2017-2018 ACM-ICPC, Asia Tsukuba Regional Contest

Posted 2021-01-26 amadeus

地址

Rank	Solved	A	B	C	D	E	F	G	H	I	J	K
16/160	27/130	O	O	O	.	O	O	?	.	O	.	?

O: 当场通过

?: 赛后通过

.: 尚未通过

A Secret of Chocolate Poles

solved by chelly

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chelly‘s solution

B Parallel Lines

solved by ch

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ch‘s solution

C Medical Checkup

solved by chelly

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chelly‘s solution

D Digital Clock

unsolved

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E Black or White

solved by chelly&ch

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chelly‘s solution

F Pizza Delivery

solved by chelly&ch

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chelly‘s solution

G Rendezvous on a Tetrahedron

upsolved by feynman

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feynman‘s solution

H Homework

unsolved

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I Starting a Scenic Railroad Service

solved by chelly

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chelly‘s solution

J String Puzzle

unsolved

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K Counting Cycles

upsolved by chelly

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chelly‘s solution

先求出一棵生成树，那么非树边顶多16条，二进制枚举所有的组合，算经过某几条非树边是否存在一个环（如果存在则一定是唯一的）
对于如何判断，只需要将一个非树边对应的树上的链全部异或一下，那么对于这组选择，选出边权为1的边组成一个图，判断这个图是不是一个简单环即可
注意原树会很大，(2^16)次遍历原树是会TLE，我们只需要在虚树上做即可

Dirt Replay

F -1 双连通分量的板子抄错了

E -3 一发是dp式子写错了，还有两发是因为单调队列优化时候的单调队列方向写反了