feat(work): add solution stub for Course Schedule (207)

work/1/Medium/Depth-First Search/207.course-schedule.py

@@ -0,0 +1,52 @@
+"""
+207. Course Schedule
+Difficulty: Medium
+https://leetcode.com/problems/course-schedule/
+
+──────────────────────────────────────────────────
+
+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.
+
+ 
+
+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 <= 2000
+
+	• 0 <= prerequisites.length <= 5000
+
+	• prerequisites[i].length == 2
+
+	• 0 <= ai, bi < numCourses
+
+	• All the pairs prerequisites[i] are unique.
+"""
+
+class Solution:
+    def canFinish(self, numCourses: int, prerequisites: list[list[int]]) -> bool:
+