You are maintaining a project that has n methods numbered from 0 to n - 1.
You are given two integers n and k, and a 2D integer array invocations, where invocations[i] = [ai, bi] indicates that method ai invokes method bi.
There is a known bug in method k. Method k, along with any method invoked by it, either directly or indirectly, are considered suspicious and we aim to remove them.
A group of methods can only be removed if no method outside the group invokes any methods within it.
\n\nReturn an array containing all the remaining methods after removing all the suspicious methods. You may return the answer in any order. If it is not possible to remove all the suspicious methods, none should be removed.
\n\n\n
Example 1:
\n\nInput: n = 4, k = 1, invocations = [[1,2],[0,1],[3,2]]
\n\nOutput: [0,1,2,3]
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/07/18/graph-2.png\")
Method 2 and method 1 are suspicious, but they are directly invoked by methods 3 and 0, which are not suspicious. We return all elements without removing anything.
\nExample 2:
\n\nInput: n = 5, k = 0, invocations = [[1,2],[0,2],[0,1],[3,4]]
\n\nOutput: [3,4]
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/07/18/graph-3.png\")
Methods 0, 1, and 2 are suspicious and they are not directly invoked by any other method. We can remove them.
\nExample 3:
\n\nInput: n = 3, k = 2, invocations = [[1,2],[0,1],[2,0]]
\n\nOutput: []
\n\nExplanation:
\n\n![\"\"](\"https://assets.leetcode.com/uploads/2024/07/20/graph.png\")
All methods are suspicious. We can remove them.
\n\n
Constraints:
\n\n1 <= n <= 1050 <= k <= n - 10 <= invocations.length <= 2 * 105invocations[i] == [ai, bi]0 <= ai, bi <= n - 1ai != biinvocations[i] != invocations[j]你正在维护一个项目，该项目有 n 个方法，编号从 0 到 n - 1。
给你两个整数 n 和 k，以及一个二维整数数组 invocations，其中 invocations[i] = [ai, bi] 表示方法 ai 调用了方法 bi。
已知如果方法 k 存在一个已知的 bug。那么方法 k 以及它直接或间接调用的任何方法都被视为 可疑方法 ，我们需要从项目中移除这些方法。
只有当一组方法没有被这组之外的任何方法调用时，这组方法才能被移除。
\n\n返回一个数组，包含移除所有 可疑方法 后剩下的所有方法。你可以以任意顺序返回答案。如果无法移除 所有 可疑方法，则 不 移除任何方法。
\n\n\n\n
示例 1:
\n\n输入: n = 4, k = 1, invocations = [[1,2],[0,1],[3,2]]
\n\n输出: [0,1,2,3]
\n\n解释:
\n\n
方法 2 和方法 1 是可疑方法，但它们分别直接被方法 3 和方法 0 调用。由于方法 3 和方法 0 不是可疑方法，我们无法移除任何方法，故返回所有方法。
\n示例 2:
\n\n输入: n = 5, k = 0, invocations = [[1,2],[0,2],[0,1],[3,4]]
\n\n输出: [3,4]
\n\n解释:
\n\n
方法 0、方法 1 和方法 2 是可疑方法，且没有被任何其他方法直接调用。我们可以移除它们。
\n示例 3:
\n\n输入: n = 3, k = 2, invocations = [[1,2],[0,1],[2,0]]
\n\n输出: []
\n\n解释:
\n\n
所有方法都是可疑方法。我们可以移除它们。
\n\n\n
提示:
\n\n1 <= n <= 1050 <= k <= n - 10 <= invocations.length <= 2 * 105invocations[i] == [ai, bi]0 <= ai, bi <= n - 1ai != biinvocations[i] != invocations[j]k.",
"Mark all the nodes visited from node k, and then check if they can be visited from the other nodes."
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"sampleTestCase": "4\n1\n[[1,2],[0,1],[3,2]]",
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