Remove Methods From Project

Description

You are maintaining a project with n methods (0 to n - 1). Given integer k and invocations where invocations[i] = [ai, bi] means ai calls bi. Method k has a bug; it and all methods it invokes (directly or indirectly) are suspicious. Remove all suspicious methods only if no non-suspicious method calls any of them; otherwise remove none. Return the remaining methods.

Code

class Solution:
    def remainingMethods(self, n: int, k: int, invocations: List[List[int]]) -> List[int]: