1.6 KiB
1.6 KiB
TODO 0207. 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 course0you have to first take course1.
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 <= 20000 <= prerequisites.length <= 5000prerequisites[i].length == 20 <= a_{i}, b_{i} < numCourses- All the pairs prerequisites[i] are unique.
TODO Approach
Write your approach here.
TODO Python
class Solution:
def canFinish(self, numCourses: int, prerequisites: List[List[int]]) -> bool:TODO C++
class Solution {
public:
bool canFinish(int numCourses, vector<vector<int>>& prerequisites) {
}
};