Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can afford to hire only one driver to do the deliveries. He will wait for 1 or more (up to 10) orders to be…

这道题就是Tsp问题,稍微加了些改变 注意以下问题 (1)每个点可以经过多次,这里就可以用弗洛伊德初始化最短距离 (2)在循环中集合可以用S表示更清晰一些 (3)第一维为状态,第二维为在哪个点,不要写混. (4)在dp过程中0这个点是不用的,只用到1到n这个点 而实际上dp过程中用的是0到n-1,所以就枚举1到n,然后涉及到集合的地方就写i-1 其他地方如dp的第二维,距离这些都不变. 还有一个方法,是我一开始想的方法,就是在输入的时候就把0放到第n个点,其他下标-1 (4)这道题求最小值,一定…

简单的状压动归 #include<cstdio> #include<algorithm> using namespace std; const int N=17; const long long INF=10000000+233; long long dp[1<<N][N],dis[N][N]; int times(int s){ int cnt=0; for(int k=0;(1<<k)<=s;++k)if(s&(1<<k))++…

floyd,旅游问题每个点都要到,可重复,最后回来,dp http://poj.org/problem?id=3311 Hie with the Pie Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4013   Accepted: 2132 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fas…

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][…

Hie with the Pie Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4671   Accepted: 2471 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can affo…

Hie with the Pie Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 4491   Accepted: 2376 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can affo…

Hie with the Pie Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 11243   Accepted: 5963 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can aff…

题目链接:http://poj.org/problem?id=3311 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can afford to hire only one driver to do the deliveries. He will wait fo…

主题连接:  id=3311">http://poj.org/problem?id=3311 题目大意:有n+1个点,给出点0~n的每两个点之间的距离,求这个图上TSP问题的最小解 思路:用二进制数来表示訪问过的城市集合.f[{S}][j]=已经訪问过的城市集合为S,訪问了j个城市.所需的最少花费. 这里提一下二进制数表示集合的方法(这里最好还是设集合中最多有n个元素): 假设集合S中最多会出现n个元素,则用长度为n的二进制数来表示集合S,每一位代表一个元素.该位为0表示该元素在集合S…