如何在二叉搜索树中找到最小值?

rks48beu  于 2021-07-13  发布在  Java
关注(0)|答案(1)|浏览(377)

我必须编写一个客户机方法,使用给定的代码,以二叉搜索树中最小的值返回对节点中信息的引用。
这是压缩文件
我必须用这个方法签名:
golfer min(二叉树)
以下是我写的:

Golfer min(BinarySearchTree<Golfer> tree)
   {
      int treeSize = tree.reset(BinarySearchTree.INORDER);
      int numNodes = 0;
      for(int count = 1; count <= treeSize; count++)
      {
         if((tree.getNext(BinarySearchTree.INORDER).compareTo(maxValue)) <= 0)
            numNodes = numNodes + 1;
      }
      return numNodes;     
   }
uz75evzq

uz75evzq1#

我猜你在找得分最低的高尔夫球手
方法1:o(lg(n))时间,因为它沿着树的左侧运行

public Golfer min(BinarySearchTree<Golfer> tree) {
    BSTNode<Golfer> node = tree.root;
    if (node == null) {
        return null;
    }
    while (node.getLeft() != null) {
        node = node.getLeft();
    }
    return node.getInfo();
}

方法2:o(n)时间,因为它遍历树中的所有元素以创建有序遍历

public Golfer min2(BinarySearchTree<Golfer> tree) {
    int treeSize = tree.reset(BinarySearchTree.INORDER);
    if (treeSize <= 0) {
        return null;
    }
    return tree.getNext(BinarySearchTree.INORDER);
}

下面是一些测试上述代码的代码

public static void main(String[] args) {
    BinarySearchTree<Golfer> bst = new BinarySearchTree<Golfer>();
    bst.add(new Golfer("A", 10));
    bst.add(new Golfer("B", 12));
    bst.add(new Golfer("C", 8));
    bst.add(new Golfer("D", 9));
    bst.add(new Golfer("E", 3));

    Golfer min = new Test().min(bst);
    //Golfer min = new Test().min2(bst);
    if (min != null) {
        System.out.println("min name: " + min.name + ", min score: " + min.score);
    } else {
        System.out.println("Empty tree");
    }
}

输出:

min name: E, min score: 3

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