2018 Multi-University, Nowcoder Day 1
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数数题超多。
zerol 和 kblack 负责做难题,ultmaster 负责找规律和使用搜索引擎。
Problem A
Solved by ultmaster. 02:39 (+)
题意:往 $n \times m$ 的格子里填 0,1,2,求左边比右边小,上面比下面小的填法数量。
题解:找规律。
Problem B
Solved by ultmaster. 03:43 (+)
题意:见题解中的样例。
题解:OEIS A002137。
Problem D
Solved by ultmaster. 00:59 (+)
题意:求把 $G_2$ 删掉某些边后和 $G_1$ 同构的不同的边集的数量。
题解:暴力枚举排列,然后映射,然后把要删掉的边组成位向量扔进集合。由于点数很小,位向量居然用 int 就够了。
Problem E
Solved by ultmaster. 00:23 (+)
题意:求把一个数列删除恰好 $m$ 元素之后有多少种不同的结果数列。
题解:CCCC 原题。
Problem F
Solved by zerol. 00:52 (+)
Problem H
Upsolved by zerol. 04:59 (-5)
Problem I
Solved by zerol. 01:25 (+)
Problem J
Solved by kblack. 00:21 (+)