传送门 只会爆搜系列 关于「本质不同的子序列个数」:限定长度,无限制(就是这题) 无限制的柿子是(令 \(dp[i]\) 为以 \(i\) 为结尾的不同子序列个数) \(dp[i] = \sum dp[j]+1\),代表在所有子序列末尾后面接上这个字母,且它自身也是一个子序列 然后这题还可以填上 \(m\) 个数,并要求最大化方案数 有个我没想到的贪心,每次填方案数最少的那个字母 因为根据上面的转移,无论这一次选哪个字母,它们的dp值都是一样的 于是发现我们填的数其实是 \(k\) 的一个排列…

[CF486E]LIS of Sequence题解 题目链接 题意: 给你一个长度为n的序列a1,a2,...,an,你需要把这n个元素分成三类:1,2,3: 1:所有的最长上升子序列都不包含这个元素 2:有但非所有的最长上升子序列包含这个元素 3:所有的最长上升子序列都包含这个元素 输入格式: 第一行包含一个正整数n,表示序列的长度.第二行包含n个正整数a1,a2,...,an,表示序列中的元素. 输出格式: 一行,包含一个长度为n的.由1,2,3三种数字组成的字符串,第i个数字表示ai所属类…

题面 D. The Child and Sequence time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output At the children's day, the child came to Picks's house, and messed his house up. Picks was angry at him. A lot…

DNA sequence Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3503    Accepted Submission(s): 1681 Problem Description The twenty-first century is a biology-technology developing century. We kn…

[题解]Cut the Sequence(贪心区间覆盖) POJ - 3017 题意: 给定一大堆线段,问用这些线段覆盖一个连续区间1-x的最小使用线段的数量. 题解 考虑一个这样的贪心: 先按照左端点排序,若左端点一样则谁长谁在前.现在判无解就方便了,记录一下前缀max即可.然后现在要最小化选择. 记录一个最右端点\(R\),一个暴力的办法是暴力循环判断所有线段是否满足条件,这样显然超时,你决定优化一下常数,所以你记录一下从哪个线段开始才\(l_i \ge R\).你以为你是常数优化,其实你复…

目录 Ural 1248 Sequence Sum 题解 题意 题解 程序 Ural 1248 Sequence Sum 题解 题意 给定\(n\)个用科学计数法表示的实数\((10^{-100}\sim10^{100})\),输出它们的和. Tip: 一个实数可以用科学计数法表示为\(x\times10^y\),其中\(1\le x<10\) \(x\)为实数,\(y\)是整数.输入时表示为\(xey\).保证输入的实数有\(19\)位有效数字.输出时用科学计数法,必须包括\(19\)位正确数…

题目描述 At the children's day, the child came to Picks's house, and messed his house up. Picks was angry at him. A lot of important things were lost, in particular the favorite sequence of Picks. Fortunately, Picks remembers how to repair the sequence.…

题目 This is yet another problem on regular bracket sequences. A bracket sequence is called regular, if by inserting "+" and "1" into it we get a correct mathematical expression. For example, sequences "(())()", "()"…

The only difference between the easy and the hard versions is the maximum value of \(k\). You are given an infinite sequence of form "112123123412345-" which consist of blocks of all consecutive positive integers written one after another. The f…

题目来源 https://leetcode.com/problems/permutation-sequence/ The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order,We get the following sequence (ie, for n = 3): "123" "132"…