POJ 1795 DNA Laboratory（状压DP）

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POJ 1795 DNA Laboratory (贪心+状压DP)

题意:给定 n 个字符串,让你构造出一个最短,字典序最小的字符串,包括这 n 个字符串. 析:首先使用状压DP,是很容易看出来的,dp[s][i] 表示已经满足 s 集合的字符串以第 i 个字符串结尾,他很容易就求得最短长度,但是这个字符串怎么构造呢, 由于要字典序最小,所以就不好搞了,挺麻烦的,所以我们利用贪心的思路,我们可以这样定义,dp[s][i] 表示已经满足 s 集合的字符串以第 i 个字符串开头, 从后向前放,状态转移方程为:dp[s|(1<<i)][i] = min{ dp…

poj 1795 DNA Laboratory

DNA Laboratory Time Limit: 5000MS Memory Limit: 30000K Total Submissions: 2892 Accepted: 516 Description Background Having started to build his own DNA lab just recently, the evil doctor Frankenstein is not quite up to date yet. He wants to extra…

POJ 3254 Corn Fields (状压dp)

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…

POJ 3254 - Corn Fields - [状压DP水题]

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…

[ An Ac a Day ^_^ ] POJ 3254 Corn Fields 状压dp

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~) /* *************************…

poj 3254Corn Fields (入门状压dp)

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…