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原创取子集

#include#include#includeusing namespace std;void print(int n){ for(int i=0;(1<<i)<=n;i++) if(n&(1<<i)) cout<<1; else cout<<0; cout<<endl;}int main(){ i

2014-09-09 15:47:04 988

原创 kmp的简单理解

参考的是：http://www.matrix67.com/blog/archives/115kmp算法就是

2014-08-03 19:30:42 964

原创数位dp专辑

1.题目链接：codeforces 55D【题意】一个数能被它每一位的数字整除(0除外)则为beautiful number ,问[l,r]之间有多少个这样的数【思路】考虑到每一位的数字只能是1,2，，9，最小公倍数为2520. 设数w=x*2520+y，每位数字的最小公倍数为mul,则w%mul=(x*2520+y)%mul=x*2520%mul+y%mul=y%mul

2015-07-17 18:02:21 546

原创 codeforces 149d Coloring Brackets

Coloring Bracketstime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputOnce Petya read a problem about a bracket sequence. H

2015-07-10 20:00:29 606

原创 poj 2955

BracketsTime Limit: 1000MS Memory Limit: 65536KTotal Submissions: 3961 Accepted: 2085DescriptionWe give the following inductive definition of a “regular brackets”

2015-07-10 19:52:05 662

原创 LightOJ 1422 Halloween Costumes (区间dp)

1422 - Halloween Costumes PDF (English)StatisticsForumTime Limit: 2 second(s)Memory Limit: 32 MBGappu has a very busy weekend ahead of him. Beca

2015-07-10 19:30:53 814

转载树状数组

转自http://hawstein.com/posts/binary-indexed-trees.html#findind树状数组(Binary Indexed Trees)November 15, 2012作者：Hawstein出处：http://hawstein.com/posts/binary-indexed-trees.html声明：本文采用以下协议进行

2014-08-21 08:59:31 860

原创 poj 2486 Apple Tree

题目：http://poj.org/problem?id=2486【题意】：给一棵树，每个节点上有一些苹果，根节点编号为1，从根节点开始走，一共走K步（一步走一条边），问最多能吃到多少苹果【思路】：dp~~ 这个题的状态设置有多种方法,此题有一个特性，即：对于每一种走法，所走子树的顺序不影响最终的结果①dp[i][j][0/1],以i为根节点，最多可以走j步最后回到（即1）i点，最多

2014-08-20 14:32:09 638

原创 poj 1185 炮兵阵地

题目连接：http://poj.org/problem?id=1185

2014-08-18 15:46:21 631

原创 poj 3034 Whac-a-Mole(dp)

题目：http://poj.org/problem?id=3034

2014-08-15 16:39:27 703

原创 poj 1159 Palindrome

PalindromeTime Limit: 3000MS Memory Limit: 65536KTotal Submissions: 52716 Accepted: 18187DescriptionA palindrome is a symmetrical string, that is, a string read i

2014-08-13 08:28:57 601

原创 ac 自动机

/*ac自动机=kmp+trie与kmp的思想是一样的，不过实现起来就有相当多的细节问题了。1.建立字典树是必须的，ch[i][j],i是节点编号，j是儿子。每一个节点都隐含有MAX_SIZE个儿子的指针，0表示该儿子不存在，其他值表示她的位置2.算出失配边，对于ch[i][j]!=0的处理方法与kmp中是相同的。但对于ch[i][j]=0的处理有两种，①不处理，直

2014-08-11 20:41:54 575

原创 hdu 2222(Keywords Search) (AC自动机)

Keywords SearchTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 34147 Accepted Submission(s): 11061Problem DescriptionIn the m

2014-08-11 13:55:22 628

原创 poj 1330 Nearest Common Ancestors

Nearest Common AncestorsTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 17879 Accepted: 9492DescriptionA rooted tree is a well-known data structure in c

2014-08-06 21:37:03 557

原创 poj 1094 Sorting It All Out(拓扑排序)

Sorting It All OutTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 27572 Accepted: 9546DescriptionAn ascending sorted sequence of distinct values is one

