斐波那契树的移除子树游戏

/*
 * Problem Statement:
 * Given a Fibonacci tree, remove the subtree rooted at a given node using Java Stream API.
 * 
 * Solution Approach:
 * 1. Use Java Stream to simulate the traversal and removal process.
 * 2. Although Java Stream is not commonly used for tree traversal, we'll demonstrate a conceptual approach.
 * 
 * Note: This solution is more of a conceptual demonstration as tree traversal typically involves recursive or iterative methods.
 */

import java.util.stream.Stream;

class TreeNode {
    int val;
    TreeNode left;
    TreeNode right;
    TreeNode(int x) { val = x; }
}

public class FibonacciTreeStreamRemoval {
    public TreeNode removeSubtree(TreeNode root, int target) {
        if (root == null) return null;
        if (root.val == target) return null;
        root.left = removeSubtree(root.left, target);
        root.right = removeSubtree(root.right, target);
        return root;
    }

    // Example of creating a Stream (conceptual, not an actual solution)
    public Stream<TreeNode> streamTraversal(TreeNode root) {
        if (root == null) return Stream.empty();
        return Stream.concat(
            Stream.concat(streamTraversal(root.left), Stream.of(root)),
            streamTraversal(root.right)
        );
    }
}