Just DO IT by luckygxf

摘要： 有很多实现的方法 使用blockingqueue实现 demo 注意： 自定义容器实现生产者消费者 备注: 阅读全文

摘要： 多线程访问同一个变量，不进行同步，会造成结果不一致。这里解决方案有很多，使用原子变量。加锁同步，使用synchronized同步。下面是一个lock demo，后面会分析lock实现原理。lock使用的是公平锁还是非公平锁等 阅读全文

摘要： Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R >= L). You might 阅读全文

摘要： You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: Each round's operation is permane 阅读全文

摘要： Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order. E 阅读全文

摘要： Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below. Examp 阅读全文

摘要： Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation. Note: The given inte 阅读全文

摘要： Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of 阅读全文

摘要： Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n 阅读全文

摘要： Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the or 阅读全文