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建议改一下用例啊，success了之后不应该立即输出，之后还可能有冲突，因为这个WA了好久；另外没有考虑字母不连续的情况一个需要注意的地方是拓扑路径无法唯一确定时需要继续判断是否有环，这题太bug了。。。。。。 Followed by:
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