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一道好题，要常做常新。当中犯了两个错误： 1. 对于[["JFK","KUL"],["JFK","NRT"],["NRT","JFK"]]，会有这样的错误： ["JFK","KUL","NRT","JFK"] 2. 对于sjc，是没有queue的，所以必须判断queue为空的情况 public class Solution {List<String> res = new Linke