W3Schools 在线编辑器 - W3Schools 中文教程

Python

Java

#include <stdio.h>
#include <stdlib.h>

typedef struct TreeNode {
    int data;
    struct TreeNode* left;
    struct TreeNode* right;
} TreeNode;

TreeNode* createNode(int data) {
    TreeNode* newNode = (TreeNode*)malloc(sizeof(TreeNode));
    newNode->data = data;
    newNode->left = NULL;
    newNode->right = NULL;
    return newNode;
}

TreeNode* search(TreeNode* node, int target) {
    if (node == NULL) {
        return NULL;
    } else if (node->data == target) {
        return node;
    } else if (target < node->data) {
        return search(node->left, target);
    } else {
        return search(node->right, target);
    }
}

int main() {
    TreeNode* root = createNode(13);
    TreeNode* node7 = createNode(7);
    TreeNode* node15 = createNode(15);
    TreeNode* node3 = createNode(3);
    TreeNode* node8 = createNode(8);
    TreeNode* node14 = createNode(14);
    TreeNode* node19 = createNode(19);
    TreeNode* node18 = createNode(18);

root->left = node7;
    root->right = node15;

node7->left = node3;
    node7->right = node8;

node15->left = node14;
    node15->right = node19;

node19->left = node18;

// Search for a value
    TreeNode* result = search(root, 8);
    if (result) {
        printf("Found the node with value: %d\n", result->data);
    } else {
        printf("Value not found in the BST.\n");
    }

// Free the memory (optional but good practice)
    free(node18);
    free(node19);
    free(node14);
    free(node8);
    free(node3);
    free(node15);
    free(node7);
    free(root);
    return 0;
}

//C

public class Main {

static class TreeNode {
        int data;
        TreeNode left;
        TreeNode right;

TreeNode(int data) {
            this.data = data;
            left = null;
            right = null;
        }
    }

public static TreeNode search(TreeNode node, int target) {
        if (node == null) {
            return null;
        } else if (node.data == target) {
            return node;
        } else if (target < node.data) {
            return search(node.left, target);
        } else {
            return search(node.right, target);
        }
    }

public static void main(String[] args) {
        TreeNode root = new TreeNode(13);
        TreeNode node7 = new TreeNode(7);
        TreeNode node15 = new TreeNode(15);
        TreeNode node3 = new TreeNode(3);
        TreeNode node8 = new TreeNode(8);
        TreeNode node14 = new TreeNode(14);
        TreeNode node19 = new TreeNode(19);
        TreeNode node18 = new TreeNode(18);

root.left = node7;
        root.right = node15;

node7.left = node3;
        node7.right = node8;

node15.left = node14;
        node15.right = node19;

node19.left = node18;

// Search for a value
        TreeNode result = search(root, 8);
        if (result != null) {
            System.out.println("Found the node with value: " + result.data);
        } else {
            System.out.println("Value not found in the BST.");
        }
    }
}

// Java