题意就是说问有多少个区间,其中有至少一种种类的宝珠出现的次数恰好为x次.            先预处理出每一个位置的宝珠下一个出现与其同种类的宝珠位置next和上一个出现与其同种类的位置pre        考虑在第i个位置的宝珠,要使其出现恰好x次,我们可以找到在i之后恰好出现了x次的位置j,这步操作可以用一定的技巧优化到O(1),那么对于区间[l,r],l∈[pre[i],i],r∈[j,next[j]],都满足题目要求的答案.        如何统计呢,可以把每次可行的区间看作一个矩形,…

Jewelry Exhibition 时间限制: 1 Sec  内存限制: 64 MB提交: 3  解决: 3[提交][状态][讨论版] 题目描述 To guard the art jewelry exhibition at night, the security agency has decided to use a new laser beam system, consisting of sender-receiver pairs. Each pair generates a strip o…

n种珠宝.每种各1个.有价格ci元,美度vi.  要求分别输出1元到m元 可买的最大优美度. 整数 :0<n<=10000000, 0<ci<=300,0<=vi<=10^9, 0<m<=50000; 之前 系统的看过有关背包的题目..然而这个做法还没见过. 首先复杂度是 300*m*log(m)+n 对1~300的每个价格 x, 按v从大到小排序,形成一个b数组.记录了价格为x的vi的前缀和(这里记为bj,   b[j]=b[j-1]+vi(当然.若j*x…

Problem G Jewelry Exhibition To guard the art jewelry exhibition at night, the security agency has decided to use a new laser beam system, consisting of sender-receiver pairs. Each pair generates a strip of light of one unit width and guards all obje…

矩形面积并. 需要转化一下思路:记录每一个位置的数以及位置. 对数字进行从小到大排序,数字一样的按位置从小到大排. 这样,一样的数就在一起了.连续的相同的x个数就可以构成很多解,这些解对应于二维平面上某矩形内整点个数(包括边界). 这样就处理出很多很多的矩形,因为重复只能计算一次,所以可以采用矩形面积并计算. PS:计算整点个数的话,可以讲每一个矩形的左下角左边-1 -1,这样就直接当面积来算就可以了. #include <cstdio> #include <cstring> #i…

题目链接:https://vjudge.net/problem/CSU-1531 Input Output Sample Input 2 1 5 3 0.2 1.5 0.3 4.8 0.4 3.5 4 4 8 0.7 0.5 1.7 0.5 2.8 1.5 3.7 0.5 2.2 3.6 2.7 2.7 1.2 2.2 1.2 2.7 Sample Output 1 3 题解: 一开始想用DP做,后来发现不行,因为新加入的点会破坏前面的结果,且不知道前面的状态如何,所以不能用动态规划的思想去解题…

March 26, 2013 作者:Hawstein 出处:http://hawstein.com/posts/dp-novice-to-advanced.html 声明:本文采用以下协议进行授权: 自由转载-非商用-非衍生-保持署名|Creative Commons BY-NC-ND 3.0 ,转载请注明作者及出处. 前言 本文翻译自TopCoder上的一篇文章: Dynamic Programming: From novice to advanced ,并非严格逐字逐句翻译,其中加入了自己的…

http://blog.csdn.net/ldghd/article/details/9632455 *****************************      一      ************************** AssetBundle incompatibility 1   I just started receiving the following error: The asset bundle 'http://***.unity3d' couldn't be lo…

(link to hollisterco site), It's a major try. After a photographer's viewpoint, Which roughly splendid. By the way, Do not begin learning our sentence structure tirades lower than, You will definately get taken and to your neverending vortex of predo…

题目描述 Every year,prince prepares a birthday gift for princess.The gift is a box,which is decorated with jewel.As princess grows older,the level of the jewelry box  gradually increase from A to Y.Every level N jewelry box will be packed in level (N-1)…