Difference between revisions of "2019 Multi-University,HDU Day 4"

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(Created page with "== Problem A == Solved by Kilo_5723. 00:12:16 (+1) 题面实在太难读了。 == Problem B == Unsolved. == Problem C == Unsolved. (-3) == Problem D == Unsolved. == P...")
 
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Solved by Kilo_5723. 00:12:16 (+1)
 
Solved by Kilo_5723. 00:12:16 (+1)
 
题面实在太难读了。
 
  
 
== Problem B ==
 
== Problem B ==

Revision as of 10:34, 31 July 2019

Problem A

Solved by Kilo_5723. 00:12:16 (+1)

Problem B

Unsolved.

Problem C

Unsolved. (-3)

Problem D

Unsolved.

Problem E

Unsolved.

Problem F

Unsolved.

Problem G

Solved by Xiejiadong && Weaver_zhu. 02:45:41 (+1)

题意:判断十五数码问题是否无解。

题解:在 Xiejiadong 的强行误导下, Weaver_zhu 写了两个小时 A* 。

直接大力猜结论,大概模拟一下 $0$ 位置的变动。

根据 $0$ 所在位置的行列奇偶性和分行和列的逆序对数量奇偶行相同即可。

Problem H

Solved by Xiejiadong. 01:23:54 (+)

Problem I

Unsolved.

Problem J

Solved by Kilo_5723 && Xiejiadong. 04:09:28 (+1)