2014-08-06 14:46:23 730

原创 hdu 1867 A + B for you again

A + B for you againTime Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4214 Accepted Submission(s): 1077Problem DescriptionGenera

2014-08-04 08:41:42 690

原创 hdu 1422 重温世界杯

重温世界杯Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 4370 Accepted Submission(s): 1492Problem Description世界杯结束了,意大利人连本带利的收回了法

2014-08-01 07:41:17 829

原创 poj 1821 Fence(dp+单调队列优化)

FenceTime Limit: 1000MS Memory Limit: 30000KTotal Submissions: 3485 Accepted: 1047DescriptionA team of k (1 <= K <= 100) workers should paint a fence which contai

2014-07-20 16:28:12 3254 2

原创 poj 1080 Human Gene Functions(dp)

Human Gene FunctionsTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 16748 Accepted: 9295DescriptionIt is well known that a human gene can be considered

2014-06-10 23:41:06 789

原创 poj 1019 Number Sequence(dp+二分)

Number SequenceTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 33439 Accepted: 9559DescriptionA single positive integer i is given. Write a program to f

2014-06-10 10:47:15 741

原创 poj 1088 滑雪

滑雪Time Limit: 1000MS Memory Limit: 65536KTotal Submissions: 73837 Accepted: 27295DescriptionMichael喜欢滑雪百这并不奇怪，因为滑雪的确很刺激。可是为了获得速度，滑的区域必须向下倾斜，而且当你滑到坡底，你不得不再次走上坡或者等

2014-06-07 22:40:58 604

原创 poj 1050 To the Max

To the MaxTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 39768 Accepted: 21017DescriptionGiven a two-dimensional array of positive and negative integer

2014-06-05 16:48:18 591

原创 poj 1018Communication System

Communication SystemTime Limit: 1000MS Memory Limit: 10000KTotal Submissions: 22559 Accepted: 8037DescriptionWe have received an order from Pizoor Communications

2014-06-05 15:16:18 748

原创最大连续子序列

最大连续子序列Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 17920 Accepted Submission(s): 7927Problem Description给定K个整数的序列{ N1, N2

2014-05-22 20:36:45 533

原创最长公共子序列,最大递增子序列，最长公共递增子序列

Common SubsequenceTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 21529 Accepted Submission(s): 9351Problem DescriptionA subs

2014-05-22 18:14:56 693

原创用梯形法,矩形法,辛普生法,变步长梯形法,求积分

用梯形法,矩形法,辛普生法,变步长梯形法,求积分

2014-05-22 16:36:21 5285

原创 Codeforces Round #247 (Div. 2)a.Black Square,b.Shower Line,c.k-Tree前三题

题目链接a.Black Squarehttp://codeforces.com/contest/431/problem/A

2014-05-22 13:44:42 977

原创用邻接表实现spfa

1 2 3

2014-05-07 21:12:12 1384

原创 hdu 2717 (poj 3278)Catch That Cow

水的bfs,坑爹的是vis没初始化，poj上过了

2014-05-06 18:00:05 865

原创 hdu 1424 Rescue

RescueTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 14408 Accepted Submission(s): 5225Problem DescriptionAngel was caught b

2014-05-05 23:28:03 904

原创 Codeforces Round #244 (Div. 2)E. Police Patrol

一开始以近乎枚举defangshi

2014-05-03 10:40:35 2627

原创 Codeforces Round #244 (Div. 2)B Prison Transfer

题意：找连续的c个数，最大不超过的

2014-05-03 01:54:01 832

原创 Codeforces Round #244 (Div. 2)a Police Recruits

A. Police Recruitstime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputThe police department of your city has ju

2014-05-03 01:43:40 1066

原创 hdu 3183 A Magic Lamp

题意：一串数字，删去m个数字，输出

2014-05-01 01:17:23 665

原创 hdu Calculator 3546

CalculatorTime Limit: 2000/2000 MS (Java/Others) Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 1398 Accepted Submission(s): 346Problem DescriptionGolden Adobe is

2014-04-28 18:53:29 848