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https://missterhao.me/2019/01/04/%e3%80%90cpe%e3%80%91uva-299-train-swapping-%e4%b8%80%e9%a1%86%e6%98%9f-by-python-3-6/
【CPE】UVA 299 Train Swapping 一顆星 by Python 3.6