Given a nested list of integers, return the sum of all integers in the list weighted by their depth. Each element is either an integer, or a list – wh ...

Given a non-empty 2D array grid of 0’s and 1’s, an island is a group of 1’s (representing land) connected 4-directionally (horizontal or vertical.) Yo ...

Given a n,m which means the row and column of the 2D matrix and an array of pair A(size k). Originally, the 2D matrix is all 0 which means there is on ...

Cookie池 存储模块负责存储每个账号的用户名密码以及每个账号对应的Cookies信息，同时还需要提供一些方法来实现方便的存取操作。 生成模块负责生成新的Cookies。此模块会从存储模块逐个拿取账号的用户名和密码，然后模拟登录目标页面，判断登录成功，就将Cookies返回并交给存储模块存储。 ...

代理池 存储模块使用Redis的有序集合，用来做代理的去重和状态标识，同时它也是中心模块和基础模块，将其他模块串联起来。 获取模块定时从代理网站获取代理，将获取的代理传递给存储模块，并保存到数据库。 检测模块定时通过存储模块获取所有代理，并对代理进行检测，根据不同的检测结果对代理设置不同 ...

There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown operations towards buttons, ...

There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every ...

Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compute the resea ...

Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher’s h-index. According ...

An equal sum partition of a sequence of numbers is a grouping of the numbers (in the same order as the original sequence) in such a way that each grou ...