node.val);
dfs(node.right);
}
public int next() {
return nodes.get(index++);
}
public boolean hasNext() {
return index < nodes.size();
}
}