Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 1459    Accepted Submission(s): 413 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…

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…

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…

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,…

给出一个序列(长度>=2),问去掉一个元素后是否能成为单调不降序列或单调不增序列. 对任一序列,先假设其可改造为单调不降序列,若成立则输出YES,不成立再假设其可改造为单调不增序列,若成立则输出YES,不成立则输出NO. 由于持平不影响整体单调性,为了直观,我在以下把“不降”称为“递增/升序”,把“不增”称为“递减/降序”. 递增和递减是对称的,这里先考虑递增,递减改个符号和最值就好. 我们把为维护单调性而去掉的那个点称为“坏点”.由题目的要求,“可改造”可等价于“只存在一个坏点”. 对于“坏点…

http://acm.hdu.edu.cn/showproblem.php?pid=5532  题目大意: 给你一个不规则的序列,问是否能够通过删除一个元素使其成为一个有序的序列(递增或递减(其中相邻的元素可以相等))   将序列里分成两种可能讨论,该序列除了一个元素之外要么递增要么递减,只需满足一个即可   #include<stdio.h> #include<math.h> #include<string.h> #include<stdlib.h> #i…

题目大意:给一个n个数的序列,问这个序列删掉一个数后是否有序. 题目分析:找最长上升子序列和最长下降子序列,只要有一个的长度不小于n-1即可. 代码如下: # include<iostream> # include<cstdio> # include<cmath> # include<vector> # include<list> # include<queue> # include<map> # include<s…