LeetCode 446. Arithmetic Slices II - Subsequence - Mr.Phoebe的专栏 - CSDN博客



LeetCode 446. Arithmetic Slices II - Subsequence - Mr.Phoebe的专栏 - CSDN博客

一道长得一副dp的样子的dp题。

这道题难度不算特别大,因为看得出来肯定是dp题。因为,一个等差序列里面有好几个小的等差序列。
例如,2 4是一个等差序列,2 4 6是一个等差序列。
所以我们发现等差序列是可以扩展的。

那么就得到了,咱们的转移方程的一部分

dp[i][delta]=dp[j][delta]+1

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