Mondriaan's Dream Problem 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…

Mondriaan's Dream Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 15295   Accepted: 8820 Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings in his 'toilet series…

Description Squares and rectangles fascinated the famous Dutch painter Piet Mondriaan. One night, after producing the drawings and height in varying ways. Expert as he was in this material, he saw at a glance that he'll need a computer to calculate t…

题意:略. 思路:这一题开始做的时候完全没有思路,便去看了别人的题解. 首先,对于这个题目解法想有一个初步的了解,请看这里:http://www.2cto.com/kf/201208/146894.html 根据这篇讲解,写了一篇扭曲的代码,提交之后TLE. 经过排查分析之后发现,算法的复杂度为O(hw*(2^(2w))),这个复杂度肯定超了.后来进行了优化,如果两种状态可以匹配,就将它们用邻接表(vector实现)存储起来,这样只需一遍预处理,以后直接读取就可以了. 此外,还有两个地方的优化:…

题目链接:http://poj.org/problem?id=3311 题目大意:一个送披萨的,每次送外卖不超过10个地方,给你这些地方之间的时间,求送完外卖回到店里的总时间最小. Sample Input 3 0 1 10 10 1 0 1 2 10 1 0 10 10 2 10 0 0 Sample Output 8 分析:dp[i][j]:表示在i状态(用二进制表示城市有没有经过)时最后到达j城市的最小时间,转移方程:dp[i][j]=min(dp[i][k]+d[k][j],dp[i][…

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=4257 题目大意:有 n(2<=n<=10) 个原子,每两个原子(假设为i.j)碰撞会导致一个原子(假设为 j)消失,并产生巨大的能量(假设为 A[i][j]),现在给你所有的 A[i][j],问能够产生的最大能量是多少 Sample Input 20 41 030 20 112 0 11 10 00 Sample Output 422 分析:假设一个数,第i位表示…

题意:有N(1<=N<=20)张卡片,每包中含有这些卡片的概率,每包至多一张卡片,可能没有卡片.求需要买多少包才能拿到所以的N张卡片,求次数的期望. 析:期望DP,是很容易看出来的,然后由于得到每张卡片的状态不知道,所以用状态压缩,dp[i] 表示这个状态时,要全部收齐卡片的期望. 由于有可能是什么也没有,所以我们要特殊判断一下.然后就和剩下的就简单了. 另一个方法就是状态压缩+容斥,同样每个状态表示收集的状态,由于每张卡都是独立,所以,每个卡片的期望就是1.0/p,然后要做的就是要去重,既然…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1074 题目大意:学生要完成各科作业, 给出各科老师给出交作业的期限和学生完成该科所需时间, 如果逾期一天则扣掉一单位学分, 要你求出完成所有作业而被扣最小的学分, 并将完成作业的顺序输出. Sample Input 2 3 Computer 3 3 English 20 1 Math 3 2 3 Computer 3 3 English 6 3 Math 6 3   Sample Output 2…

XHXJ's LIS Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2265    Accepted Submission(s): 927 Problem Description #define xhxj (Xin Hang senior sister(学姐)) If you do not know xhxj, then careful…

Mondriaan's Dream Time Limit: 20000/10000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 783    Accepted Submission(s): 506 Problem Description Squares and rectangles fascinated the famous Dutch painter Piet Mondri…