Problematic test case for "Cheapest Flights Within K Stops" Leetcode problem

testcase.txt

83
[[0, 1, 100], [0, 2, 100], [0, 3, 100], [0, 4, 100], [0, 5, 100], [0, 6, 100], [0, 7, 100], [0, 8, 100], [0, 9, 100], [1, 10, 100], [1, 11, 100], [1, 12, 100], [1, 13, 100], [1, 14, 100], [1, 15, 100], [1, 16, 100], [1, 17, 100], [1, 18, 100], [2, 10, 100], [2, 11, 100], [2, 12, 100], [2, 13, 100], [2, 14, 100], [2, 15, 100], [2, 16, 100], [2, 17, 100], [2, 18, 100], [3, 10, 100], [3, 11, 100], [3, 12, 100], [3, 13, 100], [3, 14, 100], [3, 15, 100], [3, 16, 100], [3, 17, 100], [3, 18, 100], [4, 10, 100], [4, 11, 100], [4, 12, 100], [4, 13, 100], [4, 14, 100], [4, 15, 100], [4, 16, 100], [4, 17, 100], [4, 18, 100], [5, 10, 100], [5, 11, 100], [5, 12, 100], [5, 13, 100], [5, 14, 100], [5, 15, 100], [5, 16, 100], [5, 17, 100], [5, 18, 100], [6, 10, 100], [6, 11, 100], [6, 12, 100], [6, 13, 100], [6, 14, 100], [6, 15, 100], [6, 16, 100], [6, 17, 100], [6, 18, 100], [7, 10, 100], [7, 11, 100], [7, 12, 100], [7, 13, 100], [7, 14, 100], [7, 15, 100], [7, 16, 100], [7, 17, 100], [7, 18, 100], 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