Asia Yokohama Regional Contest 2018

Problem A

Solved by zerol. 00:33 (+)

Problem B

Solved by ultmaster. 01:09 (+)

题意：从一个集合里选一些数使得构成等差数列最长。

题解：d[i][j] 表示到 i，上一个是 j，最长是多少。转移的时候在一个 map 里反查一下，就是 $O(n^2 \log n)$ 了。

Problem C

Solved by zerol. 01:39 (+1)

Problem D

Solved by kblack. 02:34 (+)

Problem E

Unsolved. (-2)

Problem F

Unsolved.

Problem G

Solved by kblack. 02:56 (+)

Problem H

Unsolved.

Problem I

Unsolved.

Problem J

Unsolved.

Problem K

Unsolved.