There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course bi first if you want to take course ai.
For example, the pair [0, 1] indicates that to take course 0 you have to first take course 1.
Return true if you can finish all courses. Otherwise, return false.
1 <= numCourses <= 20000 <= prerequisites.length <= 5000prerequisites[i].length == 20 <= ai, bi < numCoursesprerequisites[i] are uniquenumCourses = 2, prerequisites = [[1,0]]truenumCourses = 2, prerequisites = [[1,0],[0,1]]false