Ponds                                   Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)                                        Problem Description Betty owns a lot of ponds, some of them are connected with other…

Elven Postman Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 591    Accepted Submission(s): 329 Problem Description Elves are very peculiar creatures. As we all know, they can live for a very…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=5441 题意:给你n,m,k,代表n个城市,m条边,k次查询,每次查询输入一个x,然后让你一个城市对(u,v)满足两点之间每一条边都不超过x,问有多少对 思路:首先我想到的是dfs求出每个查询小于等于他的一个连通块,然后num*(num-1)就是答案,但是时间只有一秒,这个复杂度是5*1e8,超时了(亲身体验了) 然后我们想这个是离线的,我们可不可以由小到大来推,这样前面的贡献到后面就依然能用了,但是我们…

http://acm.hdu.edu.cn/showproblem.php?pid=5441 Travel Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 2061    Accepted Submission(s): 711 Problem Description Jack likes to travel around the wo…

http://acm.hdu.edu.cn/showproblem.php?pid=5444 Elven Postman Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 939    Accepted Submission(s): 520 Problem Description Elves are very peculiar crea…

Problem Description Elves are very peculiar creatures. As we all know, they can live for a very long time and their magical prowess are not something to be taken lightly. Also, they live on trees. However, there is something about them you may not kn…

链接: http://acm.hdu.edu.cn/showproblem.php?pid=5443 The Water Problem Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 738    Accepted Submission(s): 591 Problem Description In Land waterless, w…

题目链接: Hdu 5442 Favorite Donut 题目描述: 给出一个文本串,找出顺时针或者逆时针循环旋转后,字典序最大的那个字符串,字典序最大的字符串如果有多个,就输出下标最小的那个,如果顺时针和逆时针的起始下标相同,则输出顺时针. 解题思路: 看到题目感觉后缀数组可以搞,正准备犯傻被队友拦下了,听队友解释一番,果断丢锅给队友.赛后试了一下后缀数组果然麻烦的不要不要的(QWQ),还是最大最小表示法 + KMP来的干净利索. 最大表示法:对于一个长度为len文本串,经过循环旋转得到长度…

题目链接: Hdu 5446 Unknown Treasure 题目描述: 就是有n个苹果,要选出来m个,问有多少种选法?还有k个素数,p1,p2,p3,...pk,结果对lcm(p1,p2,p3.....,pk)取余. 解题思路: Lucas + 中国剩余定理,注意的是中国剩余定理的时候有可能会爆long long.然后用一个快速加法就好辣. #include <cstdio> #include <cstring> #include <iostream> #inclu…

题目链接: Hdu 5439 Aggregated Counting 题目描述: 刚开始给一个1,序列a是由a[i]个i组成,最后1就变成了1,2,2,3,3,4,4,4,5,5,5.......,最后问a[i]出现n次(i最大)时候,i最后一次出现的下标是多少? 解题思路: 问题可以转化为求a[i] == n (i最大),数列前i项的和为多少. index: 1 2 3 4 5 6 7 8 9 10 a:        1 2 2 3 3 4 4 4 5 5 可以观察出:ans[1] = 1,…

题目链接: Hdu  5445 Food Problem 题目描述: 有n种甜点,每种都有三个属性(能量,空间,数目),有m辆卡车,每种都有是三个属性(空间,花费,数目).问至少运输p能量的甜点,花费最小是多少? 解题思路: 明显可以看出是多重背包搞两次,但是数据范围太大了,背包要到2*1e6,感觉会TLe.还是呆呆的写了一发,果断超啊!然后滚回去看背包九讲课件了,看到了二进制压缩的时候,感觉可以搞这个题目.试了一下果然AC,原本物品数目是100*100,二进制压缩以后也就是100*log210…

