题意:平面上有 n (2 ≤ n ≤ 15) 个点,现用平行于坐标轴的矩形去覆盖所有点,每个矩形至少盖两个点,矩形面积不可为0,求这些矩形的最小面积. 析:先预处理所有的矩形,然后dp[s] 表示 状态 s 时,最少需要的面积是多少. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstd…

Description n points are given on the Cartesian plane. Now you have to use some rectangles whose sides are parallel to the axes to cover them. Every point must be covered. And a point can be covered by several rectangles. Each rectangle should cover…

题目链接:http://poj.org/problem?id=3254 Time Limit: 2000MS Memory Limit: 65536K Description Farmer John has purchased a lush new rectangular pasture composed of M by N (1 ≤ M ≤ 12; 1 ≤ N ≤ 12) square parcels. He wants to grow some yummy corn for the cows…

题目链接:http://poj.org/problem?id=3254 给你n*m的菜地,其中1是可以种菜的,而菜与菜之间不能相邻.问有多少种情况. 状压dp入门题,将可以种菜的状态用一个数的二进制表示.第i行的状态只与上一行有关. 此blog讲的很清楚:传送门 //#pragma comment(linker, "/STACK:102400000, 102400000") #include <algorithm> #include <iostream> #in…

Farmer John has purchased a lush ≤ M ≤ ; ≤ N ≤ ) square parcels. He wants to grow some yummy corn for the cows on a number of squares. Regrettably, some of the squares are infertile and can't be planted. Canny FJ knows that the cows dislike eating cl…

描述 Farmer John has purchased a lush new rectangular pasture composed of M by N (1 ≤ M ≤ 12; 1 ≤ N ≤ 12) square parcels. He wants to grow some yummy corn for the cows on a number of squares. Regrettably, some of the squares are infertile and can't be…

题意: 有一块n*m的土地 0代表不肥沃不可以放牛 1代表肥沃可以放牛 且相邻的草地不能同时放牛 问最多有多少种放牛的方法并对1e8取模 思路: 典型的状压dp 能状态压缩 能状态转移 能状态压缩的题的特点就是只有两种状态 所以用0 1表示两种状态 用位运算判断是否符合条件 然后将前一行的合理状态转移到后一行 最后统计最后一行的状态 dp[i][j]代表第i行以第j种状态放牛时有多少种不同的状态 (c++的语言特性是 封装 继承 多态~) /* *************************…

题意:有2辆车运货,每次同时出发,n(<10),各自装货容量c1 c2,问最少运几次运完. 思路:n比较小,打表打出所有能运的组合方式,用背包求出是否能一次运走.然后状压DP运的顺序. 代码: #include<set> #include<map> #include<cmath> #include<queue> #include<cstdio> #include<vector> #include<cstring> #…

Rectangular Covering Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 2776   Accepted: 790 Description n points are given on the Cartesian plane. Now you have to use some rectangles whose sides are parallel to the axes to cover them. Ever…

[题目链接] http://poj.org/problem?id=2836 [题目大意] 给出二维平面的一些点,现在用一些非零矩阵把它们都包起来, 要求这些矩阵的面积和最小,求这个面积和 [题解] 我们计算出以每两个点为矩形顶点所构成的矩形面积和包含的点子集, 然后对这些子集进行状态DP,求全集的最小覆盖 [代码] #include <cstdio> #include <algorithm> #include <vector> #include <cstring&…