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…

6357. Hills And Valleys 自己感觉这是个好题,应该是经典题目,所以半路选手补了这道字符串的动态规划题目. 题意就是给你一个串,翻转任意区间一次,求最长的非下降子序列. 一看题面写的0≤Ai≤9 (i=1,2,⋯,n).就知道肯定有点东西,只要这么写,肯定就是有某个神奇的操作可以解决这道题目. 比赛的时候脑壳都要炸了也没想出来,补题的时候懂了,我可以定义一个b串为0123456789,这肯定是递增的,所以我翻转b的某个区间,然后去和a匹配,因为我把b再翻转回来,还是递增的.…

                                                                              D. Once Again... You are given an array of positive integers a1, a2, ..., an × T of length n × T. We know that for any i > n it is true that ai = ai - n. Find the length of…

题意:给一串由n个数字组成的字符串,选择其中一个区间进行翻转,要求翻转后该字符串的最长非降子序列长度最长,输出这个最长非降子序列的长度以及翻转的区间的左右端点 #include<bits/stdc++.h> using namespace std; typedef long long ll; ; ; int n, a[maxn], dp[maxn][maxm], b[maxm]; int ans, ansl, ansr, l, r, cnt; int al[maxn][maxm], ar[ma…

Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 2504    Accepted Submission(s): 616 Problem Description We are all familiar with sorting algorithms: quick sort, merge sort,…

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 array is sorted if its ele…

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 array…

Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 236    Accepted Submission(s): 113 Problem Description We are all familiar with sorting algorithms: quick sort, merge sort,…

Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 8541    Accepted Submission(s): 1982 Problem Description We are all familiar with sorting algorithms: quick sort, merge sort…

Constructing Roads In JGShining's Kingdom Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 27358    Accepted Submission(s): 7782 Problem Description JGShining's kingdom consists of 2n(n is no mor…