Description
People in Silverland use coins.They have coins of value A1,A2,A3…An Silverland dollar.One day Tony opened his money-box and found there were some coins.He decided to buy a very nice watch in a nearby shop. He wanted to pay the exact price(without change) and he known the price would not more than m.But he didn’t know the exact price of the watch.
You are to write a program which reads n,m,A1,A2,A3…An and C1,C2,C3…Cn corresponding to the number of Tony’s coins of value A1,A2,A3…An then calculate how many prices(form 1 to m) Tony can pay use these coins.
Input
The input contains several test cases. The first line of each test case contains two integers n(1<=n<=100),m(m<=100000).The second line contains 2n integers, denoting A1,A2,A3…An,C1,C2,C3…Cn (1<=Ai<=100000,1<=Ci<=1000). The last test case is followed by two zeros.
Output
For each test case output the answer on a single line.
Sample Input
3 10
1 2 4 2 1 1
2 5
1 4 2 1
0 0
Sample Output
8
4
题意:
tony有n中硬币想去买一个手表面值分别为A1,A2,An个数分别为C1,C2,Cn。知道手表价格可能的最大值m,但不知道准确值,Tony不喜欢找零。问他的钱能组合出多少种(不超过m)的钱数。
tip:
可行性的多重背包问题,但是正常写法会超时。。所以采用单调队列优化,优化的原理就是当我么的值是1时,转化成为一个01背包,当这个num*v大于总体的m时,很显然是个完全背包,理由是,可以无限的取,直到你背包塞不下为止,剩下的可能,就是多重背包了,
http://blog.youkuaiyun.com/flyinghearts/article/details/5898183
讲解多重背包很好的文章QAQ
针对这道题。。。要的不是最大值,而是