2026年7月23日
2096. Step-By-Step Directions From a Binary Tree Node to Another
摘要： ou are given the root of a binary tree with n nodes. Each node is uniquely assigned a value from 1 to n. You are also given an integer startValue repr 阅读全文
posted @ 2026-07-23 00:22 北叶青藤 阅读(2) 评论(0) 推荐(0)
Find path from root to a target node in Binary Tree
摘要： def root_to_target(root: TreeNode, target: int): path = [] def dfs(node): if not node: return False path.append(node.val) if node.val == target: retur 阅读全文
posted @ 2026-07-23 00:16 北叶青藤 阅读(2) 评论(0) 推荐(0)
2026年7月21日
When Dijkstra Algorithm Should be Use?
摘要： A good way to think about Dijkstra is: Dijkstra works when the first time you remove a node from the priority queue, you already know its optimal valu 阅读全文
posted @ 2026-07-21 00:49 北叶青藤 阅读(3) 评论(0) 推荐(0)
2026年7月16日
1188. Design Bounded Blocking Queue
摘要： Implement a thread-safe bounded blocking queue that has the following methods: BoundedBlockingQueue(int capacity) The constructor initializes the queu 阅读全文
posted @ 2026-07-16 12:50 北叶青藤 阅读(3) 评论(0) 推荐(0)
1115. Print FooBar Alternately
摘要： Suppose you are given the following code: class FooBar { public void foo() { for (int i = 0; i < n; i++) { print("foo"); } } public void bar() { for ( 阅读全文
posted @ 2026-07-16 07:05 北叶青藤 阅读(8) 评论(0) 推荐(0)
1114. Print in Order
摘要： Suppose we have a class: public class Foo { public void first() { print("first"); } public void second() { print("second"); } public void third() { pr 阅读全文
posted @ 2026-07-16 05:43 北叶青藤 阅读(4) 评论(0) 推荐(0)
1242. Web Crawler Multithreaded
摘要： Given a URL startUrl and an interface HtmlParser, implement a Multi-threaded web crawler to crawl all links that are under the same hostname as startU 阅读全文
posted @ 2026-07-16 05:02 北叶青藤 阅读(6) 评论(0) 推荐(0)
2026年7月13日
Python Multi-threading
摘要： import queue import threading import time # Create a queue q = queue.Queue() def worker(): while True: # Retrieve a task from the queue item = q.get() 阅读全文
posted @ 2026-07-13 04:33 北叶青藤 阅读(5) 评论(0) 推荐(0)
2026年4月6日
bot ip
摘要： part 1. 给 时间 和 IP， 看在提供的input里面如果ip 超出了一个threshold，判断为机器人，output 机器人的ip input: following string, and threshold 1, ip11, ip21, ip14, ip14, ip25, ip3 is 阅读全文
posted @ 2026-04-06 12:01 北叶青藤 阅读(13) 评论(0) 推荐(0)
Log Rate Limiter
摘要： Problem: Storefront Log Rate Limiter You are given a stream of log events. Each event contains at least: timestamp: arrival time (assume integer secon 阅读全文
posted @ 2026-04-06 11:07 北叶青藤 阅读(10) 评论(0) 推荐(0)
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