2019 Multi-University,HDU Day 4
Revision as of 10:34, 31 July 2019 by Xiejiadong (talk | contribs) (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...")
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.
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)