Java inorder recursive solution without global variant

  • 1
    public class Solution {
        public int kthSmallest(TreeNode root, int k) {
            int[] index = new int[1];
            index[0] = k;
            return inorder(root, index);
        public int inorder(TreeNode root, int[] index) {
            if(root == null) return -1;
            int left = inorder(root.left, index);
            if(left != -1) return left;
            if(index[0] == 0) return root.val;
            return inorder(root.right, index);

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