There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you ...

There are n different online courses numbered from 1 to n. Each course has some duration(course length) tand closed on dth day. A course should ...

There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have ...

题目： There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you ...

Given a picture consisting of black and white pixels, and a positive integer N, find the number o ...

Given two integers n and k, you need to construct a list which contains n different positive i ...

Given an unsorted array nums, reorder it such that nums[0] < nums[1] > nums[2] < nums[3] ...

There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by ro ...