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[Codeforces Round #668 (Div. 2)]E. Fixed Point Removal
Codeforces Round #668 (Div. 2)E. Fixed Point Removal ##题意给你一个序列a,若a[i]==ia[i] == ia[i]==i你可以删除a[i]a[i]a[i],删除后前后两部分将重新连接,序列a的权值为他能最多能删除的次数给你q个查询,每个查询给你个x,y,表示将前x个元素和后个元素变为n+1,a的权值变为了多少思路首先我们对原序列分析,要是删除的次数最多,我们肯定是优先删除i大的,口胡证明若a,b位置可删除,a<b,先删除a的会影响a.原创 2020-09-07 10:45:14 · 1131 阅读 · 0 评论 -
2020牛客多校第二场训练补题记录
2020牛客多校第二场场上解决:C,D,F已补题: A,B,G,H,J,KAll with Pairs字符串题意给你n个字符串,定义f(s,t)f(s,t)f(s,t)表示串s的前缀和t的后缀的最长匹配长度求:∑i=1n∑j=1nf(si,sj)2(mod 998244353)\sum_{i=1}^{n}\sum_{j=1}^{n}f(s_i,s_j)^2(mod\ 998244353)i=1∑nj=1∑nf(si,sj)2(mod 998244353)解法原创 2020-07-16 09:47:38 · 292 阅读 · 0 评论 -
牛客 小a的子序列
题目链接链接:https://ac.nowcoder.com/acm/contest/317/F来源:牛客网题目描述小a有一个长度为nn的序列,但是他忘了这个序列的样子,他只记得序列中的数大小在[1, V]内你可以任意选择一些位置,并给它们赋值来组成一段子序列,需要满足序列中的数严格递增一段子序列的“萌值”定义为序列中除最大数外所有数的乘积,若只有1个数则为1他想请你求出所有合法子序...原创 2019-08-16 20:33:18 · 276 阅读 · 0 评论 -
HDOJ 6651 Final Exam
题目链接Problem DescriptionFinal Exam is coming! Cuber QQ has now one night to prepare for tomorrow’s exam.The exam will be a exam of problems sharing altogether m points. Cuber QQ doesn’t know about t...原创 2019-08-12 21:24:57 · 483 阅读 · 1 评论 -
HDOJ 6659 Acesrc and Good Numbers
题目地址Problem DescriptionAcesrc is a famous mathematician at Nanjing University second to none. Playing with interesting numbers is his favorite. Today, he finds a manuscript when cleaning his room, w...原创 2019-08-16 11:23:06 · 236 阅读 · 0 评论 -
HDOJ 6624 fraction
题目链接Problem DescriptionMany problems require printing the probability of something. Moreover, it is common that if the answer is ab, you should output a×b−1(modp) (p is a prime number). In these pro...原创 2019-08-06 11:35:41 · 156 阅读 · 0 评论 -
HDOJ 6620 Just an Old Puzzle
Problem DescriptionYou are given a 4 × 4 grid, which consists of 15 number cells and an empty cell.All numbers are unique and ranged from 1 to 15.In this board, the cells which are adjacent with th...原创 2019-08-01 13:06:34 · 255 阅读 · 0 评论 -
HDOJ 6623 Minimal Power of Prime
Problem DescriptionYou are given a positive integer n > 1. Consider all the different prime divisors of n. Each of them is included in the expansion n into prime factors in some degree. Required t...原创 2019-08-01 11:00:32 · 157 阅读 · 0 评论 -
HDOJ 6609 Find the answer
题目链接Problem DescriptionGiven a sequence of n integers called W and an integer m. For each i (1 <= i <= n), you can choose some elements Wk (1 <= k < i), and change them to zero to make ∑...原创 2019-07-30 18:18:09 · 243 阅读 · 0 评论 -
HDOJ 4800 Josephina and RPG
var foo =‘bar’#include<bits/stdc++.h>#define ll long long#define mod 1000003using namespace std;//const double pi=atan(1)*4;int m,n;float t[200][200];int id[10005];int c[11]={0,0,0,1,4,...原创 2019-07-26 17:34:38 · 305 阅读 · 0 评论 -
HDOJ 4793 Collision
题目链接//http://acm.hdu.edu.cn/showproblem.php?pid=4793Problem DescriptionThere’s a round medal fixed on an ideal smooth table, Fancy is trying to throw some coins and make them slip towards the medal ...原创 2019-07-26 21:11:58 · 158 阅读 · 0 评论 -
HDOJ 4810 Wall Painting
Problem DescriptionMs.Fang loves painting very much. She paints GFW(Great Funny Wall) every day. Every day before painting, she produces a wonderful color of pigments by mixing water and some bags of...原创 2019-07-27 14:39:24 · 344 阅读 · 0 评论 -
HDOJ 6608 Fansblog
题目链接Problem DescriptionFarmer John keeps a website called ‘FansBlog’ .Everyday , there are many people visited this blog.One day, he find the visits has reached P , which is a prime number.He thinks...原创 2019-07-30 12:19:57 · 258 阅读 · 0 评论