Everybody knows what an arithmetic progression is. Let us remind you just in case that an arithmetic progression is such sequence of numbers a1, a2, ..., an of length n, that the following cond
题意:给出一个序列b,求 b 中形如p, p - q, p, p - q, p, p - q, ... 这样出现的最长子序列的长度 (1 ≤ n ≤ 4000, 1 ≤ bi ≤ 10 ^ 6)。 题目链接:http://codeforces.com/problemset/problem/255/C ——>>状态:dp[i][j] 表示满足条件的最后两个数是 bi 和 bj 的子序列长度。。
https://blog.csdn.net/NGUever15/article/details/88821357 Understand logical progression in a paragraph 文章目录 Understand logical progression in a paragraphGeneral paragraph structureRead and Discus