![\"\"](\"https://assets.leetcode.com/uploads/2019/05/23/931_example_1.png\")
You are given a network of n nodes, labeled from 1 to n. You are also given times, a list of travel times as directed edges times[i] = (ui, vi, wi), where ui is the source node, vi is the target node, and wi is the time it takes for a signal to travel from source to target.
We will send a signal from a given node k. Return the minimum time it takes for all the n nodes to receive the signal. If it is impossible for all the n nodes to receive the signal, return -1.
\n
Example 1:
\n\n\nInput: times = [[2,1,1],[2,3,1],[3,4,1]], n = 4, k = 2\nOutput: 2\n\n\n
Example 2:
\n\n\nInput: times = [[1,2,1]], n = 2, k = 1\nOutput: 1\n\n\n
Example 3:
\n\n\nInput: times = [[1,2,1]], n = 2, k = 2\nOutput: -1\n\n\n
\n
Constraints:
\n\n1 <= k <= n <= 1001 <= times.length <= 6000times[i].length == 31 <= ui, vi <= nui != vi0 <= wi <= 100(ui, vi) are unique. (i.e., no multiple edges.)有 n 个网络节点，标记为 1 到 n。
给你一个列表 times，表示信号经过 有向 边的传递时间。 times[i] = (ui, vi, wi)，其中 ui 是源节点，vi 是目标节点， wi 是一个信号从源节点传递到目标节点的时间。
现在，从某个节点 K 发出一个信号。需要多久才能使所有节点都收到信号？如果不能使所有节点收到信号，返回 -1 。
\n\n
示例 1：
\n\n
\n输入：times = [[2,1,1],[2,3,1],[3,4,1]], n = 4, k = 2\n输出：2\n\n\n
示例 2：
\n\n\n输入：times = [[1,2,1]], n = 2, k = 1\n输出：1\n\n\n
示例 3：
\n\n\n输入：times = [[1,2,1]], n = 2, k = 2\n输出：-1\n\n\n
\n\n
提示：
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