题目描述: class Solution: def longestSubsequence(self, arr: List[int], difference: int) -> int: dp = dict() for a in arr: pre = a - difference if pre in dp: dp[a] = max(dp.get(a, 0), dp[pre] + 1) else: dp[a] = 1 return max([x for _, x in dp.items()]) 优化:
Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000. Example 1:Input: "bbbab" Output: 4 One possible longest palindromic subsequence is "bbbb". Example 2:Input:
阅读下面程序,请回答如下问题: 问题1:这个程序要找的是符合什么条件的数? 问题2:这样的数存在么?符合这一条件的最小的数是什么? 问题3:在电脑上运行这一程序,你估计多长时间才能输出第一个结果?时间精确到分钟(电脑:单核CPU 4.0G Hz,内存和硬盘等资源充足). 问题4:在多核电脑上如何提高这一程序的运行效率? (注:该程序.用C#语言编写,但是只要有C语言基础完全没有阅读压力,如果对部分语句不懂请自行查询) 要求:将上述问题结果写到博客上. using System; using Sy
题目链接 Problem Description We are all familiar with sorting algorithms: quick sort, merge sort, heap sort, insertion sort, selection sort, bubble sort, etc. But sometimes it is an overkill to use these algorithms for an almost sorted array. We say an a