很坑的一道题,读了半天才读懂题,手忙脚乱的写完(套上模板+修改模板),然后RE到死…… 题意: 题面上告诉了我们这是一棵二叉树,然后告诉了我们它的先序遍历,然后,没了……没了! 反复读题,终于在偶然间注意到了这一句——"Not only that, when numbering the rooms, they always number the room number from the east-most position to the west." 它告诉我们,东边的点总是比西边的点…

Problem Description Princess Alisha invites her friends to come to her birthday party. Each of her friends will bring a gift of some value v, and all of them will come at a different time. Because the lobby is not large enough, Alisha can only let a…

Elven Postman Elves are very peculiar creatures. As we all know, they can live for a very long time and their magical prowess are not something to be taken lightly. Also, they live on trees. However, there is something about them you may not know. Al…

Weak Pair Problem Description   You are given a rooted tree of N nodes, labeled from 1 to N. To the ith node a non-negative value ai is assigned.An ordered pair of nodes (u,v) is said to be weak if  (1) u is an ancestor of v (Note: In this problem a…

找了很久的规律,只看十进制数字,各种乱七八糟的规律=没规律!看了别人的解题报告,虽然看懂了,可是怎么发现的这个规律呢T.T~想了很久很久~ 以下是转载的别人的图,自己再画太麻烦了~全部看出0~2n-1-1,下标从0开始!!! 每次洗牌的时候,奇数在后偶数在前时,只需循环右移一下,如下:0(000) -->0(000) -->0(000) -->0(000)1(001) -->4(100) -->2(010) -->1(001)2(010) -->1(001) --…

1001 Alisha’s Party 比赛的时候学长stl吃T.手写堆过. 赛后我贴了那两份代码都过.相差.2s. 于是用stl写水果. # include <iostream> # include <cstdio> # include <algorithm> # include <queue> using namespace std; # define maxk int ans[maxk]; struct node { ]; int id,val; fr…

Elven Postman Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 0    Accepted Submission(s): 0 Problem Description Elves are very peculiar creatures. As we all know, they can live for a very lon…

Travel Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 46    Accepted Submission(s): 20 Problem Description Jack likes to travel around the world, but he doesn’t like to wait. Now, he is trave…

Ponds Time Limit: 1500/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 0    Accepted Submission(s): 0 Problem Description Betty owns a lot of ponds, some of them are connected with other ponds by pipes, and th…

Friends and Enemies Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 291    Accepted Submission(s): 160 Problem Description On an isolated island, lived some dwarves. A king (not a dwarf) ruled t…

Barricade Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 997    Accepted Submission(s): 306 Problem Description The empire is under attack again. The general of empire is planning to defend his…

Function Time Limit: 7000/3500 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 976    Accepted Submission(s): 375 Problem Description The shorter, the simpler. With this problem, you should be convinced of this tru…

Football Games Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 802    Accepted Submission(s): 309 Problem Description A mysterious country will hold a football world championships---Abnormal Cup…

Sparse Graph Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 689    Accepted Submission(s): 238 Problem Description In graph theory, the complement of a graph G is a graph H on the same vertic…

HDU 4291 A Short problem(2012 ACM/ICPC Asia Regional Chengdu Online) 题目链接http://acm.hdu.edu.cn/showproblem.php?pid=4291 Description 给一个式子求结果.类似Fibonacci的公式g(n)=3*g(n-1)+g[n-2]. Input 给你n(1<=n<=1e18) Output 求g(g(g(n))) Sample Input 样例第一个就是0什么鬼,虽然没影响.…

Mart Master II Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 675    Accepted Submission(s): 237 Problem Description Trader Dogy lives in city S, which consists of n districts. There are n - 1…

hannnnah_j’s Biological Test Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 802    Accepted Submission(s): 269 Problem Description hannnnah_j is a teacher in WL High school who teaches biolog…

QSC and Master Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 859    Accepted Submission(s): 325 Problem Description Every school has some legends, Northeastern University is the same. Enter…

odd-even number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 388    Accepted Submission(s): 212 Problem Description For a number,if the length of continuous odd digits is even and the length…