题目传送门. 题意简述:有 \(n\) 个数 \(a_1,a_2,\cdots a_n\),等概率选取区间 \(P_1,S_1\subseteq [1,n]\),\(P_2\subseteq P_1\),\(S_2\subseteq S_1\).定义 \(f(X,Y)\) 为互不相同的 \(a_i\ (i\in X,a_i\in Y)\) 的个数,求 \(\Delta=F(P_1,S_1)-F(P_2,S_2)\) 的等权重平均,即所有可能方案的 \(\Delta\) 之和除以方案总数. \(1…

    今年双十一淘宝推出了虚拟现实VR购物"BUY+",用户可以在虚拟环境中选购商品.那作为竞争对手的京东将使出什么绝招呢?在近日上海举办的谷歌开发者大会上得到了答案.会上京东推出了一款基于谷歌Tangao技术开发的国内首款AR购物应用.       这款名为JD Dream的AR应用吸引了无数人的目光,来自谷歌的工程师现场演示了JD Dream中AR购物的功能.目前这部分功能针对于家居家装,用户可挑选该场馆中的虚拟家居产品,并在手机上看到真实空间中1:1的摆放效果.用户可移动和旋转…

状压DP Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series' (where he had to use his toilet paper to draw on, for all of his paper was filled with squares…

反复听着Dream It Possible,想起自己的华为岁月,百感交集!…

Mondriaan's Dream Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 13519   Accepted: 7876 Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series…

http://www.ximalaya.com/#/17209107/sound/6883165 Dreaming. Do you or don’t you? Do you dream about the future or just have a fantasy(白日梦,幻想) dream after a couple of late night tacos(炸玉米饼)? Dreams get us going. Dreams direct(管理:指挥) our lives, our focu…

状压DP Mondriaan's Dream Time Limit: 3000MS Memory Limit: 65536K Total Submissions: 9938 Accepted: 5750 Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series…

Arc of Dream Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 419    Accepted Submission(s): 148 Problem Description An Arc of Dream is a curve defined by following function:wherea0 = A0ai = ai-1…

题目网址:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=110044#problem/A Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series' (where he had to use his…

Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series' (where he had to use his toilet paper to draw on, for all of his paper was filled with squares and r…