Sequence I Problem Description   Mr. Frog has two sequences a1,a2,⋯,an and b1,b2,⋯,bm and a number p. He wants to know the number of positions q such that sequence b1,b2,⋯,bmis exactly the sequence aq,aq+p,aq+2p,⋯,aq+(m−1)p where q+(m−1)p≤n and q≥1.…

题目来源:2016 CCPC 长春站 题意:给出两个序列 a[] , b[] ,如果b1,b2....bm能够与aq,aq+p,aq+2p...aq+(m-1)p对应( q+(m-1)p<=n && q>=1 ),则q为一个合法的数,找出满足题意的q的个数 思路:简单KMP,枚举起点q,如果匹配成功后记录一次然后重新从最后匹配位置进行匹配,一直匹配到a[]结束 /**********************************************************…

HDU 3397 Sequence operation 题目链接 题意:给定一个01序列,有5种操作 0 a b [a.b]区间置为0 1 a b [a,b]区间置为1 2 a b [a,b]区间0变成1,1变成0 3 a b 查询[a,b]区间1的个数 4 a b 查询[a,b]区间连续1最长的长度 思路:线段树线段合并.须要两个延迟标记一个置为01,一个翻转,然后因为4操作,须要记录左边最长0.1.右边最长0.1,区间最长0.1,然后区间合并去搞就可以 代码: #include <cstdi…

Time Limit: 3000/1500 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 706 Accepted Submission(s): 266 Problem Description Mr. Frog has two sequences a1,a2,⋯,an and b1,b2,⋯,bm and a number p. He wants to know the number…

给定两个数字序列,求a序列中每隔p个构成的p+1个序列中共能匹配多少个b序列. 例如1 1 2 2 3 3 每隔1个的序列有两个1 2 3 kmp,匹配时每次主串往前p个,枚举1到p为起点. 题目 #include<bits/stdc++.h> #define N 1000005 int t,n,m,p; int nex[N]; int a[N],b[N]; using namespace std; void getNext(){ int i=0,k=-1; nex[0]=k; while(b…

Sequence II Time Limit: 9000/4500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 1422    Accepted Submission(s): 362 Problem Description Mr. Frog has an integer sequence of length n, which can be denoted as a1,a2…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5146 Sequence Description Today we have a number sequence A includes n elements.Nero thinks a number sequence A is good only if the sum of its elements with odd index equals to the sum of its elements wi…

任意门:http://acm.hdu.edu.cn/showproblem.php?pid=6395 Sequence Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 2564    Accepted Submission(s): 999 Problem Description Let us define a sequence as…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5312 Sequence Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 1336    Accepted Submission(s): 410 Problem Description Today, Soda has learned a…

Number Sequence Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 15149    Accepted Submission(s): 6644 Problem Description Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3397 题意:给你一个长度为n的0,1序列,支持下列五种操作, 操作0(0 a b):将a到b这个区间的元素全部置为0. 操作1(1 a b):将a到b这个区间的元素全部置为1. 操作2(2 a b):将a到b这个区间所有的0置为1,所有的1置为0. 操作3(3 a b):查询a到b这个区间1的总数. 操作4(4 a b):查询a到b这个区间连续1的最长长度 本题属于简单的区间更新线段树 重点:0操作…

题目链接 http://poj.org/problem?id=1141 Description Let us define a regular brackets sequence in the following way: 1. Empty sequence is a regular sequence. 2. If S is a regular sequence, then (S) and [S] are both regular sequences. 3. If A and B are reg…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1711 数字KMP,原来还能这么用 #include<stdio.h> ],b[]; ]; int n,m; void getNext() { int j,k; j=; k=-; next[]=-; while(j<m) { ||b[j]==b[k]) next[++j]=++k; else k=next[k]; } } //返回首次出现的位置 int KMP_Index() { ,j=; g…

Sequence II Problem Description   Mr. Frog has an integer sequence of length n, which can be denoted as a1,a2,⋯,an There are m queries. In the i-th query, you are given two integers li and ri. Consider the subsequence ali,ali+1,ali+2,⋯,ari. We can de…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3998 解题报告:求一个数列的最长上升子序列,并求像这样长的不相交的子序列最多有多少个. 我用的是最简单的方法,就是每次求最长上升子序列,然后每次将求得的子序列从数列里面删掉,然后再对剩下的数列求最长上升子序列,如果求得的子序列的长度比第一次求得的长度小的话,就退出.不过我这题卡了很久,原因就是因为用这种方法求的过程中,用到了很多变量,但是没有注意每一步求最长上升子序列的时候都要进行初始化,哎.…

Sequence I Time Limit: 3000/1500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1013    Accepted Submission(s): 393 Problem Description Mr. Frog has two sequences a1,a2,⋯,an and b1,b2,⋯,bm and a number p. He wants t…

