Solution (leetcode-in-java 1.21 API)

java.lang.Object
- g0201_0300.s0207_course_schedule.Solution

```
public class Solution
extends Object
```
207 - Course Schedule.
Medium

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] = [a_i, b_i] indicates that you must take course b_i first if you want to take course a_i.
- 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.

Example 1:

Input: numCourses = 2, prerequisites = [[1,0]]

Output: true

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

Example 2:

Input: numCourses = 2, prerequisites = [[1,0],[0,1]]

Output: false

Explanation: 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.

Constraints:
- 1 <= numCourses <= 10⁵
- 0 <= prerequisites.length <= 5000
- prerequisites[i].length == 2
- 0 <= a_i, b_i < numCourses
- All the pairs prerequisites[i] are unique.

- Constructor Summary
  
  Constructors
  Constructor Description
  
  Solution()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  boolean canFinish(int numCourses, int[][] prerequisites)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- Solution
```
public Solution()
```

Method Detail

canFinish

public boolean canFinish(int numCourses,
                         int[][] prerequisites)