好久没有见到这种清新脱俗的算法了！
刘汝佳的白书上面有这个东西，所以基础部分就自行翻阅啦！
唯一想说的是，有一种O(M)判定是否存在解的算法：
直接求一个SCC，然后看那两个点是否在同一个SCC里即可
当然这种算法也可以求出一组可行解，
但貌似刘汝佳的算法时间勉强够用了，所以就不管了吧( •̀ ω •́ )y
好久没有见到这种清新脱俗的算法了！
刘汝佳的白书上面有这个东西，所以基础部分就自行翻阅啦！
唯一想说的是，有一种O(M)判定是否存在解的算法：
直接求一个SCC，然后看那两个点是否在同一个SCC里即可
当然这种算法也可以求出一组可行解，
但貌似刘汝佳的算法时间勉强够用了，所以就不管了吧( •̀ ω •́ )y
好文章！666，学习了
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