题意:There is a sequence of integers. Your task is to find the longest subsequence that satisfies the following condition: the difference between the maximum element and the minimum element of the subsequence is no smaller than m and no larger than k.…

题意是说给出一个序列,现在要求出这个序列的一个最长子区间,要求子区间的最大值与最小值的差在[m, k]范围内,求区间长度 做法是维护两个队列,一个维护到当前位置的最大值,一个维护最小值,然后计算当前节点i作为右端点的最常区间长度,那么扫描两个队列,维持单调性. 然后比较两个队列头的差值, 1.如果差值满足条件,那么记录答案: 2.如果差值小于m,那么此时没有答案,说明没有以i作为右端点的区间满足条件(表示前i个数的最大值减去前i个数的最小值的差<m,那么不论如何调整起点,都不可能有解) 3.如果…

题意:求在一段序列中满足m<=max-min<=k的最大长度. 解题关键:单调队列+dp,维护前缀序列的最大最小值,一旦大于k,则移动左端点,取max即可. #include<cstdio> #include<cstring> #include<algorithm> #include<cstdlib> #include<iostream> #include<cmath> #define maxn 1000005 using…

Subsequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 6141    Accepted Submission(s): 2041 Problem Description There is a sequence of integers. Your task is to find the longest subsequence…

题目链接 传送门 题面 题意 找到最长的一个区间,使得这个区间内的最大值减最小值在\([m,k]\)中. 思路 我们用两个单调队列分别维护最大值和最小值,我们记作\(q1\)和\(q2\). 如果\(q1\)的底部的值与\(q2\)的底部的值大于\(k\),则将\(q1,q2\)底部中下标最小的\(pop\)掉,并记录下来,记作\(tmp\),如果\(q1,q2\)底部的值大于等于\(m\)则更新答案\(ans = max(ans,i-tmp)\). 代码实现如下 #include <set>…

A sequence of numbers is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the same. For example, these are arithmetic sequences: 1, 3, 5, 7, 9 7, 7, 7, 7 3, -1, -5, -9 The follo…

Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case English letters in both s and t. t is potentially a very long (length ~= 500,000) string, and s is a short string (<=100). A subsequence of…

A sequence of numbers is called a wiggle sequence if the differences between successive numbers strictly alternate between positive and negative. The first difference (if one exists) may be either positive or negative. A sequence with fewer than two…

Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formally the function should: Return true if there exists i, j, k such that arr[i] < arr[j] < arr[k] given 0 ≤ i < j < k ≤ n-1 else return…

Given an unsorted array of integers, find the length of longest increasing subsequence. For example, Given [10, 9, 2, 5, 3, 7, 101, 18], The longest increasing subsequence is [2, 3, 7, 101], therefore the length is 4. Note that there may be more than…