Sequence operation Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4952    Accepted Submission(s): 1452 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1…

http://acm.hdu.edu.cn/showproblem.php?pid=5147 题意:问有多少个这样的四元组(a,b,c,d),满足条件是 1<=a<b<c<d; Aa<Ab; Ac<Ad; 思路:用树状数组求,从右向左求在这个数之前形成多少个逆序数对记录在r数组里面,然后在从左向右求出在输入这个数之前形成多少个逆序数对存在l数组里面,然后枚举b就行: #include <cstdio> #include <cstring> #in…

Problem Description Today, Soda has learned a sequence whose n-th (n≥) item )+. Now he wants to know if an integer m can be represented as the sum of some items of that sequence. If possible, what are the minimum items needed? For example, =+++=+++.…

[题目链接]http://acm.hdu.edu.cn/showproblem.php?pid=5919 [题目大意] 给出一个数列,每次查询数列中,区间非重元素的下标的中位数.查询操作强制在线. [题解] 因为查询的是下标,因此,我们直接在下标操作表示这里有没有数字,然后查询k大数即可,非重元素即需要在区间每个数第一次出现的地方+1,然后对处理完的区间进行查询即可,考虑到查询强制在线,不能扫描线,因此只能建立可持久化线段树,线段树的第i个版本表示第i个位置往后的每个元素第一次出现的位置,那么查…

这道题目的题意就是使用题目中所给的Gate 函数,模拟出输入的结果 当然我们分析的时候可以倒着来,就是拿输入去减 每次Gate 函数都会有一个有效范围 这道题目求的就是,找出一种模拟方法,使得最小的有效范围最大化. 是一道[贪心]题 参考了https://github.com/boleynsu/acmicpc-codes 的做法 b 数组中存放是 Sequence 的下标 这是一个O(n)的算法 if (a[i-1]<a[i]){ int k=a[i]-a[i-1]; while (k--) b…

Problem Description lxhgww got a sequence contains n characters which are all '0's or '1's. We have five operations here: Change operations: 0 a b change all characters into '0's in [a , b] 1 a b change all characters into '1's in [a , b] 2 a b chang…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=3397 题意: 给你一串01串,有5种操作 0. 区间全部变为0 1.区间全部变为1 2.区间异或 3.询问区间1的个数 4.询问区间被最长连续1的长度 思路: 这5个操作都是比较基础的线段树操作,难点在于有两种修改操作,这类题之前也写过,之前是乘法和加法,这个是区间亦或和区间更新值,但是思路是可以借鉴的,我们要推出这两个操作的关系,这样才能维护好这两个标记,我们用两个标记:same , rev ,分别表…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=5919 大致题意: 给你一个长度为n的序列,q个询问,每次询问是给你两个数x,y,经过与上一次的答案进行运算会得到一个区间[x,y],假设这个区间内有k个数,对k个数第一次出现的位置进行排序取第(k+1)/2个数. 思路: 看题意可知要求的是区间不同数的个数和区间第k小,强制在线, 之前正好写过求区间不同数的个数的三种解法:离线树状数组,主席树,莫队,因为这道题是强制在线,莫队和离线树状数组都不能用,这里…

http://acm.split.hdu.edu.cn/showproblem.php?pid=5919 题意:给出一串序列,每次给出区间,求出该区间内不同数的个数k和第一个数出现的位置(将这些位置组成一个新的序列),输出这里面的第ceil(k/2)个数. 思路: 因为每个区间只需要统计第一个数出现的位置,那么从右往左来建树,如果该数没有出现,那么就将该位置+1,否则要将上一次出现的位置-1后再在该位置+1. 统计不同数的个数很简单,就是线段树查询. 查询出第k小的数也很简单,因为我们是从后往前…

Sequence I Time Limit: 3000/1500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 216    Accepted Submission(s): 93 Problem Description Mr. Frog has two sequences a1,a2,⋯,an and b1,b2,⋯,bm and a number p. He wants to…

Problem Description Holion August will eat every thing he has found. Now there are many foods,but he does not want to eat all of them at once,so he find a sequence. fn=⎧⎩⎨⎪⎪1,ab,abfcn−1fn−2,n=1n=2otherwise He gives you 5 numbers n,a,b,c,p,and he will…

Recursive sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1525    Accepted Submission(s): 710 Problem Description Farmer John likes to play mathematics games with his N cows. Recently,…

Sequence II Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description Long long ago, there is a sequence A with length n. All numbers in this sequence is no smaller than 1 and no bigger than n, and all nu…

题目链接:pid=3397">http://acm.hdu.edu.cn/showproblem.php?pid=3397 题意:给定n个数,由0,1构成.共同拥有5种操作. 每一个操作输入3个数,op,a.b. op == 0.将区间[a,b]赋值为0. op == 1,将区间[a,b]赋值为1: op == 2.将区间[a.b]内的01反转: op == 3.查询区间[a.b]中1的个数. op == 4,查询区间[a.b]中连续1的最大长度. 思路:区间合并 + 区间更新. 每一个结…