leetcode Course Schedule

题目连接

https://leetcode.com/problems/course-schedule/  

Course Schedule

Description

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 to first take course 1, which is expressed as a pair: [0,1]

Given the total number of courses and a list of prerequisite pairs, is it possible for you to finish all courses?

For example:

2, [[1,0]]
There are a total of 2 courses to take. To take course 1 you should have finished course 0. So it is possible.

2, [[1,0],[0,1]]
There are a total of 2 courses to take. To take course 1 you should have finished course 0, and to take course 0 you should also have finished course 1. So it is impossible.
Note:
The input prerequisites is a graph represented by a list of edges, not adjacency matrices. Read more about how a graph is represented.

拓扑排序。。

posted @   GadyPu  阅读(164)  评论(0编辑  收藏  举